One study found that a firm erection could be achieved with as little as 12 minutes of stimulation, but for some men it can take up to an hour. This boosts blood flow and helps you get an erection from sexual activity. Take Viagra about one hour before sexual activity and only once per day unless otherwise instructed by your healthcare provider. The patent on Revatio indicated for pulmonary arterial hypertension rather than erectile dysfunction expired in late These should prompt you to seek immediate medical attention, as not doing so could lead to penile tissue damage and potentially a permanent loss of potency. It was initially studied for use in hypertension high blood pressure and angina pectoris a symptom of ischaemic heart disease.2 days ago · In order to find out, they pooled data on ED from 11 different studies, looking at which forms of treatment worked—whether it was an exercise prescription or a Viagra one. Sure enough, aerobic exercise was almost as effective as prescription drug Viagra, not to mention it’s free, accessible, and the only side effects are improved health! Can you? While you sleep Benefits How it’s used Side effects Other options Takeaway Taking Viagra or similar medications daily can benefit your urinary and sexual health. Some people may. Sildenafil is a medicine used to treat erection problems (erectile dysfunction). Sildenafil is also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). If you have erection problems sildenafil works by temporarily increasing blood flow to your penis when you get sexually excited.