Class B drugs are available for clinical use and have better efficacy, but generally only partially reimbursed by medical insurance; Class C drugs are generally non-clinically necessary, more expensive and generally not reimbursable. Commonly used Class B drugs include ofloxacin tablets, ferrous succinate, nifedipine, ibuprofen, indomethacin, cephalosporin, valsartan, etc., which can be reimbursed partly according to the relevant local policies. Class C drugs are basically self-financed drugs, the reimbursement ratio is relatively small, the common clinical class C drugs mainly include health care products, anti-cancer imported drugs, high-grade products, newly developed drugs and so on, such as Gentamicin, Procaine, Vitamin B12 Granules, Transfer Factor Oral Liquid and so on. Both Class B and Class C drugs need to be used under the guidance of a doctor.