Drug interactions
Diphenoxylate + Methocarbamol
Severity: Moderate
Diphenoxylate and Methocarbamol: 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
Diphenoxylate is an opioid antidiarrheal that may cause sedation, especially with overdose or in children. Adding methocarbamol can increase drowsiness and CNS depression.
What this interaction means in plain words
Diphenoxylate and Methocarbamol 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.
Diphenoxylate belongs to Gastrointestinal Tract; Methocarbamol belongs to Musculoskeletal.
Why it happens
Additive CNS depression from opioid activity and methocarbamol's central sedative effect.
What to do
Use the recommended diphenoxylate dose and monitor for sedation and respiratory depression. Counsel the patient to avoid driving or operating machinery until the response is known.
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?
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Other interactions of Methocarbamol
Other interactions of Diphenoxylate
Frequently asked questions
Can I take Diphenoxylate with Methocarbamol?
MediHelp rates the interaction as moderate. Diphenoxylate and Methocarbamol 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. Diphenoxylate is an opioid antidiarrheal that may cause sedation, especially with overdose or in children. Adding methocarbamol can increase drowsiness and CNS depression.
How serious is the interaction between Diphenoxylate and Methocarbamol?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use the recommended diphenoxylate dose and monitor for sedation and respiratory depression. Counsel the patient to avoid driving or operating machinery until the response is known.
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.
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