Drug interactions
Haloperidol + Levodopa
Severity: Major
Haloperidol and Levodopa: major 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
Haloperidol blocks dopamine receptors and opposes the antiparkinsonian effect of levodopa, which may worsen motor symptoms. Haloperidol can also cause drug-induced parkinsonism.
What this interaction means in plain words
Haloperidol and Levodopa 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.
Haloperidol belongs to Central Nervous System; Levodopa belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism through central dopamine D2 receptor blockade by haloperidol.
What to do
Avoid haloperidol in Parkinson disease and use quetiapine or clozapine if an antipsychotic is needed. Monitor motor function closely.
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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Other interactions of Haloperidol
- Dofetilide + Haloperidol Contraindicated
- Dronedarone + Haloperidol Contraindicated
- Haloperidol + Ibutilide Contraindicated
- Haloperidol + Levoketoconazole Contraindicated
- Haloperidol + Panobinostat Contraindicated
- Haloperidol + Pimozide Contraindicated
Other interactions of Levodopa
- Isocarboxazid + Levodopa Contraindicated
- Levodopa + Phenelzine Contraindicated
- Levodopa + Phenelzine (nonselective MAOI) Contraindicated
- Levodopa + Procarbazine Contraindicated
- Levodopa + Tranylcypromine Contraindicated
- Amisulpride + Levodopa Major
Frequently asked questions
Can I take Haloperidol with Levodopa?
MediHelp rates the interaction as major. Haloperidol and Levodopa 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. Haloperidol blocks dopamine receptors and opposes the antiparkinsonian effect of levodopa, which may worsen motor symptoms. Haloperidol can also cause drug-induced parkinsonism.
How serious is the interaction between Haloperidol and Levodopa?
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 haloperidol in Parkinson disease and use quetiapine or clozapine if an antipsychotic is needed. Monitor motor function closely.
What other medicines interact with Haloperidol?
MediHelp also lists interactions of Haloperidol with, for example, Dofetilide, Dronedarone, Ibutilide. The full list is on the Haloperidol page.
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