Levitra is metabolized preponderantly by the hepatic enzyme CYP3A4, with donation from the CYP3A5 and CYP2C isoforms. The Major circulating metabolite, M1, results from desethylation at the piperazine mediety of Levitra. The plasm assiduousness of M1 is close to 26% that of the parent heighten. This metabolite shows a phosphodiesterase selectivity profile exchangeable to that of Levitra and BUY XANAX ONLINE an in vitro repressive authorisation for PDE5 28% of that of vardenafil. Therefore, M1 accounts for some 7% of sum up medicine activity. Excretory organ dialysis is not likely to speed up clearance as vardenafil is highly bound to plasm proteins and not importantly eliminated in the weewee. Do non employ Levitra in patients on renal dialysis as Levitra has non been evaluated in so much patients. LEVITRA is indicated for the treatment of erectile disfunction.