Because it is necessary to avoid risks such as errors and mistakes in the use of medicines, so as to protect the lives and health of medical staff and patients.

According to the Baidu Wenku query, the double-checking system for drugs refers to the requirement of two persons for high-risk drugs such as injections, topical and oral drugs, drugs and radioactive drugs in drug management places such as medical institutions and pharmacies. A system in which professionals check labeling, packaging, measurement, liquid measurement and other aspects, and then use or distribute them after confirming that they are correct. The double-checking system for drugs is an important measure to improve drug safety. It aims to avoid risks such as errors and mistakes in the use of drugs, thereby protecting the lives and health of medical staff and patients. It can be seen from this that the reason why two people are required to inspect the drugs entering the warehouse is to avoid risks such as errors and mistakes in the use of drugs, thereby protecting the lives and health of medical staff and patients.