The most commonly reported side effects of cantharidin include application site vesicles, application site pain, and blister, based on 153 FDA adverse event reports from 2011 to 2025. 2.6% of reports found the drug to be ineffective.
Percentages show how often each reaction appears relative to total reports for cantharidin.
These are voluntary reports and do not establish that cantharidin caused these reactions.
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Other drugs that appear in adverse event reports alongside cantharidin. 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.
27.5% of cantharidin adverse event reports involve female patients and 28.1% involve male patients. The largest age group is child at 63%. These figures reflect who reports side effects, not underlying risk.
Sex
Age group
Conditions and purposes for which patients were taking cantharidin when the adverse event was reported.
Showing 15 of 22 indications
Cantharidin is sold under the brand name Ycanth.
An upward trend reflects increased FAERS reporting overall, not necessarily increased risk.
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