The first document guaranteed sole production and sale of the substance until , while the second gave Pfizer the exclusive use to treating erectile dysfunction with sildenafil until Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. Common ones include: Flushing of the skin. Viagra is also informally known as “vitamin V”, “the blue pill”, or “blue diamond”, as well as various other nicknames. Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. The patent on Revatio indicated for pulmonary arterial hypertension rather than erectile dysfunction expired in late Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes . SILDENAFIL (sil DEN a fil) treats erectile dysfunction (ED). It works by increasing blood flow to the penis, which helps to maintain an erection. This medicine may be used for other . Viagra is a brand-name medication that contains the active drug sildenafil. This active drug comes as a generic medication, too. Sildenafil and brand-name Viagra .
