With the 2009 edition, the American Hospital Formulary Service (AHFST) marks over 50 years of continuous publication by the American Society of Health-System Pharmacists (ASHP). Each year, an average of over 60% of AHFS content is revised to help you provide the most accurate recommendations for your patients' drug therapy. AHFS references are evidence-based and peer-reviewed, compiled without the influence of manufacturers, insurers, regulators, or other interested parties. No other drug information sources can make this claim. AHFS DI has been designated as an official compendium by the US Congress. AHFS DI contains information from medical literature and expert advice from over 500 medical scientists, physicians, pharmacists, pharmacologists, and other professionally qualified individuals that goes beyond FDA-approved labeling.