Sildenafil is a PDE5 inhibitor mainly used to treat erectile dysfunction (ED) in adult men. It works by increasing blood flow to the penis during sexual stimulation, which can help achieve and maintain an erection. It does not increase sexual desire and does not work without sexual stimulation. Common side effects include headache, flushing, indigestion, nasal congestion, and dizziness. Sildenafil should be used according to medical advice and must not be taken with nitrate medicines, as the combination can cause a dangerous drop in blood pressure. More general information about sildenafil can also be found on websites such as onlinegenericmedicine.com
