First generation H1 blockers have anticholinergic properties and are used to treat allergies. Which of the following is one of the four main first-generation H1 blockers?

First generation H1 blockers have anticholinergic properties and are used to treat allergies. Which of the following is one of the four main first-generation H1 blockers?

• A. Chlorpheniramine
• B. Diphenhydramine
• C. Brompheniramine
• D. Promethazine

Answer: (C)

First-generation H1 blockers treat allergic symptoms by blocking histamine at H1 receptors, but they easily cross into the brain, causing sedation and often anticholinergic effects like dry mouth and blurred vision. Among the classic agents commonly listed as the four main first-generation blockers are diphenhydramine, chlorpheniramine, brompheniramine, and promethazine. Brompheniramine is one of these, so it fits as a representative example of this drug class. This class is known for sedation and anticholinergic side effects, which helps explain why these drugs can be effective for allergies but often cause drowsiness and other anticholinergic effects.

First-generation H1 blockers treat allergic symptoms by blocking histamine at H1 receptors, but they easily cross into the brain, causing sedation and often anticholinergic effects like dry mouth and blurred vision. Among the classic agents commonly listed as the four main first-generation blockers are diphenhydramine, chlorpheniramine, brompheniramine, and promethazine. Brompheniramine is one of these, so it fits as a representative example of this drug class. This class is known for sedation and anticholinergic side effects, which helps explain why these drugs can be effective for allergies but often cause drowsiness and other anticholinergic effects.