Hello Rakesh, Regarding the problem of Erectile dysfunction, it is due to decreased blood supply to the penis. Though medications like Sildenafil citrate increase blood flow to penis & maintains erection, they should always be taken under the guidance of a Doctor to avoid unwanted side effects. Performance can be improved by having a diet rich in fruits, vegetables, fish, nuts & honey. Avoid stress...practice meditation..this helps in improving concentration & builds up the confidence level. Avoid smoking & alcohol. You can also do oil massage of the penis...it increases blood flow & maintains the erection. Despite these measures, if you experience difficulty, it will be better to rule out other causes like high blood pressure, blood sugar and other local causes that impair blood flow to your genital organ. One more thing...avoid consuming any over the counter medication which claim to increase the size of penis or improve performance...it may be harmful. Wishing you a Healthy Life. Take care.