Sexual activity may be a strain on your heart, especially if you have heart disease. Sildenafil does not prevent pregnancy or the spread of sexually transmitted diseases such as human immunodeficiency virus HIV. Sildenafil Viagra is used to treat erectile dysfunction impotence; inability to get or keep an erection in men. Tadalafil Cialis. Vardenafil usually works for 4 to 5 hours. Tell your doctor or pharmacist if you are taking nitrates medications for chest pain such as isosorbide dinitrate Isordil , isosorbide mononitrate Monoket , and nitroglycerin Nitromist, Nitro-Dur, Nitrostat.The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. 99,3 % du total des ingrédients sont d’origine naturelle. -. 1. +. 24,00 €. Achetez du sildénafil sans frais cachés et sans ordonnance requise. Le Viagra générique est sûr de vous faire regretter de ne pas vous être tourné vers notre boutique en ligne plus tôt. Sildenafil is used to treat high blood pressure in the lungs (pulmonary hypertension). Learn more about Revatio. 1. This is a generic drug. The average cost for 30 Tablet(s), mg .