Class: beta-Adrenergic Blocking Agents
VA Class: CV100
Chemical Name: 2-Hydroxy-5-[1-hydroxy-2-[(1-methyl-3-phenylpropyl)amino]ethyl]benzamide monohydrochloride
Molecular Formula: C19H24N2O3•HCl
CAS Number: 32780-64-6
Medically reviewed by Drugs.com. Last updated on Feb 25, 2019.
Introduction
Selective α1- and nonselective β-adrenergic blocking agent (β-blocker).1 2 3 4 5 6 7 8 9 19 21 22 23 32
Uses for Labetalol
Hypertension
Management of hypertension, alone or in combination with other classes of antihypertensive agents.2 4 253 1200
β-Blockers generally not preferred for first-line therapy of hypertension according to current evidence-based hypertension guidelines, but may be considered in patients who have a compelling indication (e.g., prior MI, ischemic heart disease, heart failure) for their use or as add-on therapy in those who do not respond adequately to the preferred drug classes (ACE inhibitors, angiotensin II receptor antagonists, calcium-channel blockers, or thiazide diuretics).337 501 502 503 504 515 523 524 527 700 1200 A 2017 ACC/AHA multidisciplinary hypertension guideline states that β-blockers used for ischemic heart disease that are also effective in lowering BP include bisoprolol, carvedilol, metoprolol succinate, metoprolol tartrate, nadolol, propranolol, and timolol.1200
Individualize choice of therapy; consider patient characteristics (e.g., age, ethnicity/race, comorbidities, cardiovascular risk) as well as drug-related factors (e.g., ease of administration, availability, adverse effects, cost).501 502 503 504 515 1200 1201
The 2017 ACC/AHA hypertension guideline classifies BP in adults into 4 categories: normal, elevated, stage 1 hypertension, and stage 2 hypertension.1200 (See Table 1.)
Source: Whelton PK, Carey RM, Aronow WS et al. 2017 ACC/AHA/AAPA/ABC/ACPM/AGS/APhA/ASH/ASPC/NMA/PCNA guideline for the prevention, detection, evaluation, and management of high blood pressure in adults: a report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines. Hypertension. 2018;71:e13-115.
Individuals with SBP and DBP in 2 different categories (e.g., elevated SBP and normal DBP) should be designated as being in the higher BP category (i.e., elevated BP).
Category |
SBP (mm Hg) |
DBP (mm Hg) |
|
---|---|---|---|
Normal |
<120 |
and |
<80 |
Elevated |
120–129 |
and |
<80 |
Hypertension, Stage 1 |
130–139 |
or |
80–89 |
Hypertension, Stage 2 |
≥140 |
or |
≥90 |
The goal of hypertension management and prevention is to achieve and maintain optimal control of BP.1200 However, the BP thresholds used to define hypertension, the optimum BP threshold at which to initiate antihypertensive drug therapy, and the ideal target BP values remain controversial.501 503 504 505 506 507 508 515 523 526 530 1200 1201 1207 1209 1222 1223 1229
The 2017 ACC/AHA hypertension guideline generally recommends a target BP goal (i.e., BP to achieve with drug therapy and/or nonpharmacologic intervention) <130/80 mm Hg in all adults regardless of comorbidities or level of atherosclerotic cardiovascular disease (ASCVD) risk.1200 In addition, an SBP goal of <130 mm Hg generally is recommended for noninstitutionalized ambulatory patients ≥65 years of age with an average SBP of ≥130 mm Hg.1200 These BP goals are based upon clinical studies demonstrating continuing reduction of cardiovascular risk at progressively lower levels of SBP.1200 1202 1210
Other hypertension guidelines generally have based target BP goals on age and comorbidities.501 504 536 Guidelines such as those issued by the JNC 8 expert panel generally have targeted a BP goal of <140/90 mm Hg regardless of cardiovascular risk and have used higher BP thresholds and target BPs in elderly patients501 504 compared with those recommended by the 2017 ACC/AHA hypertension guideline.1200
Some clinicians continue to support previous target BPs recommended by JNC 8 due to concerns about the lack of generalizability of data from some clinical trials (e.g., SPRINT study) used to support the 2017 ACC/AHA hypertension guideline and potential harms (e.g., adverse drug effects, costs of therapy) versus benefits of BP lowering in patients at lower risk of cardiovascular disease.1222 1223 1224 1229
Consider potential benefits of hypertension management and drug cost, adverse effects, and risks associated with the use of multiple antihypertensive drugs when deciding a patient's BP treatment goal.1200 1220
For decisions regarding when to initiate drug therapy (BP threshold), the 2017 ACC/AHA hypertension guideline incorporates underlying cardiovascular risk factors.1200 1207 ASCVD risk assessment is recommended by ACC/AHA for all adults with hypertension.1200
ACC/AHA currently recommend initiation of antihypertensive drug therapy in addition to lifestyle/behavioral modifications at an SBP ≥140 mm Hg or DBP ≥90 mm Hg in adults who have no history of cardiovascular disease (i.e., primary prevention) and a low ASCVD risk (10-year risk <10%).1200
For secondary prevention in adults with known cardiovascular disease or for primary prevention in those at higher risk for ASCVD (10-year risk ≥10%), ACC/AHA recommend initiation of antihypertensive drug therapy at an average SBP ≥130 mm Hg or an average DBP ≥80 mm Hg.1200
Adults with hypertension and diabetes mellitus, chronic kidney disease (CKD), or age ≥65 years are assumed to be at high risk for cardiovascular disease; ACC/AHA state that such patients should have antihypertensive drug therapy initiated at a BP ≥130/80 mm Hg.1200 Individualize drug therapy in patients with hypertension and underlying cardiovascular or other risk factors.502 1200
In stage 1 hypertension, experts state that it is reasonable to initiate drug therapy using the stepped-care approach in which one drug is initiated and titrated and other drugs are added sequentially to achieve the target BP.1200 Initiation of antihypertensive therapy with 2 first-line agents from different pharmacologic classes recommended in adults with stage 2 hypertension and average BP >20/10 mm Hg above BP goal.1200
Black hypertensive patients generally tend to respond better to monotherapy with calcium-channel blockers or thiazide diuretics than to β-blockers.327 334 335 501 504 1200 However, diminished response to β-blockers is largely eliminated when administered concomitantly with a thiazide diuretic.500
Recommended by ACOG and other experts as an appropriate drug of choice in pregnant women who require antihypertensive therapy.298 502 540
Severe Hypertension and Hypertensive Crisis
Used parenterally for immediate BP reduction in severe hypertension or hypertensive emergency;1 3 7 8 14 15 16 51 52 53 73 79 93 94 152 197 198 209 210 235 236 240 502 542 1200 generally suitable for most hypertensive emergencies except when acute cardiac failure is present.239 1200
One of several recommended parenteral agents for use in the hospital setting to urgently lower BP in severely hypertensive pregnant women, including those with preeclampsia† or eclampsia†.298 338 540 1200
Has been used for rapid reduction of BP in children and adolescents† with acute severe hypertension† and life-threatening symptoms.1150
Pheochromocytoma
Has been used alone in patients with pheochromocytoma to control hypertension and symptoms resulting from excessive β-receptor stimulation.51 85 181 182 183 184 However, some clinicians caution against use unless pretreatment with α-adrenergic blocking agents (e.g., IV phentolamine) has occurred.7 May be more effective when tumors predominantly secrete epinephrine rather than norepinephrine, and with sustained rather than paroxysmal hypertension.85 (See Pheochromocytoma under Cautions.)
