Many drugs can be better absorbed by heating them before use.

Heating refers to the process that a heat source transfers heat energy to a cooler object and makes it hot. The general external performance is the increase of temperature, which can be directly measured by thermometer and other equipment. Generally speaking, heating methods can be divided into direct heating and indirect heating. According to the acquisition of heat energy, it can be divided into direct and indirect categories. Direct heat source heating is to directly add heat energy to materials, such as flue gas heating, current heating and solar radiation heating. Indirect heat source heating is to add the heat energy of direct heat source to an intermediate heat carrier, and then the intermediate heat carrier transfers the heat energy to materials, such as steam heating, hot water heating, mineral oil heating, etc.