Your healthcare provider can help you determine the right dosage for you. The following nonprescription or herbal products may interact with sildenafil: cimetidine Tagamet HB , St. If partners are unsure why they’re encountering ED, keeping track of lifestyle changes–such as workload or exercise habits, diet–including alcohol, as well as moods, medications, and patterns that seem to occur in conjunction with ED could help a professional recognize and address potential causes. That means seven out of 10 people who take these drugs as prescribed will have more frequent or longer-lasting erections. Rarely reported side effects include: an erection that will not go away priapism.Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in adults (Liqrev, Revatio) and children 1 year of age and older (Revatio) with pulmonary arterial hypertension (PAH; high blood pressure in the vessels carrying blood to the . Sildenafil citrate is a white to off-white crystalline powder with a solubility of mg/mL in water and a molecular weight of VIAGRA is formulated as blue, film-coated rounded-diamond-shaped tablets equivalent to 25 mg, 50 mg and mg of sildenafil for oral administration. When to seek help Summary Erectile dysfunction, or ED, is a common condition that can make sexual activity difficult. It may lead to a loss of intimacy in a marriage or long-term .