If you’re experiencing changes or difficulties with sexual function, talk to your health care provider. Highs and lows in sexual desire may coincide with the beginning or end of a relationship, or major life changes, such as pregnancy or menopause. Both sildenafil and the metabolite have terminal half lives of about 4 hours. You are encouraged to report adverse events related to Viatris products by calling U. There is a problem with information submitted for this request. If you prefer, you may contact the U.The average length of time Viagra lasts. On average, Viagra lasts between 2 and 3 hours before its effects start to diminish. Viagra can last up to 5 hours or longer depending on your dosage, your. Viagra comes as an oral tablet in different dosages. Discuss with your doctor what’s an appropriate dose for you. For daily use, Goldstein said, the generic form, sildenafil, comes in mg tablets. Viagra (sildenafil) as low as. $ View other PDE5 Inhibitors. Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to treat .