Controlled Hypotension during Anesthesia
Treatment to produce controlled hypotension during anesthesia† to reduce bleeding resulting from surgical procedures.7 183 190 191 192 193 194 195
Chronic Stable Angina
Long-term management of chronic stable angina pectoris†.7 17 18 127
β-Blockers are recommended as first-line anti-ischemic drugs in most patients with chronic stable angina; despite differences in cardioselectivity, intrinsic sympathomimetic activity, and other clinical factors, all β-blockers appear to be equally effective for this use.1101
Tetanus
Management of sympathetic overactivity syndrome associated with severe tetanus†.196 200 201 202
Labetalol Dosage and Administration
General
-
If long-term therapy is discontinued, gradually reduce dosage over a period of 1–2 weeks.2 4 293 (See Abrupt Withdrawal of Therapy under Cautions.)
BP Monitoring and Treatment Goals
-
Monitor BP regularly (i.e., monthly) during therapy and adjust dosage of the antihypertensive drug until BP controlled.1200
-
If unacceptable adverse effects occur, discontinue drug and initiate another antihypertensive agent from a different pharmacologic class.1216
-
If adequate BP response not achieved with a single antihypertensive agent, either increase dosage of single drug or add a second drug with demonstrated benefit and preferably a complementary mechanism of action (e.g., ACE inhibitor, angiotensin II receptor antagonist, calcium-channel blocker, thiazide diuretic).1200 1216 Many patients will require ≥2 drugs from different pharmacologic classes to achieve BP goal; if goal BP still not achieved, add a third drug.1200 1216
Severe Hypertension and Hypertensive Crisis
-
Adjust dosage according to the severity of hypertension and the patient’s supine BP response and tolerance.600
-
Initial goal of IV therapy in adults without a compelling indication is to reduce SBP by ≤25% within 1 hour, followed by further BP reduction if stable to 160/100 or 160/110 mm Hg within the next 2–6 hours; avoid excessive declines in pressure that could precipitate renal, cerebral, or coronary ischemia.542 1200 If this BP is well tolerated and the patient is clinically stable, may implement further gradual reductions toward normal BP in the next 24–48 hours.1200
-
Adults with severe preeclampsia or eclampsia or pheochromocytoma crisis: Reduce SBP to <140 mm Hg during the first hour.1200
-
Adults with aortic dissection: Reduce SBP to <120 mm Hg within the first 20 minutes.1200
-
Children and adolescents: Some experts suggest reducing BP by ≤25% of the planned reduction over the first 8 hours.1150
Administration
Administer orally,2 4 7 8 19 23 47 49 by direct IV injection, or by continuous IV infusion.1 3 7 19 23 51 52 53 73 79 93 94 210
Oral Administration
Usually administered in 2 divided doses daily.2 4 If adverse effects (e.g., nausea, dizziness) occur and are intolerable (particularly with dosages ≥1.2 g daily), administration in 3 divided doses daily may improve patient tolerance and/or facilitate dosage titration.2 4
IV Administration
For solution and drug compatibility information, see Compatibility under Stability.
Administer by slow, direct IV injection or by slow, continuous IV infusion.1 3 7 19 23 51 52 53 73 79 93 94 210
Labetalol injection is intended for use in hospitalized patients.1
Patients must be kept in a supine position during and for 3 hours after IV administration since symptomatic orthostatic hypotension is likely to occur if patients are tilted upward or allowed to assume an upright position.1 3 (See Hypotension under Cautions.)
Dilution
For IV infusion, dilute labetalol injection to an appropriate concentration in a compatible IV infusion solution (e.g., add 200 mg of the drug to 160 mL of 5% dextrose injection to provide a solution containing 1 mg/mL).1 3
Rate of Administration
Administer repeat doses by slow, direct IV injection over a 2-minute period at intervals of 10 minutes.1 3 53 73 79 94 298 1200
Administer diluted solutions by slow, continuous IV infusion1 3 51 73 210 with a controlled-infusion device to facilitate a desired rate of infusion.1 3
Dosage
Available as labetalol hydrochloride; dosage expressed in terms of the salt.
Pediatric Patients
Hypertension†
Oral
Some experts have recommended an initial dosage of 1–3 mg/kg daily given in 2 divided doses.333 Increase dosage as necessary up to a maximum of 10–12 mg/kg or 1.2 g daily given in 2 divided doses.333
Severe Hypertension†
Rapid Reduction of BP†
IV InjectionChildren and adolescents: 0.2–1 mg/kg up to maximum of 40 mg per dose by direct IV injection.1150
IV InfusionAlternatively, 0.25–3 mg/kg per hour by continuous IV infusion.1150
Adults
Hypertension
Oral
Initially, 100 mg twice daily, either alone or in combination with a diuretic.2 4 293
Adjust dosage in increments of 100 mg twice daily every 2 or 3 days until optimum BP response is achieved.2 4
For maintenance, manufacturers recommend a usual dosage of 200–400 mg twice daily.2 4 Manufacturers state that some adults with severe hypertension may require up to 1.2–2.4 g daily in 2 or 3 divided doses.2 4 a
Some experts recommend a usual range of 100–400 mg twice daily.1200 Rationale for lower dosage range is that it may be preferable to add another drug rather than continue to increase dosage.332
Adjustment of labetalol dosage may be necessary when diuretic is initiated in a patient already receiving labetalol; optimum maintenance dosage is usually lower.2 4
When transferring from other antihypertensive agents, start with usual initial labetalol dosage and gradually decrease dosage of the existing regimen.2 4
Severe Hypertension and Hypertensive Crisis
IV Injection
Manufacturer recommends initial dose of 20 mg by slow (over 2 minutes), direct IV injection.600 Alternatively, some experts recommend initial dosage of 0.3–1 mg/kg (maximum 20 mg) by slow, direct IV injection every 10 minutes.1200
Higher initial doses (e.g., 1–2 mg/kg) have been administered,51 55 235 but the 20-mg dose is recommended to minimize adverse effects and the risks associated with too rapid reduction in BP.23 53 79
May give additional doses of 40 or 80 mg600 at 10-minute intervals until the desired supine BP is achieved or up to a total cumulative dose of 300 mg.7 19 53 73 79 94 274 298 600
IV Infusion
As an alternative to direct IV injection, manufacturer recommends initial rate of 2 mg/minute by continuous IV infusion; adjust rate according to the BP response.600
Some experts recommend initial IV infusion rate of 0.4–1 mg/kg per hour; increase rate as needed up to 3 mg/kg per hour.1200
The usual effective, cumulative dose is 50–200 mg; up to 300 mg may be required.600 1200
Progressive, incremental IV infusion regimen† (i.e., infusing 20, 40, 80, and 160 mg/hour for 1 hour at each dose level, or until the desired BP is achieved) has been used, and may result in more gradual BP reduction, minimizing adverse effects compared with repeated IV injections of the drug.21 51 197 Controlled comparisons of various IV administration methods are not available.
