Viagra generally refers to sildenafil citrate tablets, this drug is mainly used for the treatment of erectile dysfunction and is not recommended for patients with premature ejaculation. Sildenafil citrate increases blood flow to the cavernous body of the penis and improves erectile function, and is mainly used for the treatment of erectile dysfunction. The frequent adverse reactions of this product include myalgia, visual abnormalities, dizziness, nausea, skin rash, etc. It is contraindicated for those who are allergic to this product and those who are using nitrate drugs. At present, the first choice of clinical treatment of premature ejaculation is dapoxetine hydrochloride, it is recommended to first go to the hospital and under the guidance of the physician reasonable use of drugs, should not blindly use drugs, so as not to affect the therapeutic effect.