Drug interactions
Marijuana + Melatonin
Severity: Minor
Marijuana and Melatonin: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Cannabis causes drowsiness and impaired coordination, and melatonin is also sedating. Concurrent use may increase impairment and next-day grogginess.
What this interaction means in plain words
Marijuana and Melatonin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Additive central nervous system depressant effects.
What to do
Counsel the patient to avoid driving or hazardous tasks after using both. Reduce one agent if excessive sedation occurs.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Melatonin
- Fluvoxamine + Melatonin Major
- Alfentanil + Melatonin Moderate
- Belladonna and opium + Melatonin Moderate
- Buprenorphine buccal + Melatonin Moderate
- Butabarbital + Melatonin Moderate
- Butalbital + Melatonin Moderate
Frequently asked questions
Can I take Marijuana with Melatonin?
MediHelp rates the interaction as minor. Marijuana and Melatonin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Cannabis causes drowsiness and impaired coordination, and melatonin is also sedating. Concurrent use may increase impairment and next-day grogginess.
How serious is the interaction between Marijuana and Melatonin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Counsel the patient to avoid driving or hazardous tasks after using both. Reduce one agent if excessive sedation occurs.
What other medicines interact with Melatonin?
MediHelp also lists interactions of Melatonin with, for example, Fluvoxamine, Alfentanil, Belladonna and opium. The full list is on the Melatonin page.
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