Australian voluntary euthanasia advocate Philip Nitschke is organising return trips to Mexico for New Zealanders who want to buy suicide drugs, according to a media report.

Dr Nitschke says he plans to meet eight New Zealanders in the US next month before escorting them to Mexico, where the life-ending drug Nembutal can be bought legally.

The Darwin doctor told The Dominion Post newspaper it was up to the individuals whether to risk bringing the drug back to New Zealand.

New Zealand's customs department said if the drug was found on people entering the country it would be seized as with other "restricted or prohibited" goods.

Dr Nitschke is due to arrive in New Zealand this week to launch his controversial book The Peaceful Pill Handbook.

The New Zealand Medical Council has in the past complained to the health ministry about Dr Nitschke visiting and holding workshops here and has voiced concerns again about the upcoming visit.