Drug interactions
OnabotulinumtoxinA + Perphenazine
Severity: Minor
OnabotulinumtoxinA and Perphenazine: minor 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
Perphenazine has anticholinergic properties that may add to the effects of botulinum toxin. This could in theory lead to excessive muscle weakness or systemic anticholinergic symptoms. Clinical evidence is limited.
What this interaction means in plain words
OnabotulinumtoxinA and Perphenazine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
OnabotulinumtoxinA belongs to Musculoskeletal; Perphenazine belongs to Central Nervous System.
Why it happens
Theoretical additive anticholinergic and neuromuscular-blocking effects.
What to do
Use the lowest effective toxin dose and watch for generalized weakness, swallowing or breathing difficulty after injection. Educate the patient to report these symptoms promptly.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Perphenazine
- Ibutilide + Perphenazine Contraindicated
- Perphenazine + Pimozide Contraindicated
- Perphenazine + Thioridazine Contraindicated
- Adagrasib + Perphenazine Major
- Alfentanil + Perphenazine Major
- Amiodarone + Perphenazine Major
Other interactions of OnabotulinumtoxinA
Frequently asked questions
Can I take OnabotulinumtoxinA with Perphenazine?
MediHelp rates the interaction as minor. OnabotulinumtoxinA and Perphenazine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Perphenazine has anticholinergic properties that may add to the effects of botulinum toxin. This could in theory lead to excessive muscle weakness or systemic anticholinergic symptoms. Clinical evidence is limited.
How serious is the interaction between OnabotulinumtoxinA and Perphenazine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use the lowest effective toxin dose and watch for generalized weakness, swallowing or breathing difficulty after injection. Educate the patient to report these symptoms promptly.
What other medicines interact with Perphenazine?
MediHelp also lists interactions of Perphenazine with, for example, Ibutilide, Pimozide, Thioridazine. The full list is on the Perphenazine page.
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