Yes — antihistamines suppress the skin response to allergen testing and can produce false-negative results. Short-acting antihistamines (loratadine, cetirizine, fexofenadine) should be stopped for at least 3–5 days before skin prick testing. Longer-acting antihistamines may need to be stopped for up to 7 days. Nasal steroid sprays, asthma inhalers, and montelukast do NOT need to be stopped before allergy testing. Please inform Dr. Dixit Kumar Thakur at Pulmovista about all medications you are taking when booking your appointment, so appropriate preparation instructions can be given.
