必利勁 is the trade name for the generic name Dapoxetine Hydrochloride. It is used to treat conditions such as premature ejaculation and usually needs to be used 6 times or for 4 weeks, the exact duration of the cure needs to be evaluated to decide how long to take the medicine. Dapoxetine Hydrochloride can be used to treat premature ejaculation and other diseases, the drug does not need to be taken daily, its dosage time is one to three hours before sex, if not specifically doctor’s orders, usually need to be evaluated after six times of use or use of the drug time span of four weeks. However, there are no authoritative clinical guidelines on how long it takes for complete healing. It is important to note that the drug should be taken by swallowing the entire tablet intact and overdosing is prohibited. Discontinuation of the drug is recommended in case of headache and nausea. The drug is contraindicated in people under 18 years of age, severe renal insufficiency, moderate to severe hepatic and renal insufficiency. And concomitant administration of thioridazine, ketoconazole, itraconazole, ritonavir and other drugs should be avoided. The drug needs to be used under the guidance of a clinician and unauthorized use is prohibited.