Perhaps: Dayquil contains Acetaminophen (tylenol), phenylephrine (decongestant) and dextramethorphan (cough suppressant). There should be no interaction with saline nasal sprays, steroid nasal sprays, antihistamine nasal sprays. There would be no real reason to use a decongestant nasal spray as this would be redundant, but unlikely to be harmful.
Answered 5/15/2018
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