必利勁 is the trade name for the generic name Dapoxetine Hydrochloride, and this medication treats men with premature ejaculation (PE), including enhancing ejaculation and improving sexual satisfaction. Ejaculation in humans is primarily mediated by the sympathetic nervous system, and this medication may be associated with its ability to inhibit neuronal reuptake of 5-hydroxytryptamine, which affects the potential difference between the neurotransmitter’s action on the cell’s pre and post-synaptic receptors for the treatment of premature ejaculation. Adverse reactions such as headache, dizziness, nausea, diarrhea, insomnia and fatigue may occur with the administration of this product. It is contraindicated in patients with known hypersensitivity to the product or any excipients and in patients with significant pathological conditions of the heart, in children under 18 years of age and in women. This product should be used with caution in patients with a history of mania (hypomania) or bipolar disorder, and in men with symptoms and signs of depression. The medication should be used in accordance with medical advice, and it is recommended to visit a regular hospital.