Sildenafil (Viagra) is a tablet that's taken by mouth for erectile dysfunction (ED) in adults. It works as a phosphodiesterase-5 (PDE5) inhibitor to help people get an erection or keep an erection that lasts for sex. You only take a dosage when you need it (usually about an hour, or anywhere from 30 minutes to 4 hours, before sex). Learn about the dosage of Viagra for erectile dysfunction (ED). You can also find information on the drug’s strengths, how to take it, and more. Viagra is available in 25-milligram (mg), 50-mg, and 100-mg doses, with the typical starting dose being 50 mg taken an hour before sexual activity. The maximum recommended dosage is 100 mg per day. Sildenafil (Viagra) is an effective, often first-line treatment for erectile dysfunction (ED). But how much sildenafil is too much? As with all medications, you want to take the recommended dose, even if it doesn’t work right away. Sometimes, it seems beneficial to take more since sildenafil doesn’t give you an immediate erection. The medication requires sexual arousal (and usually at. Sildenafil citrate 100 mg starting dose in men with erectile dysfunction in an international, double-blind, placebo-controlled study: effect on the sexual experience and reducing feelings of anxiety about the next intercourse attempt. The journal of sexual medicine, 2009 Drug Sildenafil is commonly prescribed for erectile dysfunction and pulmonary arterial hypertension, with dosage varying by condition and patient needs. Typical adult doses range from 25 mg to 100 mg for erectile dysfunction, taken about an hour before sexual activity. Viagra (sildenafil) is used to treat erectile dysfunction or impotence in men. Includes Viagra side effects, interactions and indications. NHS medicines information on dosage for sildenafil, how to take it and what to do if you miss a dose or take too much. Determine whether Viagra is the right choice for your symptomsViagra is used to treat problems relating to male sexual function, particularly problems concerning the ability to achieve and maintain an erection. Learn how to take Viagra. Medscape - Pulmonary hypertension, erectile dysfunction-specific dosing for Revatio, Viagra (sildenafil), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation schedules, and cost information.