Oral (following IV dosage)
Discontinue IV therapy and initiate oral labetalol therapy (with tablets) when the supine DBP begins to increase.600
Initially 200 mg, followed in 6–12 hours by an additional dose of 200 or 400 mg, depending on the BP response.600
If necessary, oral dosage may be increased in usual increments at 1-day intervals while the patient is hospitalized (dosage range: 400–2400 mg daily administered in 2 or 3 divided doses).600
Follow the usual oral dosage recommendations for subsequent outpatient dosage titration or maintenance dosing.600
Severe Hypertension During Pregnancy (e.g., Preeclampsia†)
IV Injection
Initially, 10–20 mg by direct IV injection, followed by 20–80 mg every 20–30 minutes as needed for a maximum cumulative dose of 300 mg.298
IV Infusion
As an alternative to direct IV injection, some experts recommend continuous IV infusion of 1–2 mg/minute.298
Prescribing Limits
Pediatric Patients
Hypertension
Oral
Maximum 10–12 mg/kg or 1.2 g daily.333
Severe Hypertension†
IV Injection
Children and adolescents: Maximum 40 mg per dose.1150
Adults
Hypertension
Oral
Maximum titration increment of 200 mg twice daily.a
Severe Hypertension and Hypertensive Crisis
IV
Maximum cumulative dose of 300 mg.1 3 7 19 53 73 79 94 274 298
Severe Hypertension During Pregnancy (e.g., Preeclampsia†)
IV
Maximum cumulative dose of 300 mg.298
Special Populations
Hepatic Impairment
Dosage reduction may be necessary, but specific data are currently not available.7 39
Renal Impairment
No dosage adjustment required in patients with mild to moderate renal impairment.60 146 147 239 In patients with severe renal impairment (i.e., Clcr <10 mL/minute) undergoing dialysis, once-daily dosing may be adequate.241
Geriatric Patients
Oral
Adjustment in initial dosage not required.a Maintenance dosage requirements are lower in most geriatric patients; 100–200 mg twice daily usually required.4 a 4
Cautions for Labetalol
Contraindications
-
Obstructive airway disease (e.g., bronchial asthma).1 2 3 4 311
-
Other conditions associated with severe and prolonged hypotension.1 3 4 247
-
Known hypersensitivity to labetalol or any ingredient in the formulation.1 3 4 247
Warnings/Precautions
Warnings
Hepatic Effects
Rarely, jaundice, hepatitis, severe hepatocellular injury, and elevated liver function test results have occurred; usually reversible following discontinuance,1 2 3 4 247 248 however, hepatic necrosis and death have been reported.1 2 3 4 247 248 254 255 275 276
Discontinue immediately if jaundice or laboratory evidence of hepatic injury occurs.1 2 3 4 247 248
Perform liver function tests at the first signs or symptoms of liver dysfunction (e.g., pruritus, dark urine, persistent anorexia, jaundice, right upper quadrant tenderness, flu-like syndrome).1 2 3 4 247 248
Cardiac Failure
Possible precipitation of heart failure.1 2 3 4 7 Use contraindicated in patients with overt heart failure;1 2 3 4 may use cautiously in patients with well-compensated heart failure (e.g., those controlled with cardiac glycosides and/or diuretics).1 2 3 4 Use with caution in patients with inadequate cardiac function.1 2 3 4 7
Adequate treatment (e.g., with a cardiac glycoside and/or diuretic) and close observation recommended if signs and symptoms of impending cardiac failure occur; if cardiac failure continues, discontinue therapy, gradually if possible.1 2 3 4
Abrupt Withdrawal of Therapy
Abrupt withdrawal may exacerbate angina symptoms or precipitate MI in patients with CAD.1 2 3 4 Avoid abrupt discontinuance.2 4 Gradually decrease dosage over a period of 1–2 weeks, particularly in patients with ischemic heart disease and monitor patients carefully.1 2 3 4 If exacerbation of angina occurs or acute coronary insufficiency develops, reinstitute therapy promptly, at least temporarily, and initiate appropriate measures for the management of unstable angina pectoris.1 2 3 4
Labetalol may be less likely than pure β-adrenergic blocking agents to produce adverse cardiovascular withdrawal reactions (e.g., angina, rebound hypertension) following abrupt withdrawal;9 74 75 76 77 78 164 angina pectoris has not been reported to date following discontinuance of labetalol.1 2 3 4
Bronchospastic Disease
Possible inhibition of bronchodilation produced by endogenous catecholamines; use generally not recommended in patients with bronchospastic disease.2 4
May use oral labetalol with caution in patients with nonallergic bronchospasm (e.g., chronic bronchitis, emphysema) who do not respond to or cannot tolerate other hypotensive agents;2 4 use smallest effective dose to minimize inhibition of endogenous or exogenous β-adrenergic agonist activity.2 4
Do not use IV labetalol in patients with nonallergic bronchospasm at the usual therapeutic doses; has not been studied adequately.1 3
Pheochromocytoma
Use with caution in patients with pheochromocytoma;1 2 3 4 186 187 oral labetalol may induce paradoxical hypertensive crisis.7 186 187 203 Use not recommended unless pretreatment with α-adrenergic blocking agents (e.g., IV phentolamine) has occurred.7
Employ appropriate methods for determining urinary catecholamines if used in known or suspected pheochromocytoma.1 2 3 4 (See Specific Drugs and Laboratory Tests under Interactions.)
Diabetes and Hypoglycemia
Possible decreased signs and symptoms of hypoglycemia (e.g., tachycardia, BP changes),1 2 3 4 impaired glucose tolerance, delayed rate of recovery of blood glucose concentration following drug-induced hypoglycemia, altered hemodynamic response to hypoglycemia (possibly resulting in exaggerated hypertensive response), and impaired peripheral circulation.211 212
Use with caution in patients with diabetes mellitus;1 2 3 4 dosage adjustment of the hypoglycemic agent may be necessary.1 2 3 4
Major Surgery
Severe, protracted hypotension and difficulty in restarting or maintaining a heart beat have occurred during surgery in some patients receiving β-adrenergic blocking agents;1 2 3 4 however, withdrawal of β-adrenergic blocking agent prior to major surgery is controversial.1 2 3 4
Effect of labetalol’s α-adrenergic activity in patients undergoing major surgery has not been evaluated,1 2 3 4 but several deaths have been reported with the use of the injection during surgery, including when used to control bleeding.1 3
Synergistic hypotensive response occurs with concomitant use of IV labetalol and halothane anesthesia.1 2 3 4 183 190 191 192 193 194 195 (See Specific Drugs and Laboratory Tests under Interactions.)
Severely Elevated BP
Use caution when reducing severely elevated BP.1 3
Use IV labetalol in hospitalized patients,1 3 and achieve the desired reduction over longest period of time compatible with the patient’s clinical status.1 3
Avoid rapid or excessive reductions in SBP or DBP.1 3
Serious adverse effects (e.g., cerebral infarction, optic nerve infarction, angina, and ischemic changes in the ECG)51 79 197 have been reported when severely elevated BP was reduced over several hours to up to 1 or 2 days with other hypotensive agents.311
General Precautions
Hypotension
Orthostatic hypotension associated with loss of consciousness reported occasionally following IV administration51 54 55 132 and rarely following oral administration.2 4 Symptomatic orthostatic hypotension is likely to occur if supine patients are tilted upward or allowed to assume the upright position within 3 hours following IV administration.1 3
If hypotension occurs, place the patient in Trendelenburg’s position, administer IV fluids, and/or temporarily discontinue administration of the drug.51 79 94 197
Patients should remain supine during and for up to 3 hours after IV administration.1 3 Establish patient’s ability to tolerate an upright position before any ambulation (e.g., use of toilet facilities) is permitted; advise patient on how to proceed gradually to become ambulatory and observe at the time of initial ambulation.1 3
Laboratory Tests
Monitor laboratory parameters at regular intervals in patients receiving long-term oral therapy.2 4
Routine laboratory tests are usually not required before or after IV administration.1 3
In patients with concomitant illnesses (e.g., impaired renal function), perform appropriate tests to monitor these conditions.1 2 3 4
Possible Prescribing and Dispensing Errors
Ensure accuracy of prescription; similarity in spelling of labetalol hydrochloride and Lamictal (lamotrigine, an anticonvulsant agent) has resulted in dispensing errors.319 320 Errors may be associated with serious adverse events (e.g., status epilepticus, serious lamotrigine rash) in patients receiving the wrong drug.319 320
History of Anaphylactic Reactions
Possible increased reactivity to a variety of allergens;1 patients may be less responsive to usual doses of epinephrine used to treat anaphylactic reactions.1 3 4
Other Precautions
Shares the toxic potentials of β-adrenergic and postsynaptic α1-adrenergic blocking agents;1 2 3 4 7 8 9 observe the usual precautions of these agents.1 2 3 4 7
Specific Populations
Pregnancy
Lactation
Distributed into milk.1 2 3 4 6 7 64 68 69 Caution if used in nursing women.1 2 3 4
Pediatric Use
Safety and efficacy not fully established;1 2 3 4 247 248 however, some experts have recommended dosages for hypertension based on clinical experience.1150
Geriatric Use
Orthostatic symptoms (e.g., orthostatic hypotension, dizziness, lightheadedness) are more likely in geriatric individuals than in younger adults; caution geriatric patients about the possibility of such symptoms.4
A lower maintenance dosage may be required because of reduced elimination in geriatric patients.4 (See Geriatric Patients under Dosage and Administration.)
