For daily dosing, the maximum dose is 5 mg per day. Tadalafil is also used to treat men who have signs and symptoms of benign prostatic hyperplasia BPH. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. How Quickly Does Cialis Work? Although not all of these side effects may occur, if they do occur they may need medical attention. Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry. When the smaller blood vessels in the lungs become more resistant to blood flow, the right ventricle must work harder to pump enough blood through the lungs. · Drug information provided by: Merative, Micromedex® US Brand Name. Adcirca; Cialis; Descriptions. Tadalafil is used to treat men who have erectile dysfunction . We have good news for you: generic Cialis, used to treat erectile dysfunction (ED)and enlarged prostates, just hit pharmacies. Prices for the generic, .  · For treatment of pulmonary arterial hypertension: Adults—40 milligrams (mg) (two 20 mg tablets) taken once a day. Take both tablets at the same time each day. Do not divide the 40 mg dose. Your doctor may adjust your dose as needed. Children—Use and dose must be determined by your doctor.