This tends to be more affordable, but it has the same safety profile and efficacy as the branded drug — and is available in the same dosages. Children—Use is not recommended. Tadalafil Cialis. Your partner might see your inability to have an erection as a sign of diminished sexual interest. Work through relationship issues. From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health.In truth, there’s only one Viagra. That’s Pfizer’s drug powered by the active ingredient Sildenafil. It comes in 25mg, 50mg, and mg doses. Some men might find that the best treatment for erectile dysfunction (ED) is generic Sildenafil, the generic unbranded form of Viagra. This tends to be more affordable, but it has the same safety.  · Viagra; Descriptions. Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where . Oral medications are a successful erectile dysfunction treatment for many men. They include: Sildenafil (Viagra) Tadalafil (Adcirca, Cialis) Vardenafil (Levitra, Staxyn) Avanafil (Stendra) All four medications enhance the effects of nitric oxide — a natural chemical your body produces that relaxes muscles in the penis.