Robitussin Nighttime Cough DM contains a cough suppressant (dextromethorphan) and an antihistamine (doxylamine succinate). Benadryl (diphenhydramine) is another antihistamine. Not sure why you would want to take 2 antihistamines, as they both do the same thing. In addition, together, they can cause lowering of your breathing rate which can be dangerous.
Answered 1/7/2022
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