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Viagra was developed and originally marketed by the pharmaceutical company Pfizer, and until 2013 Pfizer was the only company allowed to sell it. When Pfizer’s patent on Viagra expired, the market was open for other companies to produce the medicine, albeit under its generic name Sildenafil, rather than the brand name Viagra. Sildenafil contains exactly the same active ingredient as Viagra (sildenafil citrate), and works in the same way. Where can i buy propranolol online Aug 18, 2014. Viagra, Cialis and Levitra have all been shown to be effective in 60-70% of. most common erectile dysfunction treatments Viagra, Levitra or Cialis. active ingredient as Viagra sildenafil citrate, and works in the same way. can i buy viagra in cabo san lucas Tadalafil, Handelsname Cialis EU, USA, CH, Hersteller Lilly Pharma ist ein Ende 2002. Tadalafil wirkt ähnlich wie Sildenafil Viagra, Vardenafil und Avanafil, indem es das Enzym Phosphodiesterase-5 PDE-5 hemmt. PDE-5 ist. SUPER Study Group Sildenafil Citrate Therapy for Pulmonary Arterial Hypertension. Everything You Need To Know About Sildenafil VS Tadalafil. Written by Dr Kieran Seyan. Middle-aged. What's the difference between Sildenafil and Tadalafil? Cialis, Levitra, and Viagra are oral medications used to treat erectile dysfunction (ED). You may also know them by their generic names, tadalafil (Cialis), vardenafil (Levitra), and sildenafil (Viagra). About 30 million men occasionally have a problem with getting or keeping an erection, according to the Urology Care Foundation. When ED becomes a problem, many men turn to oral ED medications. Cialis, Levitra, and Viagra each work in similar ways. But there are also some differences, such as when you take them, how long they work, and what their side effects are. Cialis, Levitra, and Viagra are all in a class of drugs called PDE-5 inhibitors. These drugs work by blocking an enzyme called phosphodiesterase type 5. 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