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Kane SP. Dextromethorphan; Doxylamine; Pseudoephedrine, ClinCalc DrugStats Database, Version 2021.10. ClinCalc: https://clincalc.com/DrugStats/Drugs/DextromethorphanDoxylaminePseudoephedrine. Updated September 15, 2021. Accessed May 19, 2022.