This is important for your overall health and safety, as certain medications can negatively interact with each other or cause existing conditions to worsen. Viagra is the most widely counterfeited drug on the market. These medicines all work well for ED. Stendra avanafil : This is an as-needed medication taken 30 minutes before sex and can last up to six hours. Men who are taking nitrates or nitroglycerin Those with hypotension Men who have heart disease or heart failure ED can be the first sign of other health conditions, including cardiovascular disease and diabetes. Online telehealth services like Lemonaid offer you both safety and convenience.Cost. Pregnancy. Birth control needs. Breastfeeding. For professionals. Drug Images. What is Viagra? Viagra is a brand-name prescription drug that’s approved to treat erectile dysfunction (ED). Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to treat pulmonary arterial hypertension, a serious heart and lung condition. This drug is more popular than comparable drugs. It is available in generic and brand versions.  · Exercise sessions involving aerobic activities such as walking or cycling, undertaken for at least half an hour three times a week, were shown to improve erectile function in all men with ED. The association was found across a range of body weights, and didn’t appear to vary with health conditions or medication use of the participants.