The most commonly reported side effects of benzylpenicilloyl include fatigue, headache, and diarrhoea, based on 3,347 FDA adverse event reports from 2004 to 2025. 5.3% of reports found the drug to be ineffective.
Percentages show how often each reaction appears relative to total reports for benzylpenicilloyl.
These are voluntary reports and do not establish that benzylpenicilloyl caused these reactions.
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Other drugs that appear in adverse event reports alongside benzylpenicilloyl. 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.
71.1% of benzylpenicilloyl adverse event reports involve female patients and 22.8% involve male patients. The largest age group is adult at 56%. These figures reflect who reports side effects, not underlying risk.
Sex
Age group
Conditions and purposes for which patients were taking benzylpenicilloyl when the adverse event was reported.
Showing 15 of 110 indications
Benzylpenicilloyl is sold under the brand name Pre-pen.
An upward trend reflects increased FAERS reporting overall, not necessarily increased risk.
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