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Levothroid [package insert]. St. Louis, MO: Forest Pharmaceuticals, Inc.;2005 September.
Levoxyl [package insert]. Bristol, VA: King Pharmaceuticals, Inc.;2004 May.
Synthroid [package insert]. North Chicago, IL: Abbott Laboratories;2002 July.
Food and Drug Administration, Center for Drug Evaluation and Research. Electronic orange book: approved drug products with therapeutic equivalence evaluations. FDA Web site. Available at: http://www.fda.gov/cder/ob/. Accessed December 5, 2007.
Briggs GG, Freeman RK, Yaffe SJ. Drugs in Pregnancy and Lactation. 7th ed. Philadelphia (PA): Lippincott Williams & Wilkins;2005.
National Library of Medicine (US). Drugs and Lactation Database (LactMED). NLM Web site. Available at: http://toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?LACT. Accessed December 5, 2007.