wie lange vor allergietest kein cetirizin — when to see a doctor?

Cetirizine is a second-generation antihistamine. Before allergy skin testing (prick or intradermal), cetirizine should typically be stopped for 3 to 5 days, as it suppresses the skin's histamine response and can cause false-negative results. For blood tests (specific IgE), no discontinuation is needed because antihistamines do not interfere. You should see a doctor if you are unsure about stopping your medication, especially if you take it daily or rely on other antihistamines. Also seek medical advice if your allergy symptoms are severe or uncontrolled, making it risky to stop. If you have a history of severe allergic reactions (anaphylaxis), do not stop cetirizine without a doctor's guidance. The exact washout period may vary depending on the test type and individual factors – always consult your allergist. The evidence for these recommendations comes from clinical guidelines and is considered strong.