A 51-year-old member asked:
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Are allegra d and Benadryl (diphenhydramine) the same?

1 doctor answer
Dr. Douglas Berson
37 years experience in Allergy and Immunology
Antihistamine differ: They are not. Both are over the counter antihistamines. The similarity ends there. Allegra d contains Pseudoephedrine as a decongestant and fexofenadine as an antihistamine. Fexofenadine is non-drowsy. Benadryl is also an antihistamine called diphenhydramine. It is also the active ingredient in most otc sleeping pills and can be very sedating.
Answered on Feb 24, 2017
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