Delay medications are also known as medications for premature ejaculation. Sildenafil does not achieve the effect of treating premature ejaculation in normal people. Sildenafil is a type 5 phosphodiesterase inhibitor, a drug that improves erection and plays little role in treating premature ejaculation. The main drug used to treat premature ejaculation is Dapoxetine. Therefore, sildenafil does not delay ejaculation in normal people, but it can improve the speed and hardness of erection. The common adverse reactions of sildenafil mainly include headache, flushing, dizziness, nasal congestion, indigestion, and visual abnormalities. Sildenafil is forbidden to be used in combination with nitrate drugs, and the drug is contraindicated in women, people who are allergic to the product, children, and people whose recent cardiovascular status makes them unfit for sexual intercourse. The drug is a prescription drug, the use of caution, need to be standardized under the guidance of a doctor to avoid adverse effects on the body.