The most commonly reported side effects of heparin include off label use, heparin-induced thrombocytopenia, and renal failure, based on 71,385 FDA adverse event reports from 2004 to 2025. 4.9% of reports found the drug to be ineffective.
Percentages show how often each reaction appears relative to total reports for heparin.
These are voluntary reports and do not establish that heparin caused these reactions.
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Other drugs that appear in adverse event reports alongside heparin. 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.
41.4% of heparin adverse event reports involve female patients and 44.8% involve male patients. The largest age group is adult at 51%. These figures reflect who reports side effects, not underlying risk.
Sex
Age group
Conditions and purposes for which patients were taking heparin when the adverse event was reported.
Showing 15 of 1,704 indications
Heparin is sold under brand names including Calciparine, Heparin Sodium 20,000 Units In Dextrose 5%.
An upward trend reflects increased FAERS reporting overall, not necessarily increased risk.
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