Cenforce 100 Mg is a very popular drug used to treat impotence. Sildenafil citrate is the active ingredient in this medicine. The use of this drug gradually loosens tight muscles and increases blood flow to the muscles. So that the erection can be easily achieved and prolonged during sexual activity. These pills should be taken only once a day otherwise it may cause side effects. The effect of this medicine varies from person to person. The effect of this drug lasts for 4-6 hours.