GUAIFENESIN AND DEXTROMETHORPHAN HBR TABLET, EXTENDED RELEASE [PREFERRED PHARMACEUTICALS INC.] Home GUAIFENESIN AND DEXTROMETHORPHAN HBR TABLET, EXTENDED RELEASE [PREFERRED PHARMACEUTICALS INC.] GUAIFENESIN AND DEXTROMETHORPHAN HBR TABLET, EXTENDED RELEASE [PREFERRED PHARMACEUTICALS INC.] PDF | XML NDC 68788-7317-2 Set ID f35708cd-0dc6-4f10-ae6e-77116c2c2c43 Generic Name Product Class Product Number Application Number ANDA206941 Related Drugs Search DailyMed Drugs