Can I take anti allergy medication before the physical examination?

It is generally not recommended to take anti allergy medication before a physical examination, as it may affect the accuracy of some test results. Antiallergic drugs may interfere with the values of allergen testing, blood routine tests, and other items, but if medication is necessary due to severe allergic reactions, it is necessary to inform the doctor in advance. Routine physical examination items such as blood routine and liver function may be affected by anti allergic drugs. The first generation of antihistamines such as Chlorpheniramine Maleate tablets may cause drowsiness, leading to low blood pressure measurements; Although second-generation drugs such as loratadine tablets have fewer side effects, they may still slightly affect eosinophil counts. Allergen specific IgE testing should be discontinued for at least 3 days, otherwise it may result in false negative results. Some anti allergic drugs contain pseudoephedrine, which may interfere with the determination of catecholamine metabolites in urine tests. If medication is necessary due to acute urticaria, anaphylactic shock, etc., it can be taken normally and the medical examination institution should be informed. If chronic allergy patients need to take medication for a long time, it is recommended to communicate with doctors to adjust the physical examination time or prioritize completing examination items that are not affected by medication. Special allergy tests such as skin prick test and bronchial provocation test must strictly follow medical advice to discontinue medication. Three days before the physical examination, it is advisable to avoid taking anti allergic drugs, especially those containing sedatives. If there are recent allergic symptoms, it is recommended to record medication usage for the doctor's reference. After completing key examinations such as blood tests, medication can be resumed according to medical advice. Maintaining sufficient sleep and avoiding vigorous exercise before a physical examination can help reduce the interference of non pharmacological factors on the results.