Cialis Daily vs. As Needed: Which Option Is Best for You Cialis (tadalafil) is a prescription medication taken as needed - or once daily - to help with erectile dysfunction (ED) and benign prostatic hyperplasia (BPH). Tadalafil drug information; Tadalafil Tablets (Cialis) Tadalafil Tablets (Pulmonary Hypertension) Other brands. Cialis, Adcirca, Alyq, Tadliq. Professional resources. Tadalafil (Erectile...