Diphenhydramine is a first-generation H1 antihistamine used to reduce the effects of histamine in allergic reactions and related conditions.
Which of the following is an antihistaminic drug?
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Question context
This question is part of 🧬 Biochemistry within the broader 🧬 Medical Science subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.