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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
Penicillin-like antibiotics. Beta-lactam antibiotics are a broad class of antibiotics which include penicillin derivatives, cephalosporins, monobactams, carbapenems and Beta-lactamase inhibitors; basically any antibiotic agent which contains a Beta-lactam nucleus in its molecular structure. They are the most widely used group of antibiotics available.