Drug interactions
Dimenhydrinate + Primidone
Severity: Moderate
Dimenhydrinate 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, partly metabolized to phenobarbital, is sedating and adds to the drowsiness of dimenhydrinate. This can impair alertness and coordination.
What this interaction means in plain words
Dimenhydrinate 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.
Dimenhydrinate belongs to Respiratory; Primidone belongs to Central Nervous System.
Why it happens
Additive CNS depression.
What to do
Monitor for oversedation and warn about driving and alcohol. Reduce the dose of either drug if excessive drowsiness occurs.
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 Dimenhydrinate
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 Dimenhydrinate with Primidone?
MediHelp rates the interaction as moderate. Dimenhydrinate 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, partly metabolized to phenobarbital, is sedating and adds to the drowsiness of dimenhydrinate. This can impair alertness and coordination.
How serious is the interaction between Dimenhydrinate 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 for oversedation and warn about driving and alcohol. Reduce the dose of either drug if excessive drowsiness occurs.
What other medicines interact with Dimenhydrinate?
MediHelp also lists interactions of Dimenhydrinate with, for example, Belladonna and opium, Brexanolone, Calcium / magnesium / potassium / sodium oxybates. The full list is on the Dimenhydrinate page.
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