Drug interactions
Methocarbamol + Trifluoperazine
Severity: Moderate
Methocarbamol and Trifluoperazine: 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
Trifluoperazine is an antipsychotic with sedating properties, and methocarbamol adds CNS depression. Drowsiness, dizziness and impaired alertness may increase.
What this interaction means in plain words
Methocarbamol and Trifluoperazine 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 from a muscle relaxant and a phenothiazine antipsychotic.
What to do
Monitor for excess sedation and orthostatic symptoms, especially after starting or raising doses. Reduce the methocarbamol dose if drowsiness becomes troublesome.
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 Methocarbamol and Trifluoperazine, 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 Methocarbamol
Frequently asked questions
Can I take Methocarbamol with Trifluoperazine?
MediHelp rates the interaction as moderate. Methocarbamol and Trifluoperazine 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. Trifluoperazine is an antipsychotic with sedating properties, and methocarbamol adds CNS depression. Drowsiness, dizziness and impaired alertness may increase.
How serious is the interaction between Methocarbamol and Trifluoperazine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for excess sedation and orthostatic symptoms, especially after starting or raising doses. Reduce the methocarbamol dose if drowsiness becomes troublesome.
What other medicines interact with Methocarbamol?
MediHelp also lists interactions of Methocarbamol with, for example, Alfentanil, Amobarbital, Belladonna and opium. The full list is on the Methocarbamol 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.
