Sildenafil citrate works to improve erectile function in men and is not used in the treatment of premature ejaculation. Sildenafil citrate belongs to type 5 phosphodiesterase inhibitors, which can selectively relax the smooth muscle of the penile corpus cavernosum and promote the inflow of blood during erection, which can improve erectile function in men, but cannot treat premature ejaculation. The adverse reactions of this product include headache, dizziness, flushing, nausea, dyspepsia, myalgia, etc. It is prohibited for those who are allergic to this drug, and this product should not be combined with nitrate drugs. At present, the drug commonly used in clinical practice for the treatment of premature ejaculation is dapoxetine hydrochloride. It is recommended to use the drug under the guidance of the physician according to the situation, not blindly take the drug, so as not to affect the therapeutic effect.