The seizure of several hundred kilograms of a precursor to the drug methampethamine came mostly from China, Prime Minister John Key says.
Mr Key on Monday released the findings of an eight-week operation by customs officials to try and reduce the amount of pseudoephedrine imported into New Zealand.
The operation was part of the Government's strategy to tackle the manufacture and distribution of methamphetamine, also known as the drug "P".
During the operation in October and November, customs intercepted a total of 230kg of pseudoephedrine, compared with 67kg over the same period last year.
Fifteen people have been arrested.
Mr Key says pseudoephedrine was found in a range of items, from toys to fake tins of food and the increased number of interceptions at the border shows the Government's plans to tackle the drug "P" are working.