Drug interactions
Loperamide + Phenobarbital
Severity: Minor
Loperamide and Phenobarbital: minor 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
Phenobarbital induces CYP enzymes and possibly P-glycoprotein, which may lower loperamide exposure. Reduced antidiarrheal effect is possible, though clinical impact is generally limited.
What this interaction means in plain words
Loperamide and Phenobarbital have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Enzyme and transporter induction accelerates loperamide clearance.
What to do
Monitor antidiarrheal response and adjust loperamide within labeled limits only if needed.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Loperamide
Frequently asked questions
Can I take Loperamide with Phenobarbital?
MediHelp rates the interaction as minor. Loperamide and Phenobarbital have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Phenobarbital induces CYP enzymes and possibly P-glycoprotein, which may lower loperamide exposure. Reduced antidiarrheal effect is possible, though clinical impact is generally limited.
How serious is the interaction between Loperamide and Phenobarbital?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor antidiarrheal response and adjust loperamide within labeled limits only if needed.
What other medicines interact with Loperamide?
MediHelp also lists interactions of Loperamide with, for example, Amiodarone, Amisulpride, Anagrelide. The full list is on the Loperamide page.
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