Drug interactions
Biotin + Phenobarbital
Severity: Minor
Biotin 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
Long-term phenobarbital therapy has been associated with lower biotin concentrations. The clinical consequence is uncertain, but deficiency could contribute to skin, hair or neurological symptoms in prolonged use.
What this interaction means in plain words
Biotin 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-inducing anticonvulsants may increase biotin catabolism and possibly reduce its intestinal absorption; the exact mechanism is not firmly established.
What to do
No routine action is required; consider biotin supplementation if signs of deficiency appear during long-term therapy. Avoid interpreting biotin-sensitive lab assays without considering supplement intake.
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 Biotin
- Biotin + Levothyroxine Moderate
- Azithromycin + Biotin Minor
- Biotin + Carbamazepine Minor
- Biotin + Cefalexin Minor
- Biotin + Erythromycin base Minor
- Biotin + Erythromycin ethylsuccinate Minor
Frequently asked questions
Can I take Biotin with Phenobarbital?
MediHelp rates the interaction as minor. Biotin 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. Long-term phenobarbital therapy has been associated with lower biotin concentrations. The clinical consequence is uncertain, but deficiency could contribute to skin, hair or neurological symptoms in prolonged use.
How serious is the interaction between Biotin 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: No routine action is required; consider biotin supplementation if signs of deficiency appear during long-term therapy. Avoid interpreting biotin-sensitive lab assays without considering supplement intake.
What other medicines interact with Biotin?
MediHelp also lists interactions of Biotin with, for example, Levothyroxine, Azithromycin, Carbamazepine. The full list is on the Biotin page.
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