From the link supplied by Nancy.
Bringing medicines into New Zealand on your person or in your luggage
If you are arriving into New Zealand and carrying prescription medicines (other than controlled drugs) either on your person or in your luggage you must ensure:
- You declare the possession of those medicines on your incoming passenger arrival card which is lawfully required, and inspected, by the New Zealand Customs Service if the quantity of medicines is over 3 months supply or the medicine is not prescribed to you,