Drug interactions
Lisdexamfetamine + Primidone
Severity: Moderate
Lisdexamfetamine 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 is a sedating anticonvulsant, whereas lisdexamfetamine is a stimulant that may offset drowsiness. Stimulants can also lower seizure threshold in some patients, which may reduce seizure control. Primidone induces CYP enzymes, but this has little known effect on amphetamine exposure.
What this interaction means in plain words
Lisdexamfetamine 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.
Lisdexamfetamine belongs to Central Nervous System; Primidone belongs to Central Nervous System.
Why it happens
Opposing CNS effects, with a possible stimulant-related reduction in seizure threshold counteracting anticonvulsant action.
What to do
Monitor seizure frequency after starting or increasing lisdexamfetamine in patients with epilepsy. Adjust anticonvulsant therapy if seizure control worsens.
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 Lisdexamfetamine
- Isocarboxazid + Lisdexamfetamine Contraindicated
- Linezolid + Lisdexamfetamine Contraindicated
- Lisdexamfetamine + Phenelzine Contraindicated
- Lisdexamfetamine + Procarbazine Contraindicated
- Lisdexamfetamine + Rasagiline Contraindicated
- Lisdexamfetamine + 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 Lisdexamfetamine with Primidone?
MediHelp rates the interaction as moderate. Lisdexamfetamine 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 is a sedating anticonvulsant, whereas lisdexamfetamine is a stimulant that may offset drowsiness. Stimulants can also lower seizure threshold in some patients, which may reduce seizure control. Primidone induces CYP enzymes, but this has little known effect on amphetamine exposure.
How serious is the interaction between Lisdexamfetamine 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 frequency after starting or increasing lisdexamfetamine in patients with epilepsy. Adjust anticonvulsant therapy if seizure control worsens.
What other medicines interact with Lisdexamfetamine?
MediHelp also lists interactions of Lisdexamfetamine with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Lisdexamfetamine page.
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