Hepatic Impairment
Use with caution; metabolism of the drug may be decreased.1 2 3 4 7 39 247 248 (See Special Populations under Pharmacokinetics.)
Renal Impairment
Elimination half-life may be increased in patients with severe renal impairment undergoing dialysis; once-daily dosing may be possible in these patients.241 (See Renal Impairment under Dosage and Administration.)
Common Adverse Effects
Symptomatic orthostatic hypotension,1 2 3 4 7 8 9 19 23 46 51 54 55 79 81 83 88 91 94 96 100 108 122 129 132 158 159 247 248 dizziness1 2 3 4 8 23 74 75 76 79 80 81 82 88 90 158 159 or lightheadedness,23 51 53 85 fatigue,1 2 3 4 23 75 76 78 87 159 nausea,1 2 3 4 7 8 19 23 51 53 74 75 76 78 79 80 81 82 83 87 90 93 94 158 159 247 248 dyspepsia.1 2 3 4 7 8 23 74 75 76 79 82 83 93 94 158 159 247 248
Interactions for Labetalol
Specific Drugs and Laboratory Tests
Drug or Test |
Interaction |
Comments |
---|---|---|
β-Adrenergic agonists |
Greater than usual dosages of β-adrenergic agonist bronchodilators may be required1 2 3 4 |
|
Calcium-channel blocking agents (e.g., verapamil, diltiazem) |
Possible additive therapeutic256 257 258 259 260 261 262 263 264 265 267 268 269 270 271 272 273 and adverse effects257 261 264 266 267 268 271 272 273 |
Use concomitantly with caution1 3 4 247 258 259 260 261 264 266 268 271 272 273 290 291 |
Cimetidine |
Absolute bioavailability of oral labetalol substantially increased, possibly via enhanced absorption or decreased first-pass hepatic metabolism 1 2 3 4 180 229 |
Carefully adjust labetalol dosage for optimal BP control with concomitant use1 2 3 4 229 |
Diuretics |
Increased hypotensive effect 2 4 7 8 9 15 19 72 76 77 78 80 81 82 83 85 87 90 91 96 97 99 231 234 |
Usually used to therapeutic advantage; careful dosage adjustments recommended2 4 7 8 9 15 19 72 76 77 78 80 81 82 83 85 87 90 91 96 97 99 231 234 |
Glutethimide (no longer commercially available in the US) |
Absolute bioavailability of oral labetalol decreased, possibly by increasing first-pass hepatic metabolism 229 |
Carefully adjust labetalol dosage for optimal BP control with concomitant use229 |
Halothane |
Synergistic hypotensive effect; 183 190 191 192 193 194 195 may result in large reduction in cardiac output and increase in central venous pressure1 2 3 4 183 190 191 192 193 194 195 |
Adjust halothane concentration to control the degree and duration of hypotension;183 190 191 192 193 194 195 to minimize the risk of excessive hypotension, inspired halothane concentrations of ≥3% should not be used1 2 3 4 Inform anesthesiologist if labetalol therapy is continued in a patient undergoing major surgery1 2 3 4 |
Mibefradil (no longer commercially available in the US) |
Slowing or complete suppression of SA node activity, with slow ventricular rates290 291 |
|
Nitroglycerin |
Possible additive hypotensive effects1 2 3 4 and antagonism of the reflex tachycardia produced by nitroglycerin1 2 3 4 |
|
Tricyclic antidepressants |
||
Tests for urinary catecholamines |
Labetalol metabolites in urine may result in false-positive elevations of urinary free216 and total217 catecholamines, metanephrine, normetanephrine, and 3-methoxy-4-hydroxymandelic acid (vanillylmandelic acid, VMA) measured by fluorometric or photometric methods1 2 3 4 216 217 218 248 |
When screening labetalol-treated patients suspected of having pheochromocytoma or when evaluating labetalol-treated patients with the tumor, use specific assay methods such as high-performance liquid chromatography (HPLC) with solid phase extraction1 2 3 4 218 248 252 to determine concentrations of catecholamines or their metabolites1 2 3 4 216 217 218 248 |
Labetalol Pharmacokinetics
Absorption
Bioavailability
Rapidly and almost completely absorbed (i.e., 90–100%) from the GI tract following oral administration.2 4 5 6 7 8 10 34 58 59
Undergoes extensive first-pass metabolism in the liver and/or GI mucosa.2 4 5 6 7 8 10 23 33 34 35 37 41 58 Absolute bioavailability is about 25%.2 4 5 6 7 34 37
Onset
Following oral administration, hypotensive effect is generally apparent within 20 minutes to 2 hours,6 10 34 43 48 56 57 and maximal within 1–4 hours.2 4 5 6 7 34 43 48 56
Maximum, steady-state BP response with twice-daily dosing occurs within 1–3 days.2 4
Following slow, direct IV injection, hypotensive effect is apparent within 2–5 minutes,5 6 7 33 47 51 52 53 54 55 240 and usually maximal within 5–15 minutes.1 3 53 54 55 240
Duration
Dose dependent; about 8–12 or 12–24 hours after a single 200- or 300-mg dose, respectively.2 4 5 6 43 57
Following slow, direct IV injection, the hypotensive effect generally persists for about 2–4 hours,6 53 55 although a longer duration of effect (i.e., up to 24 hours) has been reported in some patients.6 33 53 55 240
Food
Delays absorption,36 but increases absolute bioavailability.2 4 5 7 10 36 37
Special Populations
Relative bioavailability is increased in hepatic impairment.a 1 2 3 4 5 10 39
First-pass metabolism may be reduced and bioavailability substantially increased in geriatric patients.7 10 38
Distribution
Extent
Following IV administration, rapidly and widely distributed into the extravascular space.5 7 10 33 34 35
In animals, highest concentrations in the lungs, liver, and kidneys;5 7 10 58 only minimal amounts cross the blood-brain barrier.1 2 3 4 5 7 10 58
Crosses the placenta;1 2 3 4 5 6 58 64 65 66 67 70 distributed into milk,1 2 3 4 5 6 7 64 68 69 principally as unbound labetalol.5
Plasma Protein Binding
Approximately 50%.1 2 3 4 5 7 10 58
Special Populations
In patients with impaired hepatic function, the apparent volume of distribution is decreased.39
Elimination
Metabolism
Following oral administration, extensively metabolized in the liver and possibly in the GI mucosa principally by conjugation with glucuronic acid,1 2 3 4 5 7 10 58 principally to O-alkylglucuronide5 and smaller amounts of O-phenylglucuronide and N-glucuronide.5 10 58
Undergoes extensive first-pass metabolism in the liver and/or GI mucosa.2 4 5 6 7 8 10 23 33 34 35 37 41 58
Elimination Route
Excreted in feces via biliary elimination (30% within 4 days) and in urine (55–60% within 24 hours), mainly as glucuronide conjugates.1 2 3 4 5 7 10 58 1 2 3 4 5 7 10 58
Less than 5% of a dose is excreted unchanged in urine.7 10 58
Half-life
Biphasic5 7 10 33 35 43 58 59 or possibly triphasic;10 33 241 terminal half-life averages 2.5–8 hours.1 2 3 4 5 7 10 33 35 37 38 39 41 43 58 60 63 Manufacturers specify half-life of 5.5 or 6–8 hours following IV or oral administration, respectively.1 2 3 4
Special Populations
Elimination may be reduced and half-life may be slightly increased in geriatric individuals.4 7 10 38
Half-life apparently unchanged in individuals with renal1 2 3 4 5 10 60 71 239 or hepatic impairment,1 2 3 4 39 but may be increased in patients with severe renal impairment (i.e., Clcr <10 mL/minute) undergoing dialysis.241
Not appreciably removed (<1% of a dose) by hemodialysis203 204 241 242 or peritoneal dialysis.203 223 241 242
Stability
Storage
Oral
Tablets
Well-closed containers20 at 2–30°C.2 4 5 6
Protect tablets in unit-dose packages from excessive moisture.2 4 5 6
Parenteral
Injection
2–30°C; protect from light and freezing.1 3 5 6
Compatibility
For information on systemic interactions resulting from concomitant use, see Interactions.
