Drug interactions
Levodopa + Pimozide
Severity: Major
Levodopa and Pimozide: 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
Pimozide blocks dopamine D2 receptors in the brain and can counteract the antiparkinsonian benefit of levodopa. Parkinsonian symptoms may worsen, and pimozide itself can cause extrapyramidal effects in these patients.
What this interaction means in plain words
Levodopa and Pimozide 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.
Levodopa belongs to Central Nervous System; Pimozide belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism, as central D2 receptor blockade by pimozide opposes dopamine replacement from levodopa.
What to do
Avoid pimozide in patients with Parkinson disease treated with levodopa and choose a different agent for the indication. If an antipsychotic is unavoidable, consider quetiapine or clozapine.
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 Pimozide
- Adagrasib + Pimozide Contraindicated
- Amiodarone + Pimozide Contraindicated
- Amisulpride + Pimozide Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amoxapine + Pimozide Contraindicated
- Anagrelide + 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 Levodopa with Pimozide?
MediHelp rates the interaction as major. Levodopa and Pimozide 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. Pimozide blocks dopamine D2 receptors in the brain and can counteract the antiparkinsonian benefit of levodopa. Parkinsonian symptoms may worsen, and pimozide itself can cause extrapyramidal effects in these patients.
How serious is the interaction between Levodopa and Pimozide?
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 pimozide in patients with Parkinson disease treated with levodopa and choose a different agent for the indication. If an antipsychotic is unavoidable, consider quetiapine or clozapine.
What other medicines interact with Pimozide?
MediHelp also lists interactions of Pimozide with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Pimozide page.
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