必利勁 is the trade name and generic name for Dapoxetine Hydrochloride Tablets, and common side effects include upright hypotension, headache, dizziness, nausea, diarrhea, insomnia and fatigue. Dapoxetine Hydrochloride Tablets is a treatment for premature ejaculation in men aged 18-64 years. Side effects such as upright hypotension, headache, dizziness, nausea, diarrhea, insomnia and fatigue may occur after taking it. In particular, symptoms associated with upright hypotension are more common, such as dizziness, drowsiness and discomfort, and even fainting in severe cases. Therefore, driving or working at heights, etc. is not recommended after taking the medication. In case of possible precursor symptoms of upright hypotension, such as marked dizziness, one should lie down immediately so that the head is lower than the rest of the body, or sit down and place the head between the knees until the symptoms disappear to avoid other accidents due to hypotension. The drug is contraindicated in people with known hypersensitivity to the product, in patients with significant pathological conditions of the heart, and in patients with moderate and severe liver damage. The drug should also not be used in conjunction with thioridazine, strong cytochrome P450 3A4 inhibitors, and monoamine oxidase inhibitors. For specific use of the drug, please follow the guidance of a specialist; if discomfort occurs after taking the drug, please stop the drug and go to a regular hospital in time for treatment.