Cialis is a medicine taken by mouth for the treatment dysfunction erectile IP () in men. Synonims: Cialis, Tadalafil Tablets, Tadanafil, Tadanafil SX, Sanafi, Tador Drug use Cialis is a prescription medicine taken by mouth for the treatment dysfunction erectile IP () in men. How Taken Take Cialis exactly as your doctor prescribed. Cialis comes in different doses (5 mg, 10 mg, and 20 mg). For most men, the recommended starting Cialis dose is 10 mg. Cialis ...