Cefuroxime, penicillin and other drugs are commonly used for intravenous antimicrobial therapy for 9-year-old boys with lobaric pneumonia, and the course of treatment is usually used until 5-7 days after the body temperature returns to normal or as prescribed by the doctor, with attention paid to the adverse reactions in the treatment. The drugs used for the treatment of lobar pneumonia include penicillins, first-generation and second-generation cephalosporins, so for the intravenous medication of 9-year-old boys, you can choose penicillin, cefuroxime and other drugs. These drugs are usually used to treat streptococcal pneumonia until 5 to 7 days after the body temperature returns to normal. However, in some cases of refractory or drug-resistant pneumonia, a longer period of time may be needed, and the exact course of treatment should be determined by the physician based on the condition. A drug sensitivity test is also needed to guide the change of sensitive antibiotics. If there are any adverse reactions such as rash, diarrhea, liver or kidney function abnormalities during the infusion, it is recommended to inform the physician and stop the medication. Allergic patients are forbidden to use the above drugs, cefuroxime, penicillin, etc. It is recommended to use under the guidance of clinicians, and prohibited to use on their own, and intravenous infusion should be in a professional medical institution.