Sexual activity may be a strain on your heart, especially if you have heart disease. Finding an online ED provider can feel overwhelming. Brand names Why is this medication prescribed? This boosts blood flow and helps you get an erection from sexual activity. Those who don’t feel comfortable discussing ED with an in-person provider or lack time to visit a doctor’s office may find online ED prescriptions beneficial. · Compare prescription drug prices and find coupons at more than 70, US pharmacies. Save up to 80% instantly! Sildenafil is a medication used in the management and treatment of erectile dysfunction and pulmonary arterial hypertension. It is in the phosphodiesterase-5 inhibitor (PDE5-I) class of medications. This activity describes the indications, actions, adverse effects, and contraindications of sildenafil as an agent in the clinical setting. Knowledge . Sildenafil tablets for pulmonary hypertension come in 10mg and 20mg strengths. The usual adult dose is 20mg taken 3 times a day. For erectile dysfunction, it’s best to take sildenafil on an empty stomach. It may take longer to work if .