Drug interactions
Gentamicin + OnabotulinumtoxinA
Severity: Major
Gentamicin and OnabotulinumtoxinA: 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
Aminoglycosides impair neuromuscular transmission and can potentiate the effect of botulinum toxin. This may lead to excessive muscle weakness, including swallowing and breathing difficulty, and may be delayed after injection.
What this interaction means in plain words
Gentamicin and OnabotulinumtoxinA 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.
Gentamicin belongs to Anti Bacterial; OnabotulinumtoxinA belongs to Musculoskeletal.
Why it happens
Additive inhibition of neuromuscular transmission, with aminoglycosides reducing presynaptic acetylcholine release.
What to do
Avoid aminoglycosides around the time of botulinum toxin treatment when alternatives exist. If both are needed, monitor closely for generalized weakness, dysphagia and respiratory compromise.
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 Gentamicin
- Cidofovir + Gentamicin Contraindicated
- Adefovir + Gentamicin Major
- Amikacin + Gentamicin Major
- Amlodipine-hydrochlorothiazide-valsartan + Gentamicin Major
- Amphotericin b deoxycholate + Gentamicin Major
- Amphotericin b + Gentamicin Major
Other interactions of OnabotulinumtoxinA
- Amikacin + OnabotulinumtoxinA Major
- OnabotulinumtoxinA + Streptomycin Major
- Atracurium + OnabotulinumtoxinA Moderate
- Atropine + OnabotulinumtoxinA Moderate
- Baclofen + OnabotulinumtoxinA Moderate
- Benztropine + OnabotulinumtoxinA Moderate
Frequently asked questions
Can I take Gentamicin with OnabotulinumtoxinA?
MediHelp rates the interaction as major. Gentamicin and OnabotulinumtoxinA 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. Aminoglycosides impair neuromuscular transmission and can potentiate the effect of botulinum toxin. This may lead to excessive muscle weakness, including swallowing and breathing difficulty, and may be delayed after injection.
How serious is the interaction between Gentamicin and OnabotulinumtoxinA?
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 aminoglycosides around the time of botulinum toxin treatment when alternatives exist. If both are needed, monitor closely for generalized weakness, dysphagia and respiratory compromise.
What other medicines interact with Gentamicin?
MediHelp also lists interactions of Gentamicin with, for example, Cidofovir, Adefovir, Amikacin. The full list is on the Gentamicin page.
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