Qualified Medication Aides (QMA) Practice Exam

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What is the primary action of an antihistamine?

  1. Increase histamine production

  2. Combat the effects of histamine

  3. Enhance allergic reactions

  4. Reduce blood pressure

The correct answer is: Combat the effects of histamine

The primary action of an antihistamine is to combat the effects of histamine. Antihistamines work by blocking histamine receptors in the body, particularly H1 receptors, which are associated with allergic responses. When histamine is released during an allergic reaction, it binds to these receptors, leading to symptoms such as itching, swelling, and redness. By preventing histamine from binding to its receptors, antihistamines help to alleviate these symptoms, providing relief to individuals suffering from allergies, hay fever, or other similar conditions. Understanding this function highlights the role of antihistamines in managing allergic reactions rather than contributing to them, enhancing them, or impacting other unrelated physiological processes like blood pressure.

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