Sildenafil can only improve erectile function and does not have the effect of delay. Sildenafil is a drug used to treat erectile dysfunction, the drug is used 1 hour before coitus, when coitus under sexual stimulation can improve erectile dysfunction, so that the penis to maintain a better erection hardness and thus improve the quality of sexual life, but does not have the effect of delay. Adverse reactions to the use of this drug include headache, flushing, dyspepsia, back pain, visual abnormalities, etc. It is contraindicated for those who are allergic to this drug and should not be combined with nitrate. If there is a need for delay, it is recommended to use Dapoxetine Hydrochloride under the guidance of a physician, which can effectively prolong the latency of ejaculation and improve the duration of sexual life.