Drug interactions
Baclofen + Diphenhydramine
Severity: Moderate
Baclofen and Diphenhydramine: 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
Diphenhydramine is a strongly sedating antihistamine with anticholinergic effects. Together with baclofen, sedation, confusion and falls may increase, especially in the elderly.
What this interaction means in plain words
Baclofen and Diphenhydramine 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.
Baclofen belongs to Musculoskeletal; Diphenhydramine belongs to Respiratory.
Why it happens
Additive CNS depression from H1 antagonism and baclofen's GABA-B agonism.
What to do
Avoid driving and alcohol, and prefer a non-sedating antihistamine, particularly in older patients. Reduce doses if sedation is excessive.
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 Baclofen and Diphenhydramine, 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 14 days on the web. No card needed.
Other interactions of Baclofen
Other interactions of Diphenhydramine
Frequently asked questions
Can I take Baclofen with Diphenhydramine?
MediHelp rates the interaction as moderate. Baclofen and Diphenhydramine 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. Diphenhydramine is a strongly sedating antihistamine with anticholinergic effects. Together with baclofen, sedation, confusion and falls may increase, especially in the elderly.
How serious is the interaction between Baclofen and Diphenhydramine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid driving and alcohol, and prefer a non-sedating antihistamine, particularly in older patients. Reduce doses if sedation is excessive.
What other medicines interact with Baclofen?
MediHelp also lists interactions of Baclofen with, for example, Alfentanil, Amobarbital, Belladonna and opium. The full list is on the Baclofen 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.