Parenteral
Solution CompatibilityHID
Compatible |
---|
Dextrose 5% in Ringer’s injection |
Dextrose 5% in Ringer’s injection, lactated |
Dextrose 2.5% in sodium chloride 0.45% |
Dextrose 5% in sodium chloride 0.2, 0.33, or 0.9% |
Dextrose 5% in water |
Polysal in dextrose 5% |
Ringer’s injection |
Ringer’s injection, lactated |
Sodium chloride 0.9% |
Incompatible |
Sodium bicarbonate 5% |
Drug Compatibility
Compatible |
---|
Amikacin sulfate |
Aminophylline |
Amiodarone HCl |
Ampicillin sodium |
Bivalirudin |
Butorphanol tartrate |
Calcium gluconate |
Cefazolin sodium |
Ceftazidime |
Chloramphenicol sodium succinate |
Clindamycin phosphate |
Clonidine HCl |
Co-trimoxazole |
Dexmedetomidine HCl |
Diltiazem HCl |
Dobutamine HCl |
Dopamine HCl |
Doripenem |
Enalaprilat |
Epinephrine HCl |
Erythromycin lactobionate |
Esmolol HCl |
Famotidine |
Fenoldopam mesylate |
Fentanyl citrate |
Gentamicin sulfate |
Hetastarch in lactated electrolyte injection (Hextend) |
Hydromorphone HCl |
Hydroxyethyl starch 130/0.4 in sodium chloride 0.9% |
Lidocaine HCl |
Linezolid |
Lorazepam |
Magnesium sulfate |
Meperidine HCl |
Metronidazole |
Micafungin sodium |
Midazolam HCl |
Milrinone lactate |
Morphine sulfate |
Nicardipine HCl |
Nitroglycerin |
Norepinephrine bitartrate |
Oxacillin sodium |
Penicillin G potassium |
Potassium chloride |
Potassium phosphates |
Propofol |
Ranitidine HCl |
Sodium acetate |
Sodium nitroprusside |
Telavancin HCl |
Tobramycin sulfate |
Vancomycin HCl |
Vecuronium bromide |
Incompatible |
Amphotericin B cholesteryl sulfate complex |
Ceftaroline fosamil |
Ceftriaxone sodium |
Furosemide |
Nafcillin sodium |
Warfarin sodium |
Variable |
Heparin sodium |
Actions
-
Competitively blocks adrenergic stimulation of β-receptors within the myocardium (β1-receptors) and within bronchial and vascular smooth muscle (β2-receptors) and α1-receptors within vascular smooth muscle.1 2 3 4 7 8 9 21 22 23 24 28 29 30 32 44
-
Has some intrinsic β2-agonist activity in animals,1 2 3 4 7 30 62 221 222 but exerts little, if any, intrinsic β1-agonist activity;1 2 3 4 7 8 9 30 62 107 does not exhibit intrinsic α-adrenergic agonist activity.7 28 30
-
Unlike pure β-adrenergic blocking agents, produces a dose-dependent (at usual doses) decrease in systemic arterial BP and systemic vascular resistance without a substantial reduction in resting heart rate, cardiac output, or stroke volume, apparently because of its combined α- and β-adrenergic blocking activity.1 2 3 4 7 112 113 114
-
Effectively reduces BP in the standing or supine position, but because of the drug’s α1-adrenergic blocking activity, the effect on BP is position dependent; labetalol-induced decreases in BP are greater in the standing than in the supine position, and orthostatic hypotension can occur.1 2 3 4 7 8 9 112 113 114 115 116 117 118 119 120 121 122 123 124
-
Electrophysiologic effects of labetalol are variable and appear to be mediated via the drug’s myocardial β1-adrenergic blocking activity.1 2 3 4 7 111 219 220
-
May decrease conduction velocity through the AV node and increase the atrial effective refractory period (ERP), but the drug appears to have inconsistent effects on SA conduction time and the AV nodal refractory period;1 2 3 4 7 111 the decrease in AV nodal conduction velocity produced by labetalol is less than that produced by pure β-adrenergic blocking agents.7
-
Generally has little effect on sinus rate, intraventricular conduction, the His-Purkinje system, or duration of the QRS complex.1 2 3 4 7 111
Advice to Patients
-
Importance of taking medication exactly as prescribed.a
-
Importance of not interrupting or discontinuing therapy without consulting clinician; patients should temporarily limit their physical activity when discontinuing therapy.1 2 3 4
-
Importance of patients informing anesthesiologist or dentist about labetalol therapy before undergoing major surgery.1 2 3 4
-
Importance of immediately informing clinician at the first sign or symptom of impending cardiac failure or if any difficulty in breathing occurs.1 2 3 4
-
Importance of informing clinicians of existing or contemplated concomitant therapy, including prescription and OTC drugs, as well as any concomitant illnesses.1 2 3 4
-
Advise patients that transient scalp tingling may occur, usually during initiation of labetalol therapy.1 2 3 4
-
Caution geriatric patients about the possibility of orthostatic symptoms (orthostatic hypotension, dizziness, lightheadedness).4
-
Importance of women informing clinicians if they are or plan to become pregnant or plan to breast-feed.1 2 3 4 247 248
-
Importance of informing patients of other important precautionary information. (See Cautions.)
Preparations
Excipients in commercially available drug preparations may have clinically important effects in some individuals; consult specific product labeling for details.
Please refer to the ASHP Drug Shortages Resource Center for information on shortages of one or more of these preparations.
* available from one or more manufacturer, distributor, and/or repackager by generic (nonproprietary) name
Routes |
Dosage Forms |
Strengths |
Brand Names |
Manufacturer |
---|---|---|---|---|
Oral |
Tablets, film-coated |
100 mg* |
Labetalol Hydrochloride Tablets |
|
200 mg* |
Labetalol Hydrochloride Tablets |
|||
300 mg* |
Labetalol Hydrochloride Tablets |
|||
Parenteral |
Injection, for IV use |
5 mg/mL* |
Labetalol Hydrochloride Injection |
AHFS DI Essentials™. © Copyright 2021, Selected Revisions February 25, 2019. American Society of Health-System Pharmacists, Inc., 4500 East-West Highway, Suite 900, Bethesda, Maryland 20814.
