The minimum quality standard

When a New Zealand clinician writes a prescription for medicinal cannabis, the item that arrives at the pharmacy is not what a person might buy from an unregulated seller. It is a manufactured pharmaceutical, produced under Good Manufacturing Practice (GMP) requirements, assessed by Medsafe, and supplied through a licensed pharmacy. That is the minimum quality benchmark under New Zealand law. It confirms the preparation contains what the label says, is free from contaminants, and was made under controlled conditions. It does not, on its own, prove that the preparation will work for your condition.

The legal route is the Medicinal Cannabis Scheme, established under the Misuse of Drugs (Medicinal Cannabis) Regulations 2019. The scheme is administered by the Medicinal Cannabis Agency (MCA), a unit within Medsafe, and it came into full effect on 1 April 2020. Under this scheme, a medical practitioner can prescribe a cannabis medicine that meets GMP requirements and has been notified to the Ministry of Health. The medicine is then supplied through a licensed pharmacy. The scheme does not create a general licence to possess or use cannabis; it creates a regulated pharmaceutical pathway.

What the minimum quality benchmark is

Under the regulations, which came into force on 1 April 2020, a medicinal cannabis preparation must:

• Be manufactured to GMP requirements.
• Be approved by the Ministry of Health before it can be prescribed, supplied, or imported.
• Be prescribed by a medical practitioner under the Misuse of Drugs Act.
• Be supplied through a pharmacy, not a general dispensary or unlicensed outlet.

The quality benchmark is therefore a pharmaceutical one, not a horticultural one. It does not certify that a preparation will work for a given condition; it certifies that the preparation is what its label says, is free from contaminants, and was made under controlled conditions.

What the benchmark actually assures

Medicinal cannabis medicines must meet GMP requirements and, for finished items, be listed on the Medicinal Cannabis Scheme’s product notification database before they can be prescribed and supplied.

The benchmark assures four things:

1. Manufacturing quality. The medicine is made under GMP, meaning consistent batch-to-batch content and controlled production environments.
2. Contaminant limits. Testing covers pesticides, mould, heavy metals, and microbial impurities. This is a safety threshold, not a therapeutic claim.
3. Accurate labelling. THC and CBD content is stated in mg/g (or %) and must match lab results within accepted tolerances.
4. Legal traceability. The medicine is part of the NZ Medicinal Cannabis Scheme, which means it was imported or manufactured under licence, and can be prescribed and supplied through the pharmacy chain.

What the benchmark does not prove

• It does not prove the medicine will work for your condition.
• It does not prove the medicine is “clean” in a holistic sense; it proves it meets pharmaceutical manufacturing and testing thresholds.
• It does not prove that one brand is better than another; GMP is a baseline, not a ranking.
• It does not guarantee absence of side effects or drug interactions.
• It does not mean the medicine is approved for a specific indication; approval is at the product level, not the condition level.

What the benchmark does assure

• The medicine was manufactured under GMP, meaning quality control, batch-to-batch consistency, and contamination testing (pesticides, heavy metals, microbials) as required by the Medicines Regulations.
• The medicine has been assessed and approved by the Ministry of Health under the Misuse of Drugs (Medicinal Cannabis) Regulations 2019.
• The label states exact THC and CBD content in mg/g, allowing the prescriber to dose predictably.
• The medicine is supplied through a licensed pharmacy, not a retail shop or online store.

Current thresholds and rules

• GMP certification: Required for all medicines under the Medicinal Cannabis Scheme; verified by Medsafe or an equivalent overseas regulator.
• THC limit for CBD-dominant medicines: ≤2 mg/g THC (0.2%) under the Misuse of Drugs (Medicinal Cannabis) Regulations 2019.
• THC limit for THC-dominant medicines: No fixed upper limit, but the medicine must be GMP-certified and approved by the MCA.
• Prescription requirement: Must be issued by a medical practitioner authorised under Section 29 of the Misuse of Drugs Act 1975; nurse practitioners cannot prescribe cannabis.
• Approved medicines list: Maintained by the MCA; as of 2024, over 100 items are listed.
• Prescriber requirement: Any doctor registered in NZ can prescribe, but must meet the requirements of the Medicinal Cannabis Scheme; specialist endorsement is not required, but good practice includes reviewing the NZ Formulary.
• Cost: Not standardised; a typical monthly prescription (oil, 30 mL) is between about $200 and about $600 NZD, but this is an estimate, not a fixed price.
• Legal status: The Misuse of Drugs (Medicinal Cannabis) Amendment Act 2018 legalised the scheme; the Misuse of Drugs (Medicinal Cannabis) Regulations 2019 set product requirements; both are administered by the Ministry of Health and Medsafe.
• Quality requirements: Medicines must be GMP-certified, contain no more than 0.35% THC in CBD-only items, and be approved by the Ministry of Health under Section 29 of the Misuse of Drugs Act 1975.

How to check whether a medicine meets the benchmark

Before you fill a prescription, confirm three things:

1. Check the MCA database. Visit the Medicinal Cannabis Agency’s online list of approved medicines. If the item is not listed, it has not been assessed under the scheme.
2. Ask the pharmacist. A licensed pharmacy can only supply medicines that have been notified to the Ministry of Health. Ask, “Is this item listed on the MCA database?”
3. Read the label. The label must show THC and CBD content in mg/g. If those numbers are missing or look handwritten, the item has not passed the labelling requirement.

How to access quality-assured medicinal cannabis

The legal route follows four steps. Do not skip any of them.

1. Book a consultation with a registered medical practitioner. Any doctor in New Zealand can prescribe, but many choose not to. Call the clinic first and ask, “Does this doctor prescribe medicinal cannabis under the Medicinal Cannabis Scheme?”
2. Attend the appointment with a clear symptom history. The doctor will assess eligibility under the scheme. Bring a list of treatments you have already tried, because medicinal cannabis is generally considered when other options have not worked.
3. Collect the prescription from a licensed pharmacy. The medicine cannot be dispensed from a general retail outlet. If a seller offers to ship it without a pharmacy label, it is not a legal supply.
4. Start with the lowest dose your prescriber recommends. GMP labelling lets you measure accurately. Record any side effects and report them to your doctor at the next review.

The scheme is not a general licence: it is a regulated pharmaceutical pathway. The legal item is a manufactured pharmaceutical, and raw flower, while available, is prescribed and supplied through a pharmacy, not a dispensary.