The main function of Pirenz is to improve male sexual function and is used to treat premature ejaculation in men, and the duration of the drug is about 3 hours. It is generally recommended to be taken 1-3 hours before sexual intercourse for a better therapeutic effect, either before or after meals. The drug is absorbed and metabolized, and there is no interaction with food. It is usually recommended to take the drug once every 24 hours, and patients are not recommended to use the drug frequently. The duration of the drug’s effect is usually 3 hours, and it has a better therapeutic effect. Alcohol should be avoided while taking 必利勁. This product is not intended for use in people under 18 years of age and is prohibited for use in patients with moderate and severe liver injury. The side effects are mainly mild headache and nausea, but the side effects are temporary and will disappear soon.