Caverta 50 mg tablets is a prescription drug used to treat erectile dysfunction (impotence) in men. Helps men get or keep an erection. Caverta 50 mg contains sildenafil which belongs to a group of medicines called phosphodiesterase type 5 (PDE 5) inhibitors. It is used to treat erectile dysfunction in men. Erectile dysfunction (also known as impotence) is a sexual condition in which a man cannot erect his hard penis, which is necessary for normal sexual activity.