Drug interactions
Caffeine + Marijuana
Severity: Minor
Caffeine and Marijuana: 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
Caffeine can reduce the drowsiness caused by cannabis, while both can increase heart rate. Patients may underestimate their impairment because of the stimulant effect.
What this interaction means in plain words
Caffeine and Marijuana 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
Pharmacodynamic opposition of CNS effects via adenosine receptor antagonism, with additive tachycardia.
What to do
Counsel patients that caffeine does not reverse cannabis-related impairment of driving or psychomotor performance. Monitor heart rate in patients with cardiovascular disease.
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 Caffeine
- Caffeine + Ephedrine Major
- Caffeine + Fezolinetant Major
- Caffeine + Methylenedioxymethamphetamine Major
- Caffeine + Selegiline transdermal Major
- Adenosine + Caffeine Moderate
- Benzphetamine + Caffeine Moderate
Frequently asked questions
Can I take Caffeine with Marijuana?
MediHelp rates the interaction as minor. Caffeine and Marijuana have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Caffeine can reduce the drowsiness caused by cannabis, while both can increase heart rate. Patients may underestimate their impairment because of the stimulant effect.
How serious is the interaction between Caffeine and Marijuana?
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 patients that caffeine does not reverse cannabis-related impairment of driving or psychomotor performance. Monitor heart rate in patients with cardiovascular disease.
What other medicines interact with Caffeine?
MediHelp also lists interactions of Caffeine with, for example, Ephedrine, Fezolinetant, Methylenedioxymethamphetamine. The full list is on the Caffeine page.
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