One medication used to treat erectile dysfunction is called Tadacip 20.  Additionally, it is used to treat urinary difficulties in older men that result from an enlargement of the prostate gland, a walnut-sized gland that secretes fluid to nourish and transport sperm. Only when you are sexually stimulated can this medication help you get and sustain an erection. Refrain from exceeding the suggested dosage. Tadacip 20 for erectile dysfunction should be taken at least half an hour before engaging in sexual activity.