http://global.evipnet.org/wp-content/uploads/2010/09/5_change_all-review_improving_antibiot-prescrib-hospital_cochrane2005_CD0035431.pdf

Antibiotics are used to treat infections, such as pneumonia, that are caused by bacteria. Over time however, many bacteria have becomeresistant to antibiotics. Antibiotic resistance is a serious problem for individual patients and health care systems; in hospitals, infections caused by antibiotic-resistant bacteria are associated with higher rates of death, illness and prolonged hospital stay. Bacteria often become resistant because antibiotics are used too often and incorrectly. Studies have shown that about half of the time, physicians in hospital are not prescribing antibiotics properly.Hospital physicians may be unclear about the benefits and risks of prescribing antibiotics including whether to prescribe an antibiotic, which antibiotic to prescribe, at what dose and for how long.