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Use of protamine sulphate as an antidote to heparin

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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The effects of heparin can be reversed by protamine sulphate.

Approximately 1 mg of protamine sulphate neutralizes 100 iu of heparin. This dose can be calculated on this basis if protamine sulphate is given within 15 minutes of a single dose of heparin.

Protamine sulphate should not be administered in doses above 50 mg. It should be given slowly, intravenously, to avoid side effects such as hypotension, nausea, vomiting and flushing. Allergic reactions have been reported.


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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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