Drug interactions
Carbidopa-levodopa + Ziprasidone
Severity: Major
Carbidopa-levodopa and Ziprasidone: major interaction.
Last updated Sources: US FDA label
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
Ziprasidone antagonizes dopamine D2 receptors and may blunt the response to levodopa, leading to worsening parkinsonism. The effect is documented for antipsychotics as a class.
What this interaction means in plain words
Carbidopa-levodopa and Ziprasidone 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.
Carbidopa-levodopa belongs to Central Nervous System; Ziprasidone belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism: D2 receptor blockade opposes the effect of levodopa-derived dopamine.
What to do
Avoid ziprasidone where possible in Parkinson disease; use quetiapine or clozapine instead and monitor motor function.
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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References
Other interactions of Carbidopa-levodopa
- Carbidopa-levodopa + Isocarboxazid Contraindicated
- Carbidopa-levodopa + Phenelzine Contraindicated
- Carbidopa-levodopa + Selegiline transdermal Contraindicated
- Carbidopa-levodopa + Tranylcypromine Contraindicated
- Amisulpride + Carbidopa-levodopa Major
- Asenapine + Carbidopa-levodopa Major
Other interactions of Ziprasidone
- Amiodarone + Ziprasidone Contraindicated
- Amitriptyline + Ziprasidone Contraindicated
- Arsenic trioxide + Ziprasidone Contraindicated
- Bedaquiline + Ziprasidone Contraindicated
- Chloroquine + Ziprasidone Contraindicated
- Citalopram + Ziprasidone Contraindicated
Frequently asked questions
Can I take Carbidopa-levodopa with Ziprasidone?
MediHelp rates the interaction as major. Carbidopa-levodopa and Ziprasidone 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. Ziprasidone antagonizes dopamine D2 receptors and may blunt the response to levodopa, leading to worsening parkinsonism. The effect is documented for antipsychotics as a class.
How serious is the interaction between Carbidopa-levodopa and Ziprasidone?
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 ziprasidone where possible in Parkinson disease; use quetiapine or clozapine instead and monitor motor function.
What other medicines interact with Carbidopa-levodopa?
MediHelp also lists interactions of Carbidopa-levodopa with, for example, Isocarboxazid, Phenelzine, Selegiline transdermal. The full list is on the Carbidopa-levodopa page.
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