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250 mg PO q6hr or 500 mg PO q12hr; dosage range, 1-4 g/day in divided doses. azitromicina 500mg Respiratory Tract Infections. dextron 500mg 250 mg PO q6hr; dosage range, 1-4 g/day in divided doses Streptococcal Pharyngitis 250 mg PO q6hr or 500 mg PO q12hr; dosage range, 1-4 g/day in divided doses Cellulitis and Mastitis 500 mg PO q6hr; dosage range, 1-4 g/day in divided doses