必利勁 is the trade name and generic name for dapoxetine hydrochloride, a 5-hydroxytryptamine reuptake inhibitor class of drugs used clinically in adult male patients with premature ejaculation and poor control of ejaculatory ability. It should not be used in women. In addition, Dapoxetine Hydrochloride should not be used in people who are allergic to the components of this drug, and it is also contraindicated in people with significant pathological conditions of the heart such as heart failure NYHA class 2 or higher, significant myocardial ischemia and valvular disease. Dapoxetine hydrochloride should not be combined with monoamine oxidase inhibitors, thioridazine and other drugs, and should not be used in patients with moderate to severe liver injury. Dapoxetine hydrochloride may cause headache, dizziness, nausea, diarrhea, insomnia, fatigue and other adverse reactions. It should be used under the supervision of a doctor and if you feel unwell, you should seek medical advice.