The oral liquid absorbs the technological characteristics of traditional Chinese medicine injection, and is prepared by further refining, concentrating, encapsulating and sterilizing the decoction. Oral liquid first appeared in the market as a form of health care products. Recently, many therapeutic oral liquids have appeared in large quantities in preparations.

Oral liquid has the advantages of small dosage, fast absorption, stable quality, convenient carrying and taking, and easy storage, and is especially suitable for industrial production. Some varieties of traditional Chinese medicine can be used for emergency medicine, so tablets, granules, pills, decoction, Chinese medicine mixture, injections and so on have appeared in recent years. It has been transformed into oral liquid, making it one of the rapidly developing dosage forms in pharmaceutical preparations. However, the production equipment and technological conditions of oral liquid are high and the cost is expensive.