Viagra, commonly referred to as sildenafil citrate, is clinically used for the treatment of erectile dysfunction and has the ability to improve erectile function in men. Sildenafil citrate, commonly prepared as tablets, is a blue film-coated tablet that is white to off-white when the coating is removed. It is clinically used for the treatment of erectile dysfunction and has the efficacy of improving erectile function in men. Common adverse reactions to sildenafil citrate tablets mainly include headache, flushing, dizziness, nasal congestion, dyspepsia, and visual abnormalities. The drug is forbidden to be used in combination with nitrate drugs, and it is contraindicated for women, people who are allergic to the product, children, and people whose recent cardiovascular status makes them unfit for sexual intercourse. It is recommended that patients take sildenafil citrate under the guidance of a doctor to avoid the adverse consequences of blind use of the drug.