It is used clinically for the treatment of premature ejaculation, and is generally most effective when taken 30-60 minutes before sex, and can significantly improve the patient’s ejaculatory control. The main component of 必利勁 is dapoxetine hydrochloride, its half-life is relatively short, so the duration is also relatively short, each time about 30-60 minutes before sex oral, about 10-20 minutes of delay. The main purpose of 必利勁 is to prolong male sexual intercourse by reducing the excitability of the cerebral cortex and indirectly reducing the sensitivity of the glans, so that the level of sexual excitement of the patient decreases. As a result, it may cause diarrhea, nausea, vomiting and other side effects, but most patients can tolerate it. In addition, during the medication, patients should also pay attention to relaxation and use under soothing and quiet conditions, so as not to lead to psychogenic premature ejaculation or psychogenic impotence.