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    In 3D with Jsmol Viagra -- Sildenafil Citrate Sildenafil citrate, sold under the names Viagra, Revatio and under various other names, is a drug used to treat male erectile dysfunction (impotence) and pulmonary arterial hypertension (PAH), developed by the pharmaceutical company Pfizer. Its primary competitors on the market are tadalafil (Cialis), and vardenafil (Levitra). History Sildenafil (compound UK-92,480) was synthesized by a group of pharmaceutical chemists working at Pfizer's Sandwich, Kent research facility in England. It was initially studied for use in hypertension (high blood pressure) and angina pectoris (a form of ischaemic cardiovascular disease). Phase I clinical trials under the direction of Ian Osterloh suggested that the drug had little effect on angina, but that it could induce marked penile erections.[1][2] Pfizer therefore decided to market it for erectile dysfunction, rather than for angina. The drug was patented in 1996, approved for use in erectile dysfunction by the Food and Drug Administration on March 27, 1998, becoming the first pill approved to treat erectile dysfunction in the United States, and offered for sale in the United States later that year.[3] It soon became a great success: annual sales of Viagra in the period 1999–2001 exceeded $1 billion. The British press portrayed Peter Dunn and Albert Wood as the inventors of the drug, a claim which Pfizer disputes.[4] Their names are on the manufacturing patent application drug, but Pfizer claims this is only for convenience. buy doxycycline in australia VIAGRA (sildenafil citrate), an oral therapy for erectile dysfunction, is the citrate salt of sildenafil, a selective inhibitor of cyclic guanosine monophosphate (c GMP)-specific phosphodiesterase type 5 (PDE5). Sildenafil citrate is designated chemically as 1-User

    En español | In the pantheon of globally recognized brand names, Viagra is right up there with Coca-Cola and Rolls-Royce. In terms of user satisfaction, however, Viagra (sildenafil) runs a distant second to Cialis (tadalafil). I found 12 studies — none of them funded by the drug companies themselves — in which men from various countries tried both drugs and then reported which one they chose to continue. And the 8,300 participants favored Cialis by a wide margin — 3 to 1, on average. Viagra and Levitra are effective for approximately four hours, Cialis for 36. In studies that also included the third major erection drug, Levitra (vardenafil), Cialis was still substantially more popular than either competitor. In four studies where couples used Viagra, then Cialis (or vice versa), the women strongly preferred the latter. If a man takes Cialis on Friday evening, he can count on erection assistance through part of Sunday. Both men and women say they like the fact that Cialis allows them to take their eyes off that ticking clock and make love whenever they wish. So for dating couples or new lovers who prize sexual spontaneity, Cialis has a clear advantage. Oddly, Cialis is favored by a less sexually impulsive group as well: long-term spouses, who are likelier to schedule sex dates. Cialis, Viagra & Levitra ED Medications Comparison of Erectile. reviews on xenical Levitra vs Viagra - Which One is the Best Choice For ED? Viagra, Cialis and Levitra – which is best? -
     
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    ) released the Internet Drug Outlet Identification Program Progress Report for State and Federal Regulators: August 2017. The report discusses how rogue online pharmacies exploit the American perception that Canadian pharmacies provide safe medication at a lower cost. In a recent study, NABP reviewed more than 100 pharmacy websites that used “Canada” or “Canadian” in their name or URL, or posted a Canadian contact address, and found that 74% source drugs from countries outside of Canada. None of the 108 websites included in the study require a valid prescription, which can pose a serious health risk for patients. Half of the so-called “Canadian” websites source drugs from India or a combination of countries where counterfeit products are known to originate. Another 20% dispense drugs from unspecified foreign locations. Sourcing medications from countries without stringent regulation and oversight exposes patients to medications that are not approved by Food and Drug Administration or Health Canada. Canadian Pharmacy World Safe, Certified Canada Pharmacy buy propecia 1mg tablets Canadian Pharmacy - Certified Canada Pharmacy Online Buy Viagra Online from Canadian Pharmacy - Bonus pills
     
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