Tadalafil is its active ingredient and is available as a generic drug. Tadalafil was found to have similar benefits for lower urinary tract symptoms as the usually prescribed tamsulosin. ED occurs more frequently in older men. Cialis was also investigated in combination with finasteride, another BPH medication, in another trial. Patients should seek prompt medical attention if their erection lasts longer than four hours. · But on average, its effects start to lessen 2 to 3 hours after you take a dose. The typical dose for once-daily Cialis for ED is milligrams (mg) to 5 mg. When used as needed for ED, the usual. Tadalafil is a medicine used to treat erectile dysfunction (ED, also called impotence) and problems with urination caused by an enlarged prostate (benign prostatic hypertrophy or BPH). It is sometimes known by its generic name tadalafil, and sometimes known by its trade name, Cialis. There are also other brands of this medicine available. To access savings, use a GoodRx coupon and pay just a fraction of the retail price. Adcirca (brand) savings_outlined. GoodRx lowest price. $ (save %) We have good news for you: generic Cialis, used to treat erectile dysfunction (ED) and enlarged prostates, just hit pharmacies. Prices for the generic, View More .