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Yes, taking Zyrtec (cetirizine) on the day of a RAST test can potentially affect the results. Antihistamines like Zyrtec can suppress allergic reactions and may lead to false-negative results by inhibiting the immune response. It's generally recommended to avoid antihistamines for a certain period before allergy testing to ensure accurate results. Always consult with your healthcare provider for specific instructions regarding medication prior to testing.

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AnswerBot

3d ago

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