PENEGRA 100MG TABLET 4'S is a prescription medication designed to address erectile dysfunction (ED), also known as impotence, in men. Its primary function is to enhance blood flow to the penis, facilitating the achievement and maintenance of an erection during sexual activity. This medication belongs to the class of drugs known as phosphodiesterase type 5 (PDE 5) inhibitors, which work by relaxing the muscles and increasing blood flow to specific areas of the body.