Cialis (tadalafil) and Viagra (sildenafil) are both prescription drugs used to treat erectile dysfunction (ED), but taking them together is generally not recommended. Learn about sildenafil (Viagra) usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Sildenafil: Brand-name Viagra typically sells for $50 or more per dose. Generic sildenafil can sell for as low as $12 per dose. Tadalafil: Brand-name Cialis may cost up to $70 for a 20-mg. Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). Learn about side effects, drug interactions, dosages, warnings, and more. Teva sildenafil is a generic version of Viagra used to treat erectile dysfunction (ED) and some heart conditions. Learn about Teva sildenafil and how to use it. Find patient medical information for Sildenafil (Viagra, Revatio) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Sildenafil is used to treat erectile dysfunction in adult men or pulmonary arterial hypertension in adults and children, depending on the brand or formulation. Includes sildenafil side effects, interactions, and indications. Viagra (sildenafil) is a brand-name prescription drug that’s used to treat erectile dysfunction (ED). Learn about side effects, warnings, dosage, and more. Understanding the right dosage is key to maximizing benefits while minimizing risks. This guide breaks down typical doses, timing, and adjustments to help you use sildenafil safely and effectively. Sildenafil is used to treat erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors.