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TadalafilCialis® (generic name, tadalafil) is the brand name of a drug used to treat male erectile dysfunction (impotence), developed by the biotech firm ICOS and marketed worldwide by Eli Lilly. Cialis has FDA approval and appeared in U.S. stores in December, 2003. Cialis has a multiyear promotional deal with professional golf's PGA TOUR. The tablets are yellow and oval-shaped. Cialis's main selling points are that it works for up to 36 hours after being swallowed and that it can be taken with or without food (Viagra works for some 4 hours). It has the same mode of action as sildenafil (Viagra), and vardenafil (Levitra). Common side effects with Cialis include headache, upset stomach, back pain, and muscle aches, the last two usually coming 12–24 hours after taking the drug. These side effects usually go away after a few hours, though back pain and muscle aches may take as long as 48 hours. Men taking nitrates or alpha blockers should not take Cialis because it could cause blood pressure problems. Some of the side effects of the drug include back ache, stomach ache, muscle aches, or headaches. The company advises that in the rare event that an erection lasts for more than four hours (a condition called priapism), the man should seek emergency medical attention. Commercial competitors External links
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