23 Jun 2010
Metformin has an elimination half-life of approximately 17.6 hours.
It takes approximately 5.5 x elimination half life's for a medicine to be cleared from your system, therefore it'll be in your system for that long.
So metformin will be in your system for 96.8 hours i.e. 4 days (5.5 x 17.6 hours).
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