The most commonly reported side effects of onabotulinumtoxina include off label use, product preparation error, and therapeutic response decreased, based on 74,693 FDA adverse event reports from 2004 to 2025. 29.0% of reports found the drug to be ineffective.
Percentages show how often each reaction appears relative to total reports for onabotulinumtoxina.
These are voluntary reports and do not establish that onabotulinumtoxina caused these reactions.
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Other drugs that appear in adverse event reports alongside onabotulinumtoxina. Drugs flagged as a suspected cause appear in the first column. Drugs taken at the same time but not suspected appear in the second.
Also suspected
Taken alongside
Co-occurrence in adverse event reports does not establish a drug interaction. Patients often take multiple medications, and these lists reflect prescribing patterns rather than causal relationships. Consult a healthcare provider about potential drug interactions.
72.6% of onabotulinumtoxina adverse event reports involve female patients and 10.5% involve male patients. The largest age group is adult at 83%. These figures reflect who reports side effects, not underlying risk.
Sex
Age group
Conditions and purposes for which patients were taking onabotulinumtoxina when the adverse event was reported.
Showing 15 of 900 indications
Onabotulinumtoxina is sold under the brand name Botox.
An upward trend reflects increased FAERS reporting overall, not necessarily increased risk.
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