Dapoxetine 30 mg tablets works by increasing the level of a chemical called serotonin in the brain. This increases the time taken to ejaculate and improves control over ejaculation. This helps reduce any frustration or worry that you may have due to quick ejaculation and improves your confidence. It is usually taken 1 to 3 hours before sexual activity is anticipated. Do not take this medicine more than once a day.