Drug interactions
Asenapine + Carbidopa-levodopa
Severity: Major
Asenapine and Carbidopa-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 blocks dopamine receptors and may antagonize the antiparkinsonian effect of levodopa, while both drugs can cause orthostatic hypotension. The combination may worsen parkinsonian symptoms and increase dizziness or falls.
What this interaction means in plain words
Asenapine and Carbidopa-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 belongs to Central Nervous System; Carbidopa-levodopa belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism at dopamine D2 receptors, plus additive orthostatic hypotension through alpha-1 blockade and levodopa effects.
What to do
Avoid in Parkinson disease if possible, preferring low-D2-affinity agents such as quetiapine or clozapine when an antipsychotic is needed; monitor motor function and orthostatic blood pressure.
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-levodopa
- Carbidopa-levodopa + Isocarboxazid Contraindicated
- Carbidopa-levodopa + Phenelzine Contraindicated
- Carbidopa-levodopa + Selegiline transdermal Contraindicated
- Carbidopa-levodopa + Tranylcypromine Contraindicated
- Amisulpride + Carbidopa-levodopa Major
- Carbidopa-levodopa + Chlorpromazine Major
Other interactions of Asenapine
- Asenapine + Pimozide Contraindicated
- Asenapine + Thioridazine Contraindicated
- Asenapine + Vandetanib Contraindicated
- Adagrasib + Asenapine Major
- Alfentanil + Asenapine Major
- Alfuzosin + Asenapine Major
Frequently asked questions
Can I take Asenapine with Carbidopa-levodopa?
MediHelp rates the interaction as major. Asenapine and Carbidopa-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 blocks dopamine receptors and may antagonize the antiparkinsonian effect of levodopa, while both drugs can cause orthostatic hypotension. The combination may worsen parkinsonian symptoms and increase dizziness or falls.
How serious is the interaction between Asenapine and Carbidopa-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 disease if possible, preferring low-D2-affinity agents such as quetiapine or clozapine when an antipsychotic is needed; monitor motor function and orthostatic blood pressure.
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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