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For acute dental and gum infections, examples of suitable antibiotics include (adult doses) for 5 days: amoxicillin 500mg 8-hourly orally, or, metronidazole 400mg 8-hourly orally, or, if penicillin allergic: clarithromycin 500mg 12-hourly orally
Beta-lactam antibiotics. The Beta-lactam antibiotics are a broad class of antibiotics that includes the penicillins and the cephalosporins. Ceftriaxone (Rocephin), a cephalosporin, is sometimes given intravenously to patients with Lyme disease.enicillin antibiotics are historically significant because they were the first drugs that were effective against many previously serious diseases such as tuberculosis, syphilis, and staphylococcus infections. Penicillins are still widely used today, though many types of bacteria are now resistant.