- American Society of Health-System Pharmacistswww.ashp.org
- U.S. Food and Drug Administrationwww.fda.gov
- RxListwww.rxlist.com
- PDR.netwww.pdr.net
- MedicineNetwww.medicinenet.com
- American Pharmacists Associationwww.intmedsafe.net
- International Medication Safety Networkwww.pharmacist.com
- United States Pharmacopeia (USP)www.usp.org
