Antibiotic improve treatment outcome as the combined effect of both antibiotics is better than their individual effect. Methicillin-resistant Staphylococcus aureus infections may be treated with a combination therapy of fusidic acid and rifampicin. Antibiotics used in combination may also be antagonistic and the combined effects of the two antibiotics may be less than if the individual antibiotic was given as part of a monotherapy. For example, chloramphenicol and tetracyclines are antagonists to penicillins and aminoglycosides. However, this can vary depending on the species of bacteria. In general, combinations of a bacteriostatic antibiotic and bactericidal antibiotic are antagonistic. Antibiotics are commonly classified
Dental antibiotic prophylaxis complications."Standard antibiotic regimens are routinely prescribed and taken before dental procedures to avoid systemic complications secondary to the transient bacteremia caused by manipulation of the oral tissues. Although the ADA, in collaboration with AHA and AAOS have published guidelines specifying those patients who should receive antibiotic prophylaxis, research continues to further define the role dental treatment may play in causing adverse outcomes in these patients. In the past, bacteremia caused by dental procedures (in most cases due to viridans streptococci, which reside in oral cavity), such as a cleaning or extraction of a tooth was thought to be more clinically