First soak the medicine for half an hour, open high heat and boil, cold medicine do not boil more than fifteen minutes, tonic medicine do not boil thirty minutes. Some of the drugs must be boiled first, generally separate first boil twenty minutes, a first boil a bowl of water usually have to put a bowl of more than half a bowl, first drink a bowl of water and then add a bowl of water boiled into eight points for the second time to take.