Male sexual dysfunction commonly includes erectile dysfunction and premature ejaculation, and medications used for treatment include sildenafil and dapoxetine. Male erectile dysfunction can be treated with oral phosphodiesterase inhibitors, such as sildenafil and tadalafil, which improve penile erection by increasing penile blood flow. It can also be treated by local injection of some vasoactive drugs such as prostaglandin E1 into the corpus cavernosum to increase erection. Men with premature ejaculation can be treated with oral medications such as sexual 5-hydroxytryptamine reuptake inhibitors such as dapoxetine to prolong ejaculation time. Local anesthetic can also be applied to the surface of the glans such as lidocaine to prolong ejaculation. When male dysfunction occurs, it is important to visit a specialized hospital for treatment. All of the above drugs need to be applied under the guidance of a doctor.