The most commonly reported side effects of dantrolene include neuroleptic malignant syndrome, off label use, and asthenia, based on 1,758 FDA adverse event reports from 2004 to 2025. 7.8% of reports found the drug to be ineffective.
Percentages show how often each reaction appears relative to total reports for dantrolene.
These are voluntary reports and do not establish that dantrolene caused these reactions.
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Other drugs that appear in adverse event reports alongside dantrolene. 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.
43.1% of dantrolene adverse event reports involve female patients and 49.4% involve male patients. The largest age group is adult at 66%. These figures reflect who reports side effects, not underlying risk.
Sex
Age group
Conditions and purposes for which patients were taking dantrolene when the adverse event was reported.
Showing 15 of 155 indications
Dantrolene is sold under the brand name Dantrium.
An upward trend reflects increased FAERS reporting overall, not necessarily increased risk.
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