必利勁 is the trade name and generic name of Dapoxetine, which belongs to the group of 5-hydroxytryptamine reabsorption inhibitor drugs. Such drugs also include paroxetine and sertraline. 5-hydroxytryptamine reuptake inhibitors are mainly used to treat functional premature ejaculation due to over-excitement. Ejaculation is regulated by the ejaculatory center of the cerebral cortex, and 5-hydroxytryptamine is an inhibitory neurotransmitter that controls ejaculation. Increasing its concentration can block the 5-hydroxytryptamine transporter in the central nervous system, thus delaying the urge to ejaculate in males, and is therefore effective in treating premature ejaculation. In addition to dapoxetine, 5-hydroxytryptamine reuptake inhibitor drugs include fluoxetine, paroxetine, sertraline, fluvoxamine, citalopram, and escitalopram. Among them, common adverse effects of dapoxetine include headache, dizziness and nausea. It is contraindicated for those who are allergic to this class of drugs. All of the above drugs are prescription drugs and must be taken under the guidance of a doctor, not without authorization, and it is recommended to go to the hospital if necessary.