Medicinal cannabis can affect driving ability, particularly when a product contains THC (tetrahydrocannabinol). Patients using medicinal cannabis should understand how their medicine may affect them and the rules around driving in New Zealand.
Can You Drive After Taking Medicinal Cannabis?
Having a prescription does not automatically mean it is safe to drive after taking medicinal cannabis.
You should not drive if your medicine affects your ability to drive safely.
Possible effects can include:
- Drowsiness or tiredness
- Dizziness
- Slower reaction times
- Reduced concentration
- Impaired coordination
- Changes in judgement or perception
The effects vary depending on the product, dose and individual.
THC and Driving
THC is the main intoxicating compound in cannabis and can affect skills needed for safe driving.
THC-containing medicinal cannabis may affect:
- Reaction time
- Attention and concentration
- Coordination
- Decision-making
Patients prescribed THC-containing products should discuss driving with their healthcare professional and follow the instructions provided with their medicine.
What About CBD?
CBD (cannabidiol) does not generally produce the intoxicating effects associated with THC.
However, CBD products can still cause side effects in some people and may interact with other medicines.
If you experience drowsiness, dizziness or other effects that could interfere with safe driving, do not drive.
Does a Prescription Exempt You From Driving Laws?
A medicinal cannabis prescription does not provide permission to drive while impaired.
New Zealand’s drug-driving laws apply to drugs that can affect driving ability, including THC.
Patients should understand both the instructions associated with their prescribed medicine and current New Zealand driving requirements.
Before You Drive
Consider these practical points:
- Know whether your medicine contains THC
- Follow your prescribed dose
- Understand how the medicine affects you
- Check for interactions with other medicines
- Never drive if you feel impaired
- Ask your doctor or pharmacist if you are uncertain
Official Information
For current guidance, visit:
NZ Transport Agency Waka Kotahi — Alcohol and Drug Limits
NZ Transport Agency — How Medication Affects Driving
New Zealand Ministry of Health — Medicinal Cannabis Information for Consumers
Important
This information is for general educational purposes only and is not medical or legal advice. Driving laws and individual circumstances can differ. Patients should follow current NZTA guidance and discuss medicinal cannabis and driving with their healthcare professional.
