The nurse informs a client they need to stop taking loratadine four days before their scheduled allergy testing. What is the indication for stopping loratadine?

A. Loratadine can interfere with the accuracy of the test: Loratadine is a second-generation antihistamine that blocks H1 receptors. Continuing the medication can suppress allergic responses, leading to false-negative results during allergy testing, which is why it must be discontinued several days beforehand. B. Loratadine can cause increased sensitivity to allergens: Loratadine does not increase sensitivity to allergens. Its mechanism involves reducing the body’s allergic response, not enhancing it, so this is not a reason to stop the medication before testing. C. Loratadine can cause hypotension during the allergy test: Loratadine does not significantly affect blood pressure. Hypotension is not a known effect of loratadine during allergy testing, so this is not a valid reason for discontinuation. D. Loratadine can cause an allergic reaction during the test: Loratadine itself is unlikely to trigger an allergic reaction. The purpose of stopping the drug is to prevent interference with test results, not to prevent a reaction caused by the medication.