It needs to be taken orally for 2-3 months to effectively improve the symptoms of premature ejaculation and prolong the duration of sexual life. However, the causes of premature ejaculation are not only the deficiency of kidney qi, but also the excessive sensitivity of the glans, lesions of the cavernous body of the penis or lesions of the ejaculatory center. Therefore, it is necessary to clarify the specific cause through examination before choosing medication. For example, blood test for sex hormone level, glans nerve sensitivity test, penile blood flow Doppler test, and then choose the medication after the cause is clear. For premature ejaculation caused by over-sensitivity of the glans, you can apply Dacronin ointment on the glans and continue treatment for 1 month to reduce the sensitivity of the glans, which can treat premature ejaculation. If premature ejaculation is caused by hormone deficiency, you can take oral testosterone undecanoate capsules for hormone supplementation, which can also improve the symptoms of premature ejaculation. If premature ejaculation is caused by lesions in the ejaculation center, you can take oral sertraline tablets and Bilevel tablets to treat it.