必利勁 is the trade name for the generic name Dapoxetine Hydrochloride, with instructions for dosages ranging from 30 to 60 mg. Dapoxetine Hydrochloride is mainly used in the treatment of premature ejaculation in men. The medication is usually administered about 1-3 hours before intercourse, and patients are advised to swallow the whole tablet (30mg), do not chew it, and take it with a large glass of water. If the patient does not get good results from taking 30mg orally, another tablet (30mg) can be added, but it is not recommended to exceed 60mg.The interval between doses should be more than 24 hours. The use of dapoxetine hydrochloride can cause adverse reactions such as headache, dizziness, nausea, diarrhea, etc. The drug is contraindicated in people with a known allergy to the product, in patients with a significant pathological condition of the heart, and in patients with moderate and severe hepatic injury. The drug should also not be used in conjunction with thioridazine, strong cytochrome P450 3A4 inhibitors, and monoamine oxidase inhibitors. In order to use the drug safety, patients are recommended to use the drug regularly under the guidance of a doctor, and not to use the drug arbitrarily by themselves.