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Atopica and antihistamines such as Benadryl, hydroxyzine, Zyrtec, and chlorpheniramine must be stopped at least 7 days prior to allergy testing. Apoquel? and Cytopoint? are okay to continue as they will not affect test results. Certain sedatives/tranquilizers (such as trazodone and acepromazine) can also interfere.

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