In contrast, radioprotectors are drugs or compositions of drugs that are injected into the body before it is irradiated in order to provide a high protective effect. Radioprotectors are chemical compounds obtained synthetically or extracted from natural products. Their protective effect is manifested by a smaller lesion during the irradiation of radiosensitive tissues and their more rapid post-radiation recovery, which generally leads to a decrease in the severity of radiation injury. The use of radioprotectors after irradiation is usually ineffective