Tetracycline is a tetracycline antibiotic, commonly used in the form of hygromycin tablets, which are generally anti-inflammatory. Euthromycin tablets are commonly used in the treatment of rickettsial diseases, Mycoplasma spp. infections, Chlamydia spp. infections, regression fever, brucellosis, cholera, rabbit fever, bubonic plague, and soft chancre. Common adverse reactions include headache, gastrointestinal disorders, pancreatitis, esophagitis or esophageal ulcers, hepatotoxicity, nephrotoxicity, allergic reactions, anaphylaxis, asthma occurrence, photosensitization, hemolytic anemia, thrombocytopenia, neutropenia, eosinophilia, skeletal dysplasia, and vitamin B deficiency. Long-term use of the drug can lead to gastrointestinal, respiratory and urinary tract infections with drug-resistant Staphylococcus aureus, gram-negative bacilli and fungi, and in severe cases, sepsis. It is contraindicated for patients who are allergic to tetracyclines, and should not be used by pregnant and lactating women, children under 8 years of age, and with caution in the elderly. This product should be taken orally on an empty stomach to avoid the effect of food on absorption; it should be swallowed with sufficient amount of water to avoid esophageal ulcers and reduce gastrointestinal irritation. If you need to use hygromycin tablets, it is recommended to consult a medical professional, do not use the drug arbitrarily.