The document discusses drug information systems and the role of hospital pharmacists and drug information centers. It notes that pharmacists must provide drug-related information to medical staff and patients due to the large number of new drugs. Drug information centers contain electronic records and are responsible for transmitting relevant drug information. Sources of drug information are categorized as primary, secondary, or tertiary. Primary sources contain original research while secondary sources interpret primary sources and tertiary sources collect primary and secondary information. The document outlines the process pharmacists follow to research and respond to drug information requests.