The differences between the 3 main ED pills

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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 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. According to http://xlpharmacy.net Vardenafil is a prescription drug used in the treatment of erectile dysfunction. It can assist men with this disorder in achieving and maintaining an erection during sexual activity. It should not be used with types of medicines called nitrates and alpha-blockers because of potentially dangerous interactions with these drugs. Television commercials for the drug also warn that in the event an erection lasts for more than four hours, a condition known as priapism, medical advice should be sought immediately.

Vardenafil was co-marketed by Bayer Pharmaceuticals and GlaxoSmithKline under the trade name Levitra. According to a press release issued by the Bayer group on January 10, 2005, the co-promotion rights of GlaxoSmithKline on Levitra have been "transferred back" to Bayer for major markets in Asia, Europe, Africa, and other areas outside of the United States. Both companies continue to co-promote Levitra in the United States. In Italy, Bayer markets the product as Levitra and GSK markets the product as Vivanza.

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