Drug interactions
Dextroamphetamine + Primidone
Severity: Moderate
Dextroamphetamine and Primidone: 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
Primidone, which is metabolized to phenobarbital, causes sedation, while dextroamphetamine is stimulating, so the net effect is unpredictable. Enzyme induction by primidone may also alter other drug exposures.
What this interaction means in plain words
Dextroamphetamine and Primidone 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.
Dextroamphetamine belongs to Central Nervous System; Primidone belongs to Central Nervous System.
Why it happens
Opposing CNS effects, with possible hepatic enzyme induction by primidone and its phenobarbital metabolite.
What to do
Monitor seizure control, sedation and clinical response. Adjust doses as needed.
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 Dextroamphetamine
- Dextroamphetamine + Isocarboxazid Contraindicated
- Dextroamphetamine + Linezolid Contraindicated
- Dextroamphetamine + Methylene blue Contraindicated
- Dextroamphetamine + Phenelzine Contraindicated
- Dextroamphetamine + Rasagiline Contraindicated
- Dextroamphetamine + Safinamide Contraindicated
Other interactions of Primidone
- Lorlatinib + Primidone Contraindicated
- Lurasidone + Primidone Contraindicated
- Primidone + Ranolazine Contraindicated
- Primidone + Sofosbuvir-velpatasvir-voxilaprevir Contraindicated
- Primidone + Voriconazole Contraindicated
- Abiraterone + Primidone Major
Frequently asked questions
Can I take Dextroamphetamine with Primidone?
MediHelp rates the interaction as moderate. Dextroamphetamine and Primidone 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. Primidone, which is metabolized to phenobarbital, causes sedation, while dextroamphetamine is stimulating, so the net effect is unpredictable. Enzyme induction by primidone may also alter other drug exposures.
How serious is the interaction between Dextroamphetamine and Primidone?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor seizure control, sedation and clinical response. Adjust doses as needed.
What other medicines interact with Dextroamphetamine?
MediHelp also lists interactions of Dextroamphetamine with, for example, Isocarboxazid, Linezolid, Methylene blue. The full list is on the Dextroamphetamine page.
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