Cotrimoxazole tablets belong to the antibiotics of sulfonamide class, which are easily absorbed in the gastrointestinal tract and distributed in all tissues and body fluids of the body after absorption, and can be used for systemic infections, such as urinary system infections, epidemic meningomyelitis, and respiratory system infections, as well as intestinal infections, and also for local infections of the body. It is important to pay attention to the side effects of cotrimoxazole tablets, that is, adverse reactions, such as drinking more water appropriately to avoid the formation of crystals in the urine, because cotrimoxazole tablets tend to form crystals in the urine, leading to hematuria and tubular urine. In addition, pay attention to rash, fever, and allergic reactions such as exfoliative dermatitis.