Sildenafil Citrate is mainly used for the treatment of erectile dysfunction, and its common side effects include headache and flushing, which usually disappear around 12 to 48 hours after taking the drug. Sildenafil Citrate can increase blood flow to the penis and improve erectile function in men, and is clinically used in the treatment of male erectile dysfunction. Common adverse reactions to this product include headache, nausea, flushing, dyspepsia, visual abnormalities, myalgia, dizziness, rash, etc. Most of the adverse reactions are mild and will disappear on their own, usually after 12~48 hours of administration. It is prohibited for those who are known to be allergic to the product, women, children and other groups of people, and the product can not be used in combination with nitrate drugs. It is recommended to consult a physician before using the drug, if there is obvious discomfort after taking the drug, please stop sexual activities and take proper rest.