Drug interactions
Loxapine + Marijuana
Severity: Moderate
Loxapine 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
Cannabis causes sedation, impaired cognition and tachycardia, and these effects add to those of loxapine. Cannabis may also worsen psychosis, and use with antipsychotics can increase drowsiness and orthostatic effects.
What this interaction means in plain words
Loxapine 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 CNS depression and cardiovascular effects; cannabinoids may also be metabolized by CYP enzymes shared with loxapine.
What to do
Counsel patients to avoid cannabis, and monitor for oversedation, tachycardia and worsening psychiatric symptoms.
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 Loxapine 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 Loxapine
- Alfentanil + Loxapine Major
- Alprazolam + Loxapine Major
- Amisulpride + Loxapine Major
- Amoxapine + Loxapine Major
- Apomorphine + Loxapine Major
- Belladonna and opium + Loxapine Major
Frequently asked questions
Can I take Loxapine with Marijuana?
MediHelp rates the interaction as moderate. Loxapine 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. Cannabis causes sedation, impaired cognition and tachycardia, and these effects add to those of loxapine. Cannabis may also worsen psychosis, and use with antipsychotics can increase drowsiness and orthostatic effects.
How serious is the interaction between Loxapine 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: Counsel patients to avoid cannabis, and monitor for oversedation, tachycardia and worsening psychiatric symptoms.
What other medicines interact with Loxapine?
MediHelp also lists interactions of Loxapine with, for example, Alfentanil, Alprazolam, Amisulpride. The full list is on the Loxapine 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.
