When you take Cetirizine in CETIRIZINE+AMBROