The mechanism of action of Tadalafil is the same sildenafil citrate jelly 5 mg 10 sachets as Viagra (Sildenafil) and works by blocking an enzyme called PDE 5 which helps the smooth muscles in the penis to relax, thereby increasing blood flow to the penis... Dapoxetine belongs to sildenafil citrate jelly 5 mg 30 sachets a class of medicines known as Selective Serotonin Reuptake Inhibitors (SSRI) which inhibits the uptake of serotonin in the neural cells. Sildenafil prevents the destruction of an enzyme cGMP and allows cGMP to accumulate and persist longer. The longer cGMP persists, the more prolonged the engorgement of the penis For ejaculation to happen in men, a reflex has to be passed on to the brain via the sympathetic nervous system. The inhibition of Serotonin uptake inhibits the ejaculatory expulsion sildenafil citrate softabs of reflex to the brain, thereby preventing premature ejaculation in men.