Gram-negative bacteria and positive bacteria medication is different, negative bacteria can usually choose levofloxacin and so on; positive bacteria can usually choose amoxicillin and so on. 1. Gram-negative infections: light gram-negative bacilli can be treated with fluoroquinolones, such as levofloxacin and third-generation cephalosporins, such as cefoperazone and cefotaxime; heavy gram-negative bacilli can be treated with enzyme inhibitors, such as piperacillin sodium and tazobactam as well as cefoperazone sodium and sulbactam sodium. 2. Gram-positive bacterial infections: drugs need to be selected according to the corresponding type of infecting bacteria, including amoxicillin, first-generation cephalosporin, cefradine; second-generation cephalosporin, cefuroxime. Gram-positive bacteria, on the other hand, generally include streptococcus, tetanus bacillus, and staphylococcus. Common adverse reactions to levofloxacin include nausea, vomiting, diarrhea, pain, dizziness, and insomnia. Levofloxacin is contraindicated for those who are allergic to it; amoxicillin is contraindicated for those who are allergic to it, as the common side effects include nausea, vomiting, diarrhea, skin rash and anemia. In addition, the use of the above medications carries certain risks, and patients need to be guided by a specialist.