The most commonly reported side effects of fenfluramine include seizure, off label use, and decreased appetite, based on 4,777 FDA adverse event reports from 2004 to 2025. 14.6% of reports found the drug to be ineffective.
Percentages show how often each reaction appears relative to total reports for fenfluramine.
These are voluntary reports and do not establish that fenfluramine caused these reactions.
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Other drugs that appear in adverse event reports alongside fenfluramine. 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.
35.9% of fenfluramine adverse event reports involve female patients and 38.0% involve male patients. The largest age group is child at 39%. These figures reflect who reports side effects, not underlying risk.
Sex
Age group
Conditions and purposes for which patients were taking fenfluramine when the adverse event was reported.
Showing 15 of 67 indications
Fenfluramine is sold under brand names including Fenfluramine, Fintepla.
An upward trend reflects increased FAERS reporting overall, not necessarily increased risk.
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