Drug interactions
Baclofen + Primidone
Severity: Moderate
Baclofen 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
Both drugs depress the central nervous system, so taking them together can cause more drowsiness, slowed thinking and impaired coordination than either alone. Falls and impaired driving ability are the main practical concerns, especially in older or frail patients.
What this interaction means in plain words
Baclofen 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.
Baclofen belongs to Musculoskeletal; Primidone belongs to Central Nervous System.
Why it happens
Additive CNS depression through GABAergic mechanisms (baclofen as a GABA-B agonist, primidone and its metabolite phenobarbital as barbiturate-type GABA-A potentiators).
What to do
Start baclofen at a low dose and titrate slowly, monitoring for excessive sedation and confusion. Advise patients to avoid driving and alcohol until the response is known.
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 Baclofen
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 Baclofen with Primidone?
MediHelp rates the interaction as moderate. Baclofen 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. Both drugs depress the central nervous system, so taking them together can cause more drowsiness, slowed thinking and impaired coordination than either alone. Falls and impaired driving ability are the main practical concerns, especially in older or frail patients.
How serious is the interaction between Baclofen 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: Start baclofen at a low dose and titrate slowly, monitoring for excessive sedation and confusion. Advise patients to avoid driving and alcohol until the response is known.
What other medicines interact with Baclofen?
MediHelp also lists interactions of Baclofen with, for example, Alfentanil, Amobarbital, Belladonna and opium. The full list is on the Baclofen page.
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