Sulfanilamide powder, or sulfonamide crystalline powder, is an antimicrobial drug whose main function is to inhibit the growth of bacteria. Sulfonamides, by affecting the synthesis of bacterial nucleoprotein, inhibit the growth and reproduction of bacteria. Sulfanilamide crystalline powder can treat infectious diseases caused by sensitive bacteria and provide antibacterial effect. Sulfonamides have a wide antibacterial spectrum, such as on Staphylococcus aureus, hemolytic streptococcus, Neisseria meningitidis and other Gram-positive and negative bacteria have antibacterial effect, but also for the treatment of enteritis, diarrhea and other diseases. The use of the drug may cause nausea, vomiting, diarrhea and other adverse reactions, but also on the liver and kidneys, can also cause tinnitus, dizziness, headache and so on, and may even appear a variety of mental symptoms. It should be noted that the drug is prohibited for use in allergic patients, patients with macrocytic anemia, infants under 3 months of age, and those with severe liver or kidney impairment. This drug is a prescription drug, must be standardized under the guidance of a doctor, not blindly use the drug on their own, so as not to delay the condition.