Dapoxetine present in Vriligy falls in the category of medicines called SSRI. It works to inhibit the reuptake of a neurotransmitter called serotonin in the brain. Serotonin is a chemical in the brain that causes sexual arousal, pleasure, and orgasmic activity. In short, enhancing the serotonin chemical action at the postsynaptic cleft helps to delay the semen ejaculation effectively. However, the exact mechanism of Vriligy is poorly understood. Though, several men have gained desired results by using Vriligy.