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What are some common side effects of antihistamines?

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Quick Answer

Drowsiness, dizziness, dry mouth, vomiting and trouble urinating are common side effects of antihistamines, according to WebMD. Nausea, confusion and blurred vision are also possible symptoms, and some children experience restlessness or moodiness. First-generation antihistamines, such as Benadryl, are more likely to trigger symptoms than newer-generation drugs, such as Allegra.

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Full Answer

Antihistamines treat allergic reactions, relieving symptoms such as congestion, sneezing, itching, hives and runny nose or eyes, MedlinePlus states. They are available in over-the-counter and prescription varieties, but individuals should avoid using antihistamines that cause extreme drowsiness if they plan to drive or operate machinery. Generally, antihistamines are considered safe for anyone over age 2, but in individual cases, doctors may restrict usage if antihistamines conflict with other medications patients are taking or threaten existing medical conditions, such as epilepsy or diabetes.

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