The drug does this by increasing blood flow to the stimulation area. Cenforce 200 increases the level of chemicals like serotonin and norepinephrine in the body. Sildenafil Citrate Tablets Chemicals like serotonin send messages to the nerves, and this is what leads to actions like ejaculation. It is the medicine that helps in solving problems like premature ejaculation. Ejaculation before, Cenforce 100 , or shortly after penetration is a disorder in which a man ejaculates before consciously doing so with minimal stimulation. Serotonin increases nerve activity, delays the ejaculatory reflex, thereby improving ejaculation control and increasing ejaculation time.