This is used to treat erectile dysfunction (ED) in men. It is a phosphodiesterase type 5 (PDE5) inhibitor, which works by increasing blood flow to the penis, enabling men to achieve and maintain an erection during sexual stimulation.This is used to treat premature ejaculation (PE). Dapoxetine is a selective serotonin reuptake inhibitor (SSRI) that increases the levels of serotonin in the brain, which can delay ejaculation and improve control over ejaculation.