Many farmers often add their own medicines in feeds that are self-provisioned or purchased, and they hope to promote the prevention and treatment of livestock. However, due to improper addition, they often do not achieve the desired results, but cause poisoning and even death. Three points should be paid attention to when adding drugs to feeds: A drug that is not targeted to drug selection should be selected according to the type of livestock, age, and growth stage. Young, old and poorly bred livestock and dams should choose drugs with low toxicity and low dosage. The drugs added in the compound feed should be selected as antibacterial and anthelmintic drugs that are easily absorbed by the gastrointestinal tract. Penicillin, which is easily destroyed by digestive juices, should not be added. Second, avoid arbitrarily mixed antibiotics, antibiotics, drugs, mostly a drug effect, choose one can. If it is necessary to use two or more drugs, there may be enhanced or additive effects that can be used simultaneously, otherwise, it cannot be used, for example, pepsin cannot be compatible with basic drugs, and antibiotic drugs should be used alternately. Third, avoid the prevention, treatment, regardless of feed added to the drug, we must find out whether it is preventive or therapeutic medication. In general, only half or even 1/4 of the medication can be used for preventive medications. Such as tetracycline, oxytetracycline, chlortetracycline, etc., in the feed per kilogram of body weight for the prevention of two, and chloramphenicol in the feed per kilogram of body weight for the treatment of 4 tablets, just add 1 can To a good preventive effect.