Drug interactions
Methylphenidate + Phenobarbital
Severity: Moderate
Methylphenidate and Phenobarbital: 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
Methylphenidate may raise phenobarbital concentrations, and this has been described mainly with related anticonvulsants. The effect is inconsistent, but sedation or toxicity could occur, and levels may fall when methylphenidate is stopped.
What this interaction means in plain words
Methylphenidate and Phenobarbital 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.
Why it happens
Proposed inhibition of anticonvulsant metabolism by methylphenidate; the mechanism is not firmly established.
What to do
Check phenobarbital serum levels and watch for sedation or ataxia when methylphenidate is started, increased or stopped. Reduce the phenobarbital dose if levels are high.
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 Methylphenidate
- Isocarboxazid + Methylphenidate Contraindicated
- Linezolid + Methylphenidate Contraindicated
- Methylphenidate + Phenelzine Contraindicated
- Methylphenidate + Procarbazine Contraindicated
- Methylphenidate + Rasagiline Contraindicated
- Methylphenidate + Safinamide Contraindicated
Frequently asked questions
Can I take Methylphenidate with Phenobarbital?
MediHelp rates the interaction as moderate. Methylphenidate and Phenobarbital 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. Methylphenidate may raise phenobarbital concentrations, and this has been described mainly with related anticonvulsants. The effect is inconsistent, but sedation or toxicity could occur, and levels may fall when methylphenidate is stopped.
How serious is the interaction between Methylphenidate and Phenobarbital?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check phenobarbital serum levels and watch for sedation or ataxia when methylphenidate is started, increased or stopped. Reduce the phenobarbital dose if levels are high.
What other medicines interact with Methylphenidate?
MediHelp also lists interactions of Methylphenidate with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Methylphenidate page.
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