CAVERTA is Ranbaxy's brand of "sildenafil citrate". Caverta is used to treat sexual problems, erectile dysfunction (ED), or impotence. Caverta increases blood supply to the lungs and reduces the work content of the heart. Caverta starts working in half an hour after it’s taken and last up to 4 hrs. Caverta may sometimes cause some change in heart rhythm which may lead to heartbeat irregularities. CAVERTA is used to treat erectile dysfunction (impotence) in men.CAVERTA can help achieve erection only if the person is sexually excited. CAVERTA can help many men who have ED, get and keep an erection when they become sexually stimulated.