Cialis will be available by prescription only. There are many other treatments for erectile dysfunction. Combined use could lead to additional lowering of blood pressure, possibly to unsafe levels. Do not take a double dose or more than one dose per day to make up for a missed one. John’s wort. One of the first Cialis ads aired at the Super Bowl.Tadalafil (Cialis) is used to treat erectile dysfunction (ED, impotence; inability to get or keep an erection), and the symptoms of benign prostatic hyperplasia (BPH; an enlarged .  · Cialis (tadalafil) is prescribed to treat erectile dysfunction and symptoms of benign prostatic hyperplasia. It comes as a tablet that’s taken as needed or once per .  · Description and Brand Names Drug information provided by: Merative, Micromedex ® US Brand Name Adcirca Cialis Descriptions Tadalafil is used to treat .