Drug interactions
Dimenhydrinate + Pentobarbital
Severity: Moderate
Dimenhydrinate and Pentobarbital: 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
Combining a barbiturate with a sedating antihistamine intensifies sedation and may cause profound CNS depression, impaired psychomotor function and reduced respiratory drive.
What this interaction means in plain words
Dimenhydrinate and Pentobarbital 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.
Why it happens
Additive CNS depression from GABA-A potentiation and central H1 blockade.
What to do
Use the lowest effective barbiturate dose and monitor level of consciousness and respiration. Avoid additional sedatives and alcohol.
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
Frequently asked questions
Can I take Dimenhydrinate with Pentobarbital?
MediHelp rates the interaction as moderate. Dimenhydrinate and Pentobarbital 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. Combining a barbiturate with a sedating antihistamine intensifies sedation and may cause profound CNS depression, impaired psychomotor function and reduced respiratory drive.
How serious is the interaction between Dimenhydrinate and Pentobarbital?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use the lowest effective barbiturate dose and monitor level of consciousness and respiration. Avoid additional sedatives and alcohol.
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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