Classification and usage skills of antibioticsantibacterial drugs   1.1 Classification according to the antibacterial spectrum and application of drugs   1. The main antibacterial drugs against Gram-positive bacteria include: penicillins, cephalosporins, macrolides, lincosamides, bacitracin wait.   2. The main antibacterial drugs against Gram-negative bacteria include: aminoglycosides and polymyxins.   3. Broad-spectrum antibacterial drugs include: fluoroquinolones, tetracyclines, amide alcohols, etc.   4. Antifungal and antibacterial drugs include: amphotericin B, nystatin, clotrimazole, itraconazole, fluconazole, e
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