The properties are essentially the same as glycerol, but the viscosity, toxicity and irritation are smaller than glycerol. It has good solubility and can dissolve many drugs such as sulfonamides, local anesthetics, vitamin A, vitamin D, sex hormones, chloramphenicol and many volatile oils. It can be miscible with water, glycerin and ethanol, and can also be dissolved in ether and chloroform. Medium, but not compatible with fatty oils.
A certain proportion of the mixture of propylene glycol and water can delay the hydrolysis of certain drugs and increase its stability. When the concentration is selected properly, it can be used as an injection medium, and it can be used as a drug. Or a permeation enhancer for mucosal absorption.