Erectile dysfunction is a condition in which a man's penis does not stiffen and enlarge when sexually stimulated or when he cannot maintain an erection. Tadalafil, a component in Tadora 20 medication, helps to increase blood flow to men's penile tissues. When a guy gets sexually aroused, his body's natural response is to increase blood flow to his penis, resulting in an erection. This medication can be used before or after meals. Take this medication with water; however, do not break or chew it.