Under normal circumstances, when a man is stimulated with urge of love-making, the male reproductive organ fills up with blood. When male impotence occurs, enough blood does not flow to the male reproductive system. Forzest, with Tadalafil, relaxes the blood vessels in male reproductive system. This allows blood flow into the male reproductive organ, this helps male reproductive organ to stay stiff throughout the love-making activity. The stiffness subsides after love-making, just as it is supposed to in normal conditions. Please understand that this drug is not a hormone or aphrodisiac. It works only when a man is stimulated enough for love-making. Take Forzest about one hour before you plan to have make love. Beginning in about 30 minutes and lasts for up to 36 hours, is this medication is famous for. If you take this medication after a high-fat meal, the medicine may take a little longer to start working.