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Although sildenafil (Viagra), vardenafil (Levitra), and tadalafil (Cialis) all work by inhibiting PDE5, tadalafil's pharmacologic distinction is its longer half-life (17.50 hours) [4] – compared to sildenafil and vardenafil (both 4.0–5.0 hours)[5] – 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 tadalafil's daily therapeutic use in relieving pulmonary arterial hypertension. Sildenafil is approved in several world regions as a thrice-daily therapy for pulmonary arterial hypertension. cialis daily use side effects Many illegitimate pharmacies sell counterfeit Viagra for extremely low prices. Often, these pharmacies will call counterfeit pills “generic” Viagra. It’s important to know that the FDA has not yet approved a generic version of Viagra. Counterfeit pills are manufactured in foreign countries where the manufacturing and quality standards are lax. The pills can be ineffective or even dangerous to your health. us only offers brand name Viagra manufactured in the United States by Pfizer, Inc.

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Side effects that you should report to your doctor or health care professional as soon as possible: female viagra They may differ from the information contained in this leaflet.PHOTOS: S&M movie scenes

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Junemann KP.How effective are PDE-5 inhibitors? Urologe A. 2003 Apr; 42(4): 553-8. Epub 2003 Mar 25.

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Brand owners Developed by the biotech firm Icos, which was acquired by Eli Lilly and Company. Manufactured by Bayer Corp. and distributed by GlaxoSmith Kline. Possible Drug Interactions With Cialis

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