History of Tadalafil

The history of Cialis cannot be discussed without mentioning the drug of Pfizer, Viagra. The approval of fDA of 1998 march the 27, lead this drug of the prescription, Viagra, to a success that was broken of earth in as soon as the first year of the introduction like value sold Pfizer of drugs on billion dollars. Nevertheless, the things changed considerably for the giant of eréctiles drugs of the disfunción when the FDA also approved Levitra of August the 19 of 2003, and of Cialis of November the 21 of 2003. In 1993 company Icos the drug began to study IC351, that is an enzymatic inhibitor PDE5, and this one is basically the process with which the eréctiles drugs of the disfunción work. In 1994, scientists of Pfizer discovered that citrato of sildenafil, that is a white crystalline dust that temporarily standardizes the eréctil function of the penis blocking a known enzyme to inhibit the production of a chemical agent that causes erections, caused to patients of the heart which they participated in a clinical study of a medicine of the heart to have erections. Although the scientists did not prove the chemical compound IC351 for the eréctil disfunción, the compound looked like to have an indirect effect that he could potentially be worth million, if not them billion dollars. Soon Icos received his first patent in 1994 in IC351, and the clinical tests of phase 1 happened in 1995. In 1997, it puts in phase 2 clinical studies began and Icos made its first study in patients with the eréctil disfunción. Phase 2 lasted near two years, and that phase 3 began later. In 1998, ICOS Corporation, and Eli Lilly and Company, commercialized the drug for the eréctil disfunción, and two years later filed a new use of the drug with the administration of the food and the drug of the United States for IC351; the only difference was that this time they decided to call the Cialis drug. In May of 2002, Icos and Eli Lilly and Company they disclosed to the American urológica association that the tests of phase 3 demonstrate that Cialis works by up to 36 hours, and a year more late Icos and Eli Lilly and Company del received the approval fDA of STATES UNITED for Cialis. An advantage that Cialis has excessive Viagra is that the tadalafil has a period of 17,5 hours[2 ] (and that Cialis is announced to work by up to 36 hours, moment after as it continues being there near a quarter of the absorbed dose in the body) with respect to 4 hours of period for the sildenafil (Viagra).[3][4 ] Eli Lilly bought the corporation of ICOS for the dollars $2,1 billion in 2006.