Drug interactions
Fluphenazine + Levodopa
Severity: Major
Fluphenazine and Levodopa: 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
Fluphenazine blocks dopamine D2 receptors and can reverse the benefit of levodopa, worsening parkinsonian symptoms. Levodopa may also worsen psychosis.
What this interaction means in plain words
Fluphenazine and 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.
Fluphenazine belongs to Central Nervous System; Levodopa belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism at central dopamine D2 receptors.
What to do
Avoid fluphenazine in Parkinson disease; use low-dose quetiapine or clozapine if an antipsychotic is needed.
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 Fluphenazine
- Arsenic trioxide + Fluphenazine Contraindicated
- Dofetilide + Fluphenazine Contraindicated
- Fluphenazine + Ibutilide Contraindicated
- Fluphenazine + Pimozide Contraindicated
- Adagrasib + Fluphenazine Major
- Alfentanil + Fluphenazine Major
Other interactions of Levodopa
- Isocarboxazid + Levodopa Contraindicated
- Levodopa + Phenelzine Contraindicated
- Levodopa + Phenelzine (nonselective MAOI) Contraindicated
- Levodopa + Procarbazine Contraindicated
- Levodopa + Tranylcypromine Contraindicated
- Amisulpride + Levodopa Major
Frequently asked questions
Can I take Fluphenazine with Levodopa?
MediHelp rates the interaction as major. Fluphenazine and 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. Fluphenazine blocks dopamine D2 receptors and can reverse the benefit of levodopa, worsening parkinsonian symptoms. Levodopa may also worsen psychosis.
How serious is the interaction between Fluphenazine and 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 fluphenazine in Parkinson disease; use low-dose quetiapine or clozapine if an antipsychotic is needed.
What other medicines interact with Fluphenazine?
MediHelp also lists interactions of Fluphenazine with, for example, Arsenic trioxide, Dofetilide, Ibutilide. The full list is on the Fluphenazine page.
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