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	Cialis History	502 dagen geleden
	History The history of Cialis http://canamedic.com/in.cgi?2 cannot be discussed without mentioning Viagra (sildenafil), Pfizer's impotence drug. The FDA's approval of Viagra on 27 March 1998 was a ground-breaking commercial event for the treatment of impotence; sales exceeded a billion dollars. Subsequently, the FDA approved Levitra (vardenafil) on 19 August 2003, and Cialis http://canamedic.com/in.cgi?2 (tadalafil) on 21 November 2003. In 1993, the Bothell, Washington, biotechnology company ICOS Corporation began studying compound IC351, a phosphodiesterase type 5 (PDE5) enzyme inhibitor. In 1994, Pfizer scientists discovered that sildenafil citrate, which also inhibits the PDE5 enzyme, caused penile erection in men participating in a clinical study of a heart medicine. Although ICOS scientists were not testing compound IC351 for treating impotence, they recognized its potential usefulness for treating said disorder. Soon, in 1994, ICOS received a patent for compound IC351 (structurally unlike sildenafil and vardenafil), and Phase 1 clinical trials began in 1995. In 1997, the Phase 2 clinical studies were initiated for impotent men, then progressed to the Phase 3 trials that supported the drug's FDA approval. In 1998, ICOS Corporation and Eli Lilly and Company formed the Lilly ICOS, LLC, joint venture company to further develop and commercialize tadalafil as a treatment for erectile dysfunction. Two years later, Lilly ICOS, LLC, filed a New Drug Application with the FDA for compound IC351 (under the tadalafil generic name, and the Cialis http://canamedic.com/in.cgi?2 brand name). In May of 2002, Lilly ICOS reported to the American Urological Association that clinical trial testing demonstrated that tadalafil works for up to 36 hours; one year later, the FDA approved tadalafil. One advantage Cialis http://canamedic.com/in.cgi?2 has over Viagra and Levitra is its 17.50-hour half-life [1] (thus Cialis http://canamedic.com/in.cgi?2 is advertised to work for up to 36 hours, after which time there remains ca. 25% of the absorbed dose in the body) when compared to the 4.0-hour half-life of sildenafil (Viagra). [2][3] In 2007, Eli Lilly and Company bought the ICOS Corporation for $2.3 billion dollars. As a result, Eli Lilly owned Cialis http://canamedic.com/in.cgi?2 and then closed the ICOS operations, ending the joint venture and firing most of ICOS's ca. 500 employees, except for 127 employees of the ICOS biologics facility, which subsequently was bought by CMC Biopharmaceuticals A/S(CMC). Persons surnamed "Cialis" objected to Eli Lilly and Company's so naming the drug, but the company insisted that the drug's trade name is unrelated to the surname. [4] [edit]Mechanism of action Although Sildenafil (Viagra) and Vardenafi (Levitra), and Cialis http://canamedic.com/in.cgi?2 (Cialis) all work by inhibiting PDE5, Cialis's pharmacologic distinction is its longer half-life (17.50 hours) — compared to Viagra (4.0–5.0 hours) and Levitra (4.0–5.0 hours) — resulting in longer duration of action, and so partly responsible for "The Weekend Pill" sobriquet. Furthermore, the longer half-life is the basis for current investigation of Cialis's daily therapeutic use in relieving pulmonary arterial hypertension. Currently, sildenafil (trade name Revatio) is approved in several world regions as a thrice-daily therapy for pulmonary arterial hypertension. Penile erection during sexual stimulation is caused by increased penile blood flow resulting from the relaxation of penile arteries and the smooth muscle of the corpus cavernosum. This response is mediated by the release of nitric oxide (NO) from nerve terminals and endothelial cells, which stimulates the synthesis of cGMP in smooth muscle cells. Cyclic GMP relaxes smooth muscle and increases blood flow to the corpus cavernosum. The inhibition of phosphodiesterase type 5 (PDE5) enhances erectile function by increasing the amount of cGMP. Cialis http://canamedic.com/in.cgi?2 (and Sildenafil and Vardenafil) inhibits PDE5, however, because sexual stimulation is required to initiate the local penile release of nitric oxide, Cialis's inhibition of PDE5 will have no effect without direct sexual stimulation of the penis. The recommended Cialis http://canamedic.com/in.cgi?2 starting dose for most men is 10mg, taken as needed before sexual activity, (but not more than once daily). The dose may be increased to 20mg or decreased to 5mg, per its efficacy and the man's personal tolerance of the drug. To avoid the inconvenience of a man having to program and plan using Cialis http://canamedic.com/in.cgi?2 around the time of his anticipated sexual activity, Lilly ICOS began a clinical development program to evaluate the risks and benefits chronic, once-daily use of the drug. In June 2007, the European Commission approved low-dose (2.5mg and 5 mg) Cialis http://canamedic.com/in.cgi?2 to be used as single-daily impotence therapy. Moreover, Cialis http://canamedic.com/in.cgi?2 currently is in clinical trials for treating pulmonary arterial hypertension. In some patients, there exists an imbalance of the PDE5/NO system in the pulmonary vasculature that favours selective vasoconstriction of the pulmonary arteries. Investigation of Cialis http://canamedic.com/in.cgi?2 in this disease presumes that inhibiting PDE5 will effect pulmonary artery vasodilation, thus lowering pulmonary arterial pressure and pulmonary vascular resistance. These physiologic changes may then reduce the workload of the right heart's right ventricle. Right heart failure and pulmonary oedema are the principal consequences of pulmonary arterial hypertension.
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