Antibiotic abuse can cause many hazards, such as toxic side effects, emergence of drug-resistant pathogens, secondary infection or cross-infection, and low immunity. Therefore, you should avoid using antibiotics on your own and apply them under the guidance of a doctor if necessary.1. Toxic side effects: such as common adverse reactions include gastrointestinal dysfunction, rash, etc. The abuse of certain antibiotics may cause hematopoietic dysfunction; 2. Infection or cross-infection: There are a large number of beneficial flora in the human intestine, which play an important role in the digestion of food and the absorption of nutrients. Abuse of antibiotics will kill or inhibit these microorganisms, resulting in dysbiosis of the human flora, which can easily cause diarrhea and other diseases. In addition, the destruction of the body’s normal flora will also cause secondary infections such as mycobacteria and drug-resistant bacteria, which can easily endanger lives after surgery; 4. Low immunity: Proper pathogenic bacterial infection facilitates the development of immune organs, thus enhancing immunity. If antibiotics are used immediately after illness, the immune system is not fully exercised and the immune capacity is not improved, resulting in a lower level all the time. Once re-infected with pathogens, especially drug-resistant pathogens, will be difficult to cure.