† Use is not currently included in the labeling approved by the US Food and Drug Administration.
References
1. Schering Corporation. Normodyne (labetalol hydrochloride) injection prescribing information (dated 1997 Feb). In: Physicians’ desk reference. 52nd ed. Montvale, NJ: Medical Economical Company Inc; 1998(Suppl A):A280-2.
2. Schering Corporation. Normodyne tablets prescribing information. Kenilworth, NJ; 1990 Apr.
3. Glaxo Wellcome. Hanburys. Trandate (labetalol hydrochloride) injection prescribing information. Research Triangle Park, NC; 1998 Apr.
4. Glaxo Wellcome. Trandate (labetalol hydrochloride) tablets prescribing information. Research Triangle Park, NC; 1998 Jun.
5. Schering Corporation. Normodyne (labetalol HCl) product monograph. Kenilworth, NJ; 1984.
6. Glaxo Inc. Product information form for American Hospital Formulary Service on Trandate. Research Triangle Park, NC; 1984 Aug 24.
7. MacCarthy EP, Bloomfield SS. Labetalol: a review of its pharmacology, pharmacokinetics, clinical uses and adverse effects. Pharmacotherapy. 1983; 3:193-219. http://www.ncbi.nlm.nih.gov/pubmed/6310529?dopt=AbstractPlus
8. Wallin JD, O’Neill WM. Labetalol: current research and therapeutic status. Arch Intern Med. 1983; 143:485-90. http://www.ncbi.nlm.nih.gov/pubmed/6338850?dopt=AbstractPlus
9. Michelson EL, Frishman WH. Labetalol: an alpha- and beta-adrenoceptor blocking drug. Ann Intern Med. 1983; 99:553-5. http://www.ncbi.nlm.nih.gov/pubmed/6137987?dopt=AbstractPlus
10. McNeil JJ, Louis WJ. Clinical pharmacokinetics of labetalol. Clin Pharmacokinet. 1984; 9:157-67. http://www.ncbi.nlm.nih.gov/pubmed/6370541?dopt=AbstractPlus
11. Weber MA. Beta blockers in the initial therapy of hypertension. Drug Ther. 1980; 10(11):77-80.
12. Anon. Beta-blocker poisoning. Lancet. 1980; 1:803-4.
14. Pearson RM, Griffith DNW, Woollard M et al. Comparison of effects on cerebral blood flow of rapid reduction in systemic arterial pressure by diazoxide and labetalol in hypertensive patients: preliminary findings. Br J Clin Pharmacol. 1979; 8(Suppl 2):195-8S.
15. MacCarthy EP, Frost GW, Stokes GS. Labetalol in hypertensive emergencies. Med J Aust. 1978; 1:399-400. http://www.ncbi.nlm.nih.gov/pubmed/672732?dopt=AbstractPlus
16. Yeung CK, Thomas GW, Whitworth JA et al. Comparison of labetalol, clonidine and diazoxide intravenously administered in severe hypertension. Med J Aust. 1979; 2:499-500. http://www.ncbi.nlm.nih.gov/pubmed/522807?dopt=AbstractPlus
17. Quyyumi AA, Wright C, Mockus L et al. Effects of combined alpha and beta adrenoceptor blockade in patients with angina pectoris. A double blind study comparing labetalol with placebo. Br Heart J. 1985; 53:47-52. http://www.ncbi.nlm.nih.gov/pubmed/3881105?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=481720&blobtype=pdf
18. Upward JW, Akhras F, Jackson G. Oral labetalol in the management of stable angina pectoris in normotensive patients. Br Heart J. 1985; 53:53-7. http://www.ncbi.nlm.nih.gov/pubmed/3917674?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=481721&blobtype=pdf
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24. Gross F. The place of α-adrenoceptor and β-adrenoceptor blockade in the treatment of hypertension. Br J Clin Pharmacol. 1982; 13(Suppl 1):5-11S. http://www.ncbi.nlm.nih.gov/pubmed/7039647?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1401764&blobtype=pdf
25. Semplicini A, Pessina AC, Rossi GP et al. Alpha-adrenoceptor blockade by labetalol during long-term dosing. Clin Pharmacol Ther. 1983; 33:279-82.
26. Brittain RT, Drew GM, Levy GP. The α- and β-adrenoceptor potencies of labetalol and its individual stereoisomers. Br J Pharmacol. 1981; 73:282-3P.
27. Bellamy GR, Hunyor SN, Roffe D et al. Magnitude and mechanisms of the antihypertensive action of labetalol, including ambulatory assessment. Br J Clin Pharmacol. 1983; 16:9-16. http://www.ncbi.nlm.nih.gov/pubmed/6882628?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1427951&blobtype=pdf
28. Farmer JB, Kennedy I, Levy GB et al. Pharmacology of AH 5158; a drug which blocks both α- and β-adrenoceptors. Br J Pharmacol. 1972; 45:660-75. http://www.ncbi.nlm.nih.gov/pubmed/4404413?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1665961&blobtype=pdf
29. Weber MA, Drayer JIM. Central and peripheral blockade of the sympathetic nervous system. Am J Med. 1984; 77(Suppl 4A):110-8. http://www.ncbi.nlm.nih.gov/pubmed/6148889?dopt=AbstractPlus
30. Baum T, Sybertz EJ. Pharmacology of labetalol in experimental animals. Am J Med. 1983; 75(Suppl 4A):15-23. http://www.ncbi.nlm.nih.gov/pubmed/6314811?dopt=AbstractPlus
31. Yuen PC, Taddei CR, Wyka BE et al. Compatibility and stability of labetalol hydrochloride in commonly used intravenous solutions. Am J Hosp Pharm. 1983; 40:1007-9. http://www.ncbi.nlm.nih.gov/pubmed/6869384?dopt=AbstractPlus
32. Richards DA, Prichard BNC. Clinical pharmacology of labetalol. Br J Clin Pharmacol. 1979; 8(Suppl 2):89-93S. http://www.ncbi.nlm.nih.gov/pubmed/552303?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1429719&blobtype=pdf
33. McNeil JJ, Anderson AE, Louis WJ. Pharmacokinetics and pharmacodynamic studies of labetalol in hypertensive subjects. Br J Clin Pharmacol. 1979; 8(Suppl 2):157-61S.
34. Leitz F, Bariletto S, Chung M et al. Bioavailability/pharmacokinetics of labetalol in normotensive male volunteers. Fed Proc. 1982; 41:1557.
35. Kanto J, Allonen H, Kleimola T et al. Pharmacokinetics of labetalol in healthy volunteers. Int J Clin Pharmacol Ther Toxicol. 1981; 19:41-4. http://www.ncbi.nlm.nih.gov/pubmed/7203731?dopt=AbstractPlus
36. Mantyla R, Allonen H, Kanto J et al. Effect of food on the bioavailability of labetalol. Br J Clin Pharmacol. 1980; 9:435-7. http://www.ncbi.nlm.nih.gov/pubmed/7378263?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1429980&blobtype=pdf
37. Daneshmend TK, Roberts CJC. The influence of food on the oral and intravenous pharmacokinetics of a high clearance drug: a study with labetalol. Br J Clin Pharmacol. 1982; 14:73-8. http://www.ncbi.nlm.nih.gov/pubmed/7104169?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1427574&blobtype=pdf
38. Kelly JG, McGarry K, O’Malley K et al. Bioavailability of labetalol increases with age. Br J Clin Pharmacol. 1982; 14:304-5. http://www.ncbi.nlm.nih.gov/pubmed/7104187?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1427732&blobtype=pdf
39. Homeida M, Jackson L, Roberts CJC. Decreased first-pass metabolism of labetalol in chronic liver disease. Br Med J. 1978; 2:1048-50. http://www.ncbi.nlm.nih.gov/pubmed/709214?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1608159&blobtype=pdf
40. Daneshmend TK, Homeida M, Roberts CJC. The effect of hepatosplenic schistosomiasis on the pharmacokinetics of metronidazole and labetalol. Br J Clin Pharmacol. 1982; 14:152-3P.
