What decongestant?: Nyquil contains Dextromethorphan,Acetamnophen and Doxylamine(A first generation sedating antihistamine)and NyquilD contains Sudafed a decongestant You can take Nyquil plain without D,with 24 hour Decongestant.Make sure it is Nyquil plain and your 24 hour decongestant did not have antihistamine
Answered 3/20/2021
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