Tadanxt is a combination of two medicines: Tadalafil and Dapoxetine, which treat premature ejaculation. Tadalafil is a phosphodiesterase type 5 inhibitor that works by increasing blood flow to the penis during sexual stimulation and enables its erection following sexual stimulation. Dapoxetine is a selective serotonin reuptake inhibitor that increases the level of serotonin in nerves to improve control over ejaculation and increase the time taken to ejaculate.