Drug interactions
Lurasidone + Primidone
Severity: Contraindicated
Lurasidone and Primidone: contraindicated 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 metabolized to phenobarbital, which induces CYP3A4 and may reduce lurasidone concentrations. This can lead to inadequate antipsychotic effect and relapse. Strong CYP3A4 inducers are contraindicated with lurasidone.
What this interaction means in plain words
Lurasidone and Primidone are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Lurasidone belongs to Central Nervous System; Primidone belongs to Central Nervous System.
Why it happens
Induction of CYP3A4 by primidone and its phenobarbital metabolite increases lurasidone clearance.
What to do
Avoid the combination; consider a non-inducing anticonvulsant or an alternative antipsychotic and monitor symptom control.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
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Other interactions of Lurasidone
- Apalutamide + Lurasidone Contraindicated
- Atazanavir + Lurasidone Contraindicated
- Carbamazepine + Lurasidone Contraindicated
- Clarithromycin + Lurasidone Contraindicated
- Cobicistat + Lurasidone Contraindicated
- Conivaptan + Lurasidone Contraindicated
Other interactions of Primidone
- Lorlatinib + Primidone Contraindicated
- Primidone + Ranolazine Contraindicated
- Primidone + Sofosbuvir-velpatasvir-voxilaprevir Contraindicated
- Primidone + Voriconazole Contraindicated
- Abiraterone + Primidone Major
- Amitriptyline + Primidone Major
Frequently asked questions
Can I take Lurasidone with Primidone?
MediHelp rates the interaction as contraindicated. Lurasidone and Primidone are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Primidone is metabolized to phenobarbital, which induces CYP3A4 and may reduce lurasidone concentrations. This can lead to inadequate antipsychotic effect and relapse. Strong CYP3A4 inducers are contraindicated with lurasidone.
How serious is the interaction between Lurasidone and Primidone?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination; consider a non-inducing anticonvulsant or an alternative antipsychotic and monitor symptom control.
What other medicines interact with Lurasidone?
MediHelp also lists interactions of Lurasidone with, for example, Apalutamide, Atazanavir, Carbamazepine. The full list is on the Lurasidone page.
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