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VIVUS, Inc.
The main difference among the three is in how long they last. Viagra is supposed to work for between 30 minutes and four hours; Levitra for 30 minutes to two hours, and Cialis for up to 36 hours. In addition, Viagra is slightly less effective if taken with food; Viagra can also cause temporary abnormalities of …
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Natural Alternatives to Cialis - Gazette Review
The worldwide sales in 2006 of PDE5 inhibitor products for ED were in excess of $3.0 billion, including approximately $1.7 billion in sales of Viagra, approximately $971 million in sales of Cialis and approximately $313 million in sales of Levitra.
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[DOC File]Voice of the Diabetic - National Federation of the …
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The commercial launch of Viagra in the United States in April 1998 significantly decreased demand for MUSE. In February 2003, a new oral medication under the name Cialis was launched in Europe by Lilly ICOS LLC and in Australia and New Zealand by Eli Lilly and Company. Cialis was launched in the United States in January 2004.
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VIVUS, Inc.
Viagra is pharmaceutical product produced by Pfizer. It is a unique chemical compound, used to treat sexual dysfunction in men. Pfizer owns a patent on Viagra, which grants Pfizer the exclusive right to market the chemical compound—no one may make a chemical copy of Viagra for a period of time protected by the patent.
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Natural alternatives to cialis and viagra