Prepared herbs without boiling can be preserved for 1-2 years, but the preservation time mainly depends on the herbs themselves and whether they are properly preserved. Generally speaking, herbs with aromatic odor and easy to volatilize can be preserved for about 1 year as long as they are properly preserved. It should be noted that it should be kept in a dry, cool and ventilated place. If the medicine is not properly preserved, and the medicine becomes moldy, damp, or deteriorated, the medicine can no longer be used. It should be noted that the potency of herbs in general will decrease with time. There are also some herbs that are kept for a relatively long time, such as gypsum, oyster, and keel bone, whose shelf life is relatively long, but generally not more than 10 years. There are also some herbs, which have better medicinal effects the longer they are kept under the premise of proper preservation, such as Chenpi, Semixia, Colla Corii Asini, and so on. If the medication has been stored for some time, it is advisable to consult a pharmacist or physician before use.