Does Botulinum Toxin Type A Interact with Onabotulinumtoxina?
Botulinum Toxin Type A and Onabotulinumtoxina have a major drug interaction according to U.S. FDA drug labeling data. Administration at the same time or within several months may cause excessive neuromuscular weakness. Effect is unknown and weakness may be exacerbated. The mechanism involves additive neuromuscular blocking effects. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.
- Severity
- Major
- Botulinum Toxin Type A Class
- Acetylcholine Release Inhibitor
- Onabotulinumtoxina Class
- Acetylcholine Release Inhibitor
- Management
- Close medical supervision required
- Data Source
- U.S. FDA via OpenFDA
How This Interaction Works
The interaction between Botulinum Toxin Type A and Onabotulinumtoxina occurs because additive neuromuscular blocking effects. Clinically, this means administration at the same time or within several months may cause excessive neuromuscular weakness. effect is unknown and weakness may be exacerbated. This is classified as a major interaction, meaning it could cause serious harm if not properly managed. Your healthcare provider may need to adjust dosages, substitute one medication, or increase monitoring frequency.
What To Tell Your Doctor or Pharmacist
If you are taking Botulinum Toxin Type A and your doctor is considering prescribing Onabotulinumtoxina (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask how frequently you should be monitored while these are co-prescribed
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider