Drug interactions
Diazepam + Haloperidol
Severity: Moderate
Diazepam and Haloperidol: 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
Concurrent use adds sedation and may increase hypotension and respiratory depression. The combination is common in acute agitation and is generally manageable with monitoring.
What this interaction means in plain words
Diazepam and Haloperidol 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.
Diazepam belongs to Musculoskeletal; Haloperidol belongs to Central Nervous System.
Why it happens
Additive CNS depression through GABA-A potentiation and dopamine D2 antagonism.
What to do
Titrate doses carefully and monitor sedation, respiratory rate and blood pressure after parenteral administration.
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 Diazepam
Other interactions of Haloperidol
- Dofetilide + Haloperidol Contraindicated
- Dronedarone + Haloperidol Contraindicated
- Haloperidol + Ibutilide Contraindicated
- Haloperidol + Levoketoconazole Contraindicated
- Haloperidol + Panobinostat Contraindicated
- Haloperidol + Pimozide Contraindicated
Frequently asked questions
Can I take Diazepam with Haloperidol?
MediHelp rates the interaction as moderate. Diazepam and Haloperidol 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. Concurrent use adds sedation and may increase hypotension and respiratory depression. The combination is common in acute agitation and is generally manageable with monitoring.
How serious is the interaction between Diazepam and Haloperidol?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Titrate doses carefully and monitor sedation, respiratory rate and blood pressure after parenteral administration.
What other medicines interact with Diazepam?
MediHelp also lists interactions of Diazepam with, for example, Calcium / magnesium / potassium / sodium oxybates, Alfentanil, Alprazolam. The full list is on the Diazepam page.
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