Tadalafil is the active ingredient in Tadalista 20. The blood arteries in your penis relax when you are sexually excited, allowing blood to flow into it and producing an erection. Only when you are sexually stimulated will Tadalista 20 help you get an erection. Tadalafil can be used to treat erectile dysfunction in adult males. When a man can't get or keep an erection strong enough for satisfying sex, this happens. It's important to take precautions like not drinking alcohol and not driving while taking medication because an overdose can have harmful side effects. It should be avoided by patients who have liver, kidney, or heart disorders. It is a prescription medication that must only be taken under a doctor's supervision.