Hydrocodone and acetaminophen oral solution. G&W Laboratories. Accessed January 28, 2015 from http://gwlabs.com/wp-content/plugins/products/DrugInserts/HydrocodoneBitartratePI.pdf
Lortab Elixir. Akorn. Accessed January 28, 2015 from http://www.akorn.com/documents/catalog/package_inserts/0095-9090-16.pdf
Lorcet. Midlothian Labs. Accessed January 28, 2015 from http://www.midlothianlabs.com/pdf/223-01%20Product%20Insert.pdf
Norco. Actavis. Accessed January 28, 2015 from http://pi.actavis.com/data_stream.asp?product_group=1288&p=pi&language=E
Vicodin. Abbvie. Accessed January 28, 2015 from http://www.vicodin.com/hcp/prescribing-information
Xodol. Shionogi. Accessed January 28, 2015 from http://www.shionogi.com/pdf/PI/1122D00%20%2008-14%20%20Xodol%20XOD-PI-05%20AP%20eFile%20Cropped.pdf
Hydrocodone/Acetaminophen. DRUGDEX System. Truven Health Analytics. Accessed 1/29/15 from http://www.thomsonhc.com/micromedex2/