Cialis generic relaxes the blood vessel muscles and makes more blood move to certain body parts. Cialis is used to treat erectile dysfunction (impotence) and signs of benign prostatic hypertrophy (an enlarged prostate). Tadalafil, the drug’s main constituent, is a phosphodiesterase 5 (PDE5) inhibitor, like Cialis. Cialis treats erectile dysfunction by widening the blood arteries that supply the penis. Cialis…