According to Cialis. In trials investigating Cialis, the majority of participants receiving the drug experienced a significant improvement in ED and maintained an erection. But manufacturers offer coupons to make the drug affordable for the public consumer. In BPH, the medication relaxes the urinary tract and bladder muscles, allowing for more effortless urine flow. The drug is approved for use in adults. The enlarged prostate interferes with the normal flow of urine from the bladder and urinary tract, resulting in lower urinary tract symptoms, such as trouble urinating. To identify the possibility of patients having an allergic reaction to the Tadalafil, a pre-medical screening should be performed.$ (save %) local_offer_outlined. Avg retail price. $ medication_outlined. Availability. Available. See GoodRx coupons. warning. Are you looking for information on .  · The approved dosages of Cialis for ED, BPH symptoms, or both, are between mg and 20 mg a day or as needed. Dosages higher than 20 mg a day haven’t been studied, and it’s not known what.  · 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.