NyQuil and DayQuil are two types of drugs used to suppress the discomfort that is usually felt when someone is feeling cold. There are certain substances that are common to the two. For instance, both contain acetaminophen as one of their active ingredients. Acetaminophen helps to reduce fever, and also, it serves as a pain reliever.
Also, both contain Dextromethorphan HBr. Aside from these similarities, there are some differences between the two. First, NyQuil contains a particular substance that cannot be found in DayQuil. NyQuil contains an antihistamine, whereas DayQuil does not have it. On the other hand, a nasal decongestant is present in DayQuil, and not in NyQuil.
While both drugs are very effective for treating cough, fever, colds, pain, however, NyQuil will cause you to be feeling drowsy, while DayQuil is very effective in curing sneezing and running nose. However, when taking the two drugs, it is important that you use them according to the doctor's prescription.