Drug interactions
Doxylamine + Marijuana
Severity: Moderate
Doxylamine and Marijuana: moderate 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
Doxylamine is a sedating first-generation antihistamine and cannabis also impairs alertness and psychomotor performance. Taken together they can cause deeper drowsiness, slowed reaction time and impaired driving ability.
What this interaction means in plain words
Doxylamine and Marijuana can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Additive central nervous system depression from H1 antagonism and cannabinoid receptor activation.
What to do
Advise patients to avoid driving or operating machinery while using both. Counsel on reducing cannabis use or doxylamine dose if excessive sedation occurs.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Doxylamine and Marijuana, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Doxylamine
Frequently asked questions
Can I take Doxylamine with Marijuana?
MediHelp rates the interaction as moderate. Doxylamine and Marijuana can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Doxylamine is a sedating first-generation antihistamine and cannabis also impairs alertness and psychomotor performance. Taken together they can cause deeper drowsiness, slowed reaction time and impaired driving ability.
How serious is the interaction between Doxylamine and Marijuana?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise patients to avoid driving or operating machinery while using both. Counsel on reducing cannabis use or doxylamine dose if excessive sedation occurs.
What other medicines interact with Doxylamine?
MediHelp also lists interactions of Doxylamine with, for example, Belladonna and opium, Benzhydrocodone / acetaminophen, Brexanolone. The full list is on the Doxylamine page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
