必利勁 is the trade name, and its correct drug name is dapoxetine hydrochloride, which is used clinically to treat the symptoms of premature ejaculation in men. Dapoxetine Hydrochloride is primarily used to treat premature ejaculation in men between the ages of 18 and 64. It is also effective in treating patients with psychological disorders due to premature ejaculation and poor ejaculatory control. Patients who are allergic to dapoxetine hydrochloride, pregnant women, nursing mothers, infants and young children, as well as patients suffering from severe heart disease and liver impairment are not suitable for the use of this drug. In addition, dapoxetine hydrochloride tablets are not suitable to be taken at the same time with ketoconazole, itraconazole, ritonavir and other medicines, so as to avoid adverse reactions between drugs. Such drugs are recommended to be taken by patients under the guidance of a professional doctor on medical advice, to avoid private medication, improper use may cause harm to the body.