Drug interactions
Carbidopa-levodopa + Thiothixene
Severity: Major
Carbidopa-levodopa and Thiothixene: 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
Thiothixene is a typical antipsychotic that blocks D2 receptors, directly opposing levodopa. This can reduce levodopa efficacy and worsen parkinsonism, and the antipsychotic itself can cause extrapyramidal symptoms.
What this interaction means in plain words
Carbidopa-levodopa and Thiothixene 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.
Why it happens
Pharmacodynamic antagonism through D2 dopamine receptor blockade.
What to do
Avoid in Parkinson disease; if psychosis needs treatment, use quetiapine or clozapine. If unavoidable, 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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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
Frequently asked questions
Can I take Carbidopa-levodopa with Thiothixene?
MediHelp rates the interaction as major. Carbidopa-levodopa and Thiothixene 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. Thiothixene is a typical antipsychotic that blocks D2 receptors, directly opposing levodopa. This can reduce levodopa efficacy and worsen parkinsonism, and the antipsychotic itself can cause extrapyramidal symptoms.
How serious is the interaction between Carbidopa-levodopa and Thiothixene?
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 in Parkinson disease; if psychosis needs treatment, use quetiapine or clozapine. If unavoidable, monitor motor function closely.
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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