Guaifenesin/dextromethorphan. Clinical Pharmacology. Accessed 9/29/15 from http://www.clinicalpharmacology.com.
Guaifenesin/dextromethorphan syrup. 2013 Hi-Tech Pharmacal. Accessed 9/29/15 from http://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=ed74de02-852a-4dfe-8462-fa22044a2258
Lexi-Interact. 2015 LexiComp. Accessed 9/29/2015 from http://www.lexi.com.