Why might antihistamines be stopped before an allergy appointment?

Antihistamines are often withheld before an allergy appointment primarily to ensure accurate test results. These medications can mask the body's immune response to allergens by blocking histamine, a key chemical involved in allergic reactions. If a person were to take antihistamines prior to allergy testing, it could suppress the expected reactions that would indicate an allergy, leading to potentially misleading results. Accurate testing is crucial for the healthcare provider to determine the presence and severity of allergies, which guides effective treatment plans.

While dehydration can be a concern with some medications, minimizing costs doesn't directly pertain to the reliability of allergy testing. Enhancing allergy symptoms is not a goal during the testing process, hence stopping antihistamines is about fostering clear and precise diagnosis rather than increasing symptoms. Therefore, stopping antihistamines prior to the appointment is essential for the integrity of the test outcomes.