Drug interactions
Chlorpheniramine + Methocarbamol
Severity: Moderate
Chlorpheniramine 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
Chlorpheniramine is a sedating first-generation antihistamine, and methocarbamol also causes drowsiness. Combined use can increase sedation and impair concentration and coordination, with possible added confusion in older patients.
What this interaction means in plain words
Chlorpheniramine 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.
Chlorpheniramine belongs to Respiratory; Methocarbamol belongs to Musculoskeletal.
Why it happens
Additive CNS depression from H1 receptor blockade and methocarbamol's central effects.
What to do
Advise against driving and alcohol while taking both. Consider a non-sedating antihistamine as an alternative.
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 Chlorpheniramine
Frequently asked questions
Can I take Chlorpheniramine with Methocarbamol?
MediHelp rates the interaction as moderate. Chlorpheniramine 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. Chlorpheniramine is a sedating first-generation antihistamine, and methocarbamol also causes drowsiness. Combined use can increase sedation and impair concentration and coordination, with possible added confusion in older patients.
How serious is the interaction between Chlorpheniramine 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: Advise against driving and alcohol while taking both. Consider a non-sedating antihistamine as an alternative.
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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