41. McNeil JJ, Anderson AE, Louis WJ et al. Labetalol steady-state pharmacokinetics in hypertensive patients. Br J Clin Pharmacol. 1982; 13(Suppl 1):75-80S.
42. Sanders GL, Routledge PA, Ward A et al. Mean steady-state plasma concentrations of labetalol in patients undergoing antihypertensive therapy. Br J Clin Pharmacol. 1979; 8(Suppl 2):153-5S.
43. Maronde RF, Robinson D, Vlachakis ND et al. Study of single and multiple dose pharmacokinetic/pharmacodynamic modeling of antihypertensive effects of labetalol. Am J Med. 1983; 75(Suppl 4A):40-6. http://www.ncbi.nlm.nih.gov/pubmed/6356898?dopt=AbstractPlus
44. Brittain RT, Drew GM, Levy GP. The α- and β-adrenoceptor blocking potencies of labetalol and its individual stereoisomers in anaesthetized dogs and in isolated tissues. Br J Pharmacol. 1982; 77:105-14. http://www.ncbi.nlm.nih.gov/pubmed/6127131?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=2044658&blobtype=pdf
45. Alam AS. Identification of labetalol precipitate. Am J Hosp Pharm. 1984; 41:74. http://www.ncbi.nlm.nih.gov/pubmed/6695936?dopt=AbstractPlus
46. McNeil JJ, Anderson AE, Louis WJ. An analysis of the blood pressure response to labetalol in hypertensive patients. Clin Sci. 1981; 61(Suppl):449-52S.
47. Lund-Johansen P. Short- and long-term (six-year) hemodynamic effects of labetalol in essential hypertension. Am J Med. 1983; 75(Suppl 4A):24-31. http://www.ncbi.nlm.nih.gov/pubmed/6638038?dopt=AbstractPlus
48. Serlin MJ, Orme MC, Maciver M et al. Rate of onset of hypotensive effect of oral labetalol. Br J Clin Pharmacol. 1979; 7:165-8. http://www.ncbi.nlm.nih.gov/pubmed/760748?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1429443&blobtype=pdf
49. Lund-Johansen P, Bakke OM. Haemodynamic effects and plasma concentrations of labetalol during long-term treatment of essential hypertension. Br J Clin Pharmacol. 1979; 7:169-74. http://www.ncbi.nlm.nih.gov/pubmed/760749?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1429429&blobtype=pdf
50. Richards DA, Maconochie JG, Bland RE et al. Relationship between plasma concentrations and pharmacological effects of labetalol. Eur J Clin Pharmacol. 1977; 11:85-90. http://www.ncbi.nlm.nih.gov/pubmed/14010?dopt=AbstractPlus
51. Cumming AMM, Brown JJ, Lever AF et al. Intravenous labetalol in the treatment of severe hypertension. Br J Clin Pharmacol. 1982; 13(Suppl 1):93-6S.
52. Dal Palu C, Pessina AC, Semplicini A et al. Intravenous labetalol in severe hypertension. Br J Clin Pharmacol. 1982; 13(Suppl 1):97-9S.
53. Cressman MD, Vidt DG, Gifford RW et al. Intravenous labetalol in the management of severe hypertension and hypertensive emergencies. Am Heart J. 1984; 107(5 Part 1):980-5. http://www.ncbi.nlm.nih.gov/pubmed/6720529?dopt=AbstractPlus
54. Trust PM, Rosei EA, Brown JJ et al. Effect of blood pressure, angiotensin II and aldosterone concentrations during treatment of severe hypertension with intravenous labetalol: comparison with propranolol. Br J Clin Pharmacol. 1976; 3(Suppl 3):799-803. http://www.ncbi.nlm.nih.gov/pubmed/791333?dopt=AbstractPlus
55. Rosei EA, Trust PM, Brown JJ et al. Effects of intravenous labetalol on blood pressure, angiotensin II and aldosterone in hypertension: comparison with propranolol. Clin Sci Mol Med. 1976; 51(Suppl 3):497-9S.
56. Davies AB, Bala Subramanian V, Gould B et al. Rapid reduction of blood pressure with acute oral labetalol. Br J Clin Pharmacol. 1982; 13:705-10. http://www.ncbi.nlm.nih.gov/pubmed/7082539?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1402081&blobtype=pdf
57. Rossi A, Ziacchi V, Lomanto B. The hypotensive effect of a single daily dose of labetalol: a preliminary study. Int J Clin Pharmacol Ther Toxicol. 1982; 20:438-45. http://www.ncbi.nlm.nih.gov/pubmed/6754634?dopt=AbstractPlus
58. Martin LE, Hopkins R, Bland R. Metabolism of labetalol by animals and man. Br J Clin Pharmacol. 1976; 3(Suppl 3):695-710. http://www.ncbi.nlm.nih.gov/pubmed/990152?dopt=AbstractPlus
59. Chung M, Ning J, Radwanski E et al. Multiple-dose pharmacokinetics of labetalol in hypertensive patients. In: Abstracts of papers presented before the APhA Academy of Pharmaceutical Sciences. Washington, DC: American Pharmaceutical Association; 1982; 12(1):49. Abstract.
60. Wood AJ, Ferry DG, Bailey RR. Elimination kinetics of labetalol in severe renal failure. Br J Clin Pharmacol. 1982; 13(Suppl 1):81-6S. http://www.ncbi.nlm.nih.gov/pubmed/7066158?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1401780&blobtype=pdf
61. Baum T, Watkins RW, Sybertz EJ et al. Antihypertensive and hemodynamic actions of SCH 19927, the R, R-isomer and labetalol. J Pharmacol Exp Ther. 1981; 218:444-52. http://www.ncbi.nlm.nih.gov/pubmed/7252843?dopt=AbstractPlus
62. Sybertz EJ, Sabin CS, Pula KK et al. Alpha and beta adrenoceptor blocking properties of labetalol and its R, R-isomer, SCH 19927. J Pharmacol Exp Ther. 1981; 218:435-43. http://www.ncbi.nlm.nih.gov/pubmed/6114171?dopt=AbstractPlus
63. Rubin PC, Butters L, Kelman AW et al. Labetalol disposition and concentration-effect relationships during pregnancy. Br J Clin Pharmacol. 1983; 15:465-70. http://www.ncbi.nlm.nih.gov/pubmed/6849783?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1427790&blobtype=pdf
64. Michael CA. Use of labetalol in the treatment of severe hypertension during pregnancy. Br J Clin Pharmacol. 1979; 8(Suppl 2):211-5S.
65. Riley AJ. Clinical pharmacology of labetalol in pregnancy. J Cardiovasc Pharmacol. 1982; 3(Suppl 1):S53-9.
66. Nylund L, Lunell NO, Lewander R et al. Labetalol for the treatment of hypertension in pregnancy: pharmacokinetics and effects on the uteroplacental blood flow. Acta Obstet Gynecol Scand. 1984; 118(Suppl):71-3.
