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Antihistamines act by
blocking the actions of histamine by competitive inhibition.NDEB released questions set 3
Diphenhydramine HCL (Benadryl), chlorpheniramine maleate (Chlor-Trimeton), loratadine (Claritin), and desloratadine (Clarinex) are antihistamines at which histamine receprot site listed below?
H1-receptor siteAntidepressants and Antihistamines
Which of the following antihistamines is most commonly used as preoperative medication?
PromethazineAnti inflammatory
The mechanism of action of H1 antihistamines is
competitive antagonismAnti inflammatory
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