Plain packaging should be extended to party pills and synthetic cannabis to reduce the appeal of these drugs to young people, a lobby group says.
New Zealand Drug Foundation wants new legislation which regulates synthetic drugs to include stricter rules on packaging in order to make the products "as unsexy as possible".
The Psychoactive Substances Bill was tabled in Parliament last month, and would require drug manufacturers to prove their products were safe, at their own cost, before the drugs could be sold.
The new bill set many restrictions such as a minimum purchase age of 18 for approved psychoactive drugs, and a ban on advertising.
But New Zealand Drug Foundation executive director Ross Bell wanted it to go further. He said that plain packaging should be introduced as part of the legislation to prevent legal battles with the industry in future.