Drug interactions
Erlotinib + Marijuana
Severity: Minor
Erlotinib 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
Cannabinoids can inhibit CYP3A4 in vitro, which may modestly raise erlotinib levels. Smoking also induces CYP1A2 and lowers erlotinib exposure, a separate and more relevant effect.
What this interaction means in plain words
Erlotinib 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
Possible CYP3A4 inhibition by cannabinoids; smoked cannabis may induce CYP1A2.
What to do
Monitor tolerability and response. Counsel patients that smoking reduces erlotinib exposure.
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 Erlotinib
- Amobarbital + Erlotinib Major
- Apalutamide + Erlotinib Major
- Carbamazepine + Erlotinib Major
- Cobicistat + Erlotinib Major
- Darunavir + Erlotinib Major
- Dexlansoprazole + Erlotinib Major
Frequently asked questions
Can I take Erlotinib with Marijuana?
MediHelp rates the interaction as minor. Erlotinib 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. Cannabinoids can inhibit CYP3A4 in vitro, which may modestly raise erlotinib levels. Smoking also induces CYP1A2 and lowers erlotinib exposure, a separate and more relevant effect.
How serious is the interaction between Erlotinib 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: Monitor tolerability and response. Counsel patients that smoking reduces erlotinib exposure.
What other medicines interact with Erlotinib?
MediHelp also lists interactions of Erlotinib with, for example, Amobarbital, Apalutamide, Carbamazepine. The full list is on the Erlotinib page.
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