67. Poynter D, Martin LE, Harrison C et al. Affinity of labetalol for ocular melanin. Br J Clin Pharmacol. 1976; 3(Suppl 3):711-20. http://www.ncbi.nlm.nih.gov/pubmed/990153?dopt=AbstractPlus
68. Michael CA. The evaluation of labetalol in the treatment of hypertension complicating pregnancy. Br J Clin Pharmacol. 1982; 13(Suppl 1):127-31S. http://www.ncbi.nlm.nih.gov/pubmed/7066151?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1401781&blobtype=pdf
69. Leitz F, Bariletto S, Gural R et al. Secretion of labetalol in breast milk in lactating women. Fed Proc. 1983; 42:378.
70. Lardoux H, Gerard J, Blazquez G et al. Which beta-blocker in pregnancy-induced hypertension? Lancet. 1983; 2:1194. Letter. (IDIS 178452)
71. Walstad AA, Berg KJ, Wessel-Aas T et al. Labetalol in the treatment of hypertension in patients with normal and impaired renal function. Acta Med Scand. 1982; 212(Suppl):135-41.
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73. Anon. Drugs for hypertensive emergencies. Med Lett Drugs Ther. 1985; 27:22-4. http://www.ncbi.nlm.nih.gov/pubmed/3883117?dopt=AbstractPlus
74. Davidov ME, Moir GD, Poland MP et al. Monotherapy in the treatment of mild hypertension: a double-blind study. Am J Med. 1983; 75(Suppl 4A): 47-53.
75. Frishman WH, Michelson EL, Johnson BF et al. Multiclinic comparison of labetalol and metoprolol in treatment of mild to moderate systemic hypertension. Am J Med. 1983; 75(Suppl 4A):54-67. http://www.ncbi.nlm.nih.gov/pubmed/6356900?dopt=AbstractPlus
76. Michelson EL, Frishman WH, Lewis JE et al. Multicenter clinical evaluation of long-term efficacy and safety of labetalol in treatment of hypertension. Am J Med. 1983; 75(Suppl 4A):68-80. http://www.ncbi.nlm.nih.gov/pubmed/6356901?dopt=AbstractPlus
77. Bloomfield SS, Lucas CP, Gantt CL et al. Step II treatment with labetalol for essential hypertension. Am J Med. 1983; 75(Suppl 4A):81-6. http://www.ncbi.nlm.nih.gov/pubmed/6356902?dopt=AbstractPlus
78. Wallin JD, Wilson D, Winer N et al. Treatment of severe hypertension with labetalol compared with methyldopa and furosemide. Am J Med. 1983; 75(Suppl 4A):87-94. http://www.ncbi.nlm.nih.gov/pubmed/6356903?dopt=AbstractPlus
79. Wilson DJ, Wallin JD, Vlachakis ND et al. Intravenous labetalol in the treatment of severe hypertension and hypertensive emergencies. Am J Med. 1983; 75(Suppl 4A):95-102. http://www.ncbi.nlm.nih.gov/pubmed/6139020?dopt=AbstractPlus
80. McAreavey D, Ramsey LE, Latham L et al. “Third drug” trial: comparative study of antihypertensive agents added to treatment when blood pressure remains uncontrolled by a beta blocker plus thiazide diuretic. BMJ. 1984; 288:106-11. http://www.ncbi.nlm.nih.gov/pubmed/6419809?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1443950&blobtype=pdf
81. Waal-Manning HJ, Simpson FO. Review of long-term treatment with labetalol. Br J Clin Pharmacol. 1982; 13(Suppl 1):66-73S.
82. Kane JA. Labetalol in general practice: a review. Br J Clin Pharmacol. 1982; 13(Suppl 1):59-63S.
83. Breckenridge A, Orme M, Serlin MJ et al. Labetalol in essential hypertension. Br J Clin Pharmacol. 1982; 13(Suppl 1):37-39S.
84. Mancia G, Pomidossi G, Parati G et al. Blood pressure response to labetalol in twice and three times daily administration during a 24-hour period. Br J Clin Pharmacol. 1982; 13(Suppl 1):27-35S.
85. Takeda T, Kaneko Y, Omae T et al. The use of labetalol in Japan: results of multicentre clinical trials. Br J Clin Pharmacol. 1982; 13(Suppl 1):49-57S.
86. Sanders GL, Davies DM, Gales GM et al. A comparative study of methyldopa and labetalol in the treatment of hypertension. Br J Clin Pharmacol. 1979; 8(Suppl 2):149-51S. http://www.ncbi.nlm.nih.gov/pubmed/385023?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1429771&blobtype=pdf
87. NcNeil JJ, Louis WJ. A double-blind crossover comparison of pindolol, metoprolol, atenolol and labetalol in mild to moderate hypertension. Br J Clin Pharmacol. 1979; 8(Suppl 2):163-6S. http://www.ncbi.nlm.nih.gov/pubmed/486291?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1429768&blobtype=pdf
88. Kane J, Gregg I. A long-term study of labetalol in general practice. Br J Clin Pharmacol. 1979; 8(Suppl 2):167-70S.
89. Prichard BNC, Boakes HJ, Hernandez R. Long-term treatment of hypertension with labetalol. Br J Clin Pharmacol. 1979; 8(Suppl 2):171-7S.
90. New Zealand Hypertension Study Group. A multicentre open trial of labetalol in New Zealand. Br J Clin Pharmacol. 1979; 8(Suppl 2):179-82S. http://www.ncbi.nlm.nih.gov/pubmed/486293?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1429777&blobtype=pdf
91. Williams LC, Murphy MJ, Parsons V. Labetalol in severe and resistant hypertension. Br J Clin Pharmacol. 1979; 8(Suppl 2):143-7S. http://www.ncbi.nlm.nih.gov/pubmed/39585?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1429781&blobtype=pdf
92. Ghose RR. Acute management of severe hypertension with oral labetalol. Br J Clin Pharmacol. 1979; 8(Suppl 2):189-93S. http://www.ncbi.nlm.nih.gov/pubmed/385027?dopt=AbstractPlus http://www.pubmedcentral.nih.gov/picrender.fcgi?tool=pmcentrez&artid=1429780&blobtype=pdf
93. Cumming AMM, Brown JJ, Lever AF et al. Treatment of severe hypertension by repeated bolus injections of labetalol. Br J Clin Pharmacol. 1979; 8(Suppl 2):199-204S.
94. Smith WB, Clifton GG, O’Neill WM et al. Antihypertensive effectiveness of intravenous labetalol in accelerated hypertension. Hypertension. 1983; 5:579-83. http://www.ncbi.nlm.nih.gov/pubmed/6862581?dopt=AbstractPlus
95. Lamming GD, Symonds EM. Use of labetalol and methyldopa in pregnancy-induced hypertension. Br J Clin Pharmacol. 1979; 8(Suppl 2):217-22S.
96. Prichard BNC, Richards DA. Comparison of labetalol with other anti-hypertensive drugs. Br J Clin Pharmacol. 1982; 13(Suppl 1):41-7S.
97. Seedat YK. The stepped-care approach to the treatment of hypertension in black patients. S Afr Med J. 1982; 62:1033-5. http://www.ncbi.nlm.nih.gov/pubmed/6817425?dopt=AbstractPlus
98. Thompson FD, Joekes AM, Hussein MM. Monotherapy with labetalol for hypertensive patients with normal and impaired renal function. Br J Clin Pharmacol. 1979; 8(Suppl 2):129-33S.
99. van der Veur E, ten Berge BS, Donker AJ et al. Comparison of labetalol, propranolol and hydralazine in hypertensive out-patients. Eur J Clin Pharmacol. 1982; 21:457-60. http://www.ncbi.nlm.nih.gov/pubmed/7042373?dopt=AbstractPlus
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