Western drugs can be metabolized in the body in 15 hours. The excretion of drugs mainly refers to the whole process of drugs from the time they are ingested into the stomach until they are excreted out of the body. There are more types of drugs, such as cold medicines, cephalosporins, hormones, and the excretion time of each drug from the body will be different. After taking the drug, it mainly passes through the kidney, bile and biliary tract, which are the main excretory channels. It takes about 15 hours from the time the drug is ingested into the stomach until it is completely metabolized from the body, of which a total of 3 half-lives need to be passed, each of which takes about 3 hours to complete. If the kidney function is not complete, the metabolism time may be slightly longer. The specific time it takes to completely metabolize the drug after taking it is mainly based on the specific analysis of your own liver and kidney function, and the metabolism time will be different for each person.