Viagra generally refers to sildenafil citrate tablets, which are medications for the treatment of erectile dysfunction and do not work for the treatment of premature ejaculation. Sildenafil tablets are type 5 phosphodiesterase inhibitors used for the treatment of erectile dysfunction, taking the drug one hour before sex can maintain good erection hardness and erection time, and improve the quality of sex life. Common adverse effects of this drug include headache, dizziness, blurred vision, etc. The use of this drug is prohibited for people who are allergic to the ingredients of this drug or are taking nitrate drugs. Premature ejaculation can be treated through the use of sexy concentration training method; or through the use of condoms during sex, localized use of lidocaine spray or ointment on the head of the penis, the use of selective 5-HT reabsorption inhibitors, such as dapoxetine and other methods of treatment. Premature ejaculation, it is recommended to go to a regular hospital, follow the doctor’s instructions to choose the appropriate treatment, not to take drugs on their own, so as to avoid adverse consequences.