Influenced by different geographical areas, different distributors and other factors, there is no uniform pricing for a box of Colistin, which is currently priced at around 20,000 yuan per box in the market. Colistin belongs to the macrolide antibiotics, and plays an antibacterial role by inhibiting the synthesis of bacterial proteins. The antibacterial spectrum includes Gram-positive bacteria, Mycoplasma, Chlamydia, some Gram-negative bacteria, Legionella and so on. Colistin can lead to mild digestive reactions after administration, manifested as nausea and vomiting, burning stomach, diarrhea, etc.; there are neurological reactions, manifested as abnormal dizziness, sleepiness and drowsiness, etc.; laboratory tests show abnormal indicators, such as elevation of alanine aminotransferase, and elevation of glutamic oxalate aminotransferase. Prolonged use may cause secondary infections. Note that it is forbidden for those who are allergic to this product or macrolides. Patients must use the drug under the guidance of a specialized physician and strictly comply with medical advice.