Legislation before Parliament will be amended to clamp down on synthetic cannabis products such as Kronic.
The Misuse of Drugs Amendment Bill, which makes a number of changes to drug laws, has passed its second reading in Parliament.
Associate Health Minister Peter Dunne says the bill will make the illegal manufacture of methamphetamine more difficult, by making the precursor substances available only on prescription.
He says he will make changes to the bill to control the increasing sale of synthetic cannabis products.
Mr Dunne says those amendments will be added when the bill is debated again in two weeks and will be law shortly after.