The most commonly reported side effects of efgartigimod include myasthenia gravis, myasthenia gravis crisis, and fatigue, based on 4,177 FDA adverse event reports from 2004 to 2025. 5.1% of reports found the drug to be ineffective.
Percentages show how often each reaction appears relative to total reports for efgartigimod.
These are voluntary reports and do not establish that efgartigimod caused these reactions.
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Other drugs that appear in adverse event reports alongside efgartigimod. 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.
15.3% of efgartigimod adverse event reports involve female patients and 12.0% involve male patients. The largest age group is elderly at 52%. These figures reflect who reports side effects, not underlying risk.
Sex
Age group
Conditions and purposes for which patients were taking efgartigimod when the adverse event was reported.
Showing 15 of 53 indications
Efgartigimod is sold under brand names including Vyvgart, Vyvgart Hytrulo.
An upward trend reflects increased FAERS reporting overall, not necessarily increased risk.
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