Vasodilator It can treat erectile dysfunction and enlarged prostate (benign prostatic hyperplasia). It can also treat high blood pressure in the lungs (pulmonary arterial hypertension). Brands: Cialis and Adcirca Availability: Prescription needed Pregnancy: No known risks Alcohol: Avoid. Very serious interactions can occur Cialis is the brand name for tadalafil, a drug used to treat erectile dysfunction. It is similar to Viagra and Levitra. Under the brand name Adcirca, tadalafil is used for pulmonary arterial hypertension. Cialis increases blood flow to the penis, and this enables a man to achieve an erection.