Drug interactions
Primidone + Rimegepant
Severity: Major
Primidone and Rimegepant: major interaction.
Last updated Sources: US FDA label
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 an inducer of CYP3A4 and can lower rimegepant plasma concentrations. This may reduce its efficacy in acute migraine treatment.
What this interaction means in plain words
Primidone and Rimegepant can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Primidone belongs to Central Nervous System; Rimegepant belongs to Central Nervous System.
Why it happens
Primidone (via its metabolite phenobarbital) induces CYP3A4, increasing the metabolism of rimegepant, a CYP3A4 substrate.
What to do
Avoid concomitant use per rimegepant labeling advising against strong or moderate CYP3A4 inducers. Consider a different acute migraine therapy if primidone is required.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Rimegepant
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 Primidone with Rimegepant?
MediHelp rates the interaction as major. Primidone and Rimegepant can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Primidone is an inducer of CYP3A4 and can lower rimegepant plasma concentrations. This may reduce its efficacy in acute migraine treatment.
How serious is the interaction between Primidone and Rimegepant?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid concomitant use per rimegepant labeling advising against strong or moderate CYP3A4 inducers. Consider a different acute migraine therapy if primidone is required.
What other medicines interact with Rimegepant?
MediHelp also lists interactions of Rimegepant with, for example, Amobarbital, Atazanavir, Butabarbital. The full list is on the Rimegepant page.
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