Cialis, manufactured by Eli Lilly & Co., was found in studies to stay longer in the body than Viagra. Studies suggest that a 20 mg dose of Cialis is active for 24 to 36 hours. In France, where the drug has been on the market for some time, Cialis is called “Le weekend” pill. Levitra is said to start working within 15 minutes, faster than the one hour recommended for Viagra.
http://www.msnbc.com/news/996541.asp...20031449&cp1=1
http://www.msnbc.com/news/996541.asp...20031449&cp1=1
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