Drug interactions
Carbidopa-levodopa + Loxapine inhaled
Severity: Major
Carbidopa-levodopa and Loxapine inhaled: 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
Loxapine is a dopamine D2 antagonist and can oppose the effect of levodopa, worsening parkinsonian symptoms. Inhaled loxapine is also associated with bronchospasm.
What this interaction means in plain words
Carbidopa-levodopa and Loxapine inhaled 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
Central dopamine D2 receptor blockade antagonizes dopaminergic therapy.
What to do
Avoid in patients with Parkinson disease; use a low-D2 agent such as quetiapine or clozapine for agitation.
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 Loxapine inhaled?
MediHelp rates the interaction as major. Carbidopa-levodopa and Loxapine inhaled 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. Loxapine is a dopamine D2 antagonist and can oppose the effect of levodopa, worsening parkinsonian symptoms. Inhaled loxapine is also associated with bronchospasm.
How serious is the interaction between Carbidopa-levodopa and Loxapine inhaled?
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 patients with Parkinson disease; use a low-D2 agent such as quetiapine or clozapine for agitation.
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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