27 Oct 2010
Erythromycin has an elimination half life of approximately 1.5 hours. It takes 5.5 x elimination half lifes for a medicine to be out of ones system. So erythromycin should be out of your system in 5.5 x 1.5 hour (8.25 hours). You could starting taking Cafergot from the next day after you stop eryhthromycin.
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