Take Silagra 100 Mg half an hour before you plan to have sex. Beginning in about 30 minutes and for up to 4 hours, it can help you get an erection if you are sexually excited. If you take this medicine after a high-fat meal (such as a cheeseburger and french fries), the medicine may take a little longer to start working. It can help you get an erection when you are sexually excited. You will not get an erection just by taking the pill.