Yes, ED pills can cause side effects. Popular ED medications found online include: Viagra sildenafil : As the first FDA-approved PDE5 inhibitor for ED, sildenafil is taken 30 minutes to four hours before sexual intercourse to help achieve and maintain an erection. They are PDE5 inhibitors that allow for increased blood flow to the penis, leading to more frequent and harder erections. ED medications can cause side effects, and it’s crucial to have access to a medical provider if needed. Those with pre-existing conditions should always consult a healthcare provider before taking new medications or supplements. This is important for your overall health and safety, as certain medications can negatively interact with each other or cause existing conditions to worsen. That’s not to say there aren’t just as many illegitimate sites.Learn more about sildenafil oral. 1 Sildenafil is used to treat high blood pressure in the lungs (pulmonary hypertension). Learn more about Revatio.1 This is a generic drug. . As with all medications, the cost of sildenafil can vary. Factors that may affect the price you’ll pay include your treatment plan, your insurance coverage, the form your doctor . Does Viagra’s average price vary based on which strength I take (25 mg, 50 mg, mg)? Why are costs different for brand-name drugs vs. generic drugs?