The most commonly reported side effects of methicillin include chronic kidney disease, acute kidney injury, and drug resistance, based on 34 FDA adverse event reports from 2004 to 2025. 11.8% of reports found the drug to be ineffective.
Percentages show how often each reaction appears relative to total reports for methicillin.
These are voluntary reports and do not establish that methicillin caused these reactions.
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Other drugs that appear in adverse event reports alongside methicillin. 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.
44.1% of methicillin adverse event reports involve female patients and 38.2% involve male patients. The largest age group is adult at 48%. These figures reflect who reports side effects, not underlying risk.
Sex
Age group
Conditions and purposes for which patients were taking methicillin when the adverse event was reported.
Methicillin is sold under the brand name Staphcillin.
An upward trend reflects increased FAERS reporting overall, not necessarily increased risk.
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