Drug interactions
Asenapine transdermal + Carbidopa-entacapone-levodopa
Severity: Major
Asenapine transdermal and Carbidopa-entacapone-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
Asenapine is a dopamine antagonist and can oppose the effect of levodopa, worsening parkinsonian symptoms. Additive sedation and orthostatic hypotension can also occur.
What this interaction means in plain words
Asenapine transdermal and Carbidopa-entacapone-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.
Why it happens
Pharmacodynamic antagonism at dopamine D2 receptors plus additive sedative and hypotensive effects.
What to do
Avoid in Parkinson's disease where possible; if an antipsychotic is needed, use quetiapine or clozapine 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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Other interactions of Carbidopa-entacapone-levodopa
- Carbidopa-entacapone-levodopa + Isocarboxazid Contraindicated
- Carbidopa-entacapone-levodopa + Phenelzine Contraindicated
- Carbidopa-entacapone-levodopa + Selegiline transdermal Contraindicated
- Carbidopa-entacapone-levodopa + Tranylcypromine Contraindicated
- Amisulpride + Carbidopa-entacapone-levodopa Major
- Carbidopa-entacapone-levodopa + Chlorpromazine Major
Frequently asked questions
Can I take Asenapine transdermal with Carbidopa-entacapone-levodopa?
MediHelp rates the interaction as major. Asenapine transdermal and Carbidopa-entacapone-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. Asenapine is a dopamine antagonist and can oppose the effect of levodopa, worsening parkinsonian symptoms. Additive sedation and orthostatic hypotension can also occur.
How serious is the interaction between Asenapine transdermal and Carbidopa-entacapone-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 in Parkinson's disease where possible; if an antipsychotic is needed, use quetiapine or clozapine and monitor motor function.
What other medicines interact with Carbidopa-entacapone-levodopa?
MediHelp also lists interactions of Carbidopa-entacapone-levodopa with, for example, Isocarboxazid, Phenelzine, Selegiline transdermal. The full list is on the Carbidopa-entacapone-levodopa page.
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