Qualified Medication Aides (QMA) Practice Exam

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Which one of these is NOT a common effect of antihistamines?

Dry mouth
Drowsiness
Increased appetite
Lessened allergic reactions

The correct answer is: Increased appetite

Antihistamines are primarily used to alleviate allergic reactions by blocking the action of histamine, a substance in the body that triggers various allergy symptoms. Common side effects associated with antihistamines include dry mouth and drowsiness. These side effects are a result of antihistamines' anticholinergic properties, which can inhibit the secretion of saliva, leading to dryness, and can also have a sedative effect, making drowsiness a frequent occurrence. Additionally, antihistamines effectively lessen allergic reactions by mitigating symptoms such as itching, sneezing, and runny nose. In contrast, increased appetite is not a well-documented or recognized effect of antihistamines. While some medications might influence appetite, antihistamines typically do not have this effect, making it clear why this choice stands out as not being a common effect.