Caverta 100 Tablet 4's belongs to the group of medicines called as phosphodiesterase type 5 (PDE 5) inhibitors which are primarily used to treat erectile dysfunction (impotence) in adult men. Erectile dysfunction is the inability to keep a hard and erect penis suitable for sexual activity. Caverta 100 Tablet 4's works by relaxing the blood vessels in the penis, thereby allows the blood flow into the penis when the person is sexually excited. Regular intake of the prescribed dose of Caverta 100 Tablet 4's helps in treating erectile dysfunction.