Drug interactions
Phenobarbital + Vitamin c
Severity: Minor
Phenobarbital and Vitamin c: 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 may lower ascorbic acid levels, possibly through enhanced elimination. Clinical consequences are not established.
What this interaction means in plain words
Phenobarbital and Vitamin c 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
Possible barbiturate-related enhancement of ascorbic acid turnover or elimination; the mechanism is not firmly established.
What to do
No routine action is needed; ensure adequate vitamin C intake in chronic phenobarbital users.
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 Vitamin c
Frequently asked questions
Can I take Phenobarbital with Vitamin c?
MediHelp rates the interaction as minor. Phenobarbital and Vitamin c 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 may lower ascorbic acid levels, possibly through enhanced elimination. Clinical consequences are not established.
How serious is the interaction between Phenobarbital and Vitamin c?
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 needed; ensure adequate vitamin C intake in chronic phenobarbital users.
What other medicines interact with Vitamin c?
MediHelp also lists interactions of Vitamin c with, for example, Deferoxamine, Aluminum hydroxide, Dextroamphetamine transdermal. The full list is on the Vitamin c page.
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