A study by the Agency for Healthcare Research and Quality (AHRQ) found that in 2011, sedatives and hypnotics were a leading source for adverse drug events seen in the hospital setting. Approximately % of all ADEs present on admission and % of ADEs that originated during a hospital stay were caused by a sedative or hypnotic drug.  A second study by AHRQ found that in 2011, the most common specifically identified causes of adverse drug events that originated during hospital stays in the . were steroids, antibiotics, opiates/narcotics, and anticoagulants. Patients treated in urban teaching hospitals had higher rates of ADEs involving antibiotics and opiates/narcotics compared to those treated in urban nonteaching hospitals. Those treated in private, nonprofit hospitals had higher rates of most ADE causes compared to patients treated in public or private, for-profit hospitals. 
A variety of infectious agents may be transmitted by transfusion. Definitive evidence of transmission by transfusion requires demonstration of seroconversion or new infection in the recipient and isolation of an agent with genomic identity from both the recipient and the implicated donor. Strong presumptive evidence of transfusion transmission includes recipient seroconversion within an appropriate interval after transfusion, the recognition of appropriate infectious markers in an implicated donor on follow-up investigation, or both. Transfusion transmitted disease should be reported to the Australian Red Cross Blood Service.
Effective options for stress ulcer prophylaxis include PPIs, H 2 antagonists, antacids, and sucralfate (Carafate). No medication has been shown to be superior to another. Although the optimal duration of prophylaxis is not known, most experts suggest continuing therapy while the patient is in the ICU, when bleeding risk is highest. However, many patients continue to receive prophylaxis inappropriately when they are transferred to general medical units and continue therapy after discharge without clear medical indications. 31 To minimize adverse outcomes, physicians should discontinue PPIs in patients when they are discharged from the ICU if there are no other indications for therapy.