Viagra, generally referred to as sildenafil, cannot be used to treat premature ejaculation, but is a medication to treat erectile dysfunction, and for premature ejaculation, medications such as dapoxetine can be used to treat the condition. Sildenafil is a type 5 phosphodiesterase inhibitor, which can treat erectile dysfunction, but it is important to note that adverse reactions such as facial edema and shock may occur after using the drug. In addition, patients taking nitrate are prohibited from using this drug, and it is contraindicated for women, those who are allergic to the product, children, and those whose recent cardiovascular status makes them unfit for sexual intercourse. For patients with premature ejaculation, they can be treated with Dapoxetine, which is a 5-hydroxytryptamine reuptake inhibitor, and adverse reactions such as headache and nausea may occur after using the drug. In addition, this drug should not be used in patients who are allergic to dapoxetine, and should also be contraindicated in patients with moderate to severe liver injury, and in patients with heart failure. If you need to use sildenafil or dapoxetine, please be under the supervision of a physician.