Penegra is used to treat sexual problems in men, such as impotence and erectile dysfunction. This drug contains an ingredient called Sildenafil which helps increase blood flow and stimulates men during prolonged intercourse. Take this one hour before the intercourse so that you can enjoy the intercourse with your partner. The effect of this drug lasts for 6 hours. Do not take fatty foods and cold drinks while taking this medicine as it slows down the effect of the medicine. Take this medicine as advised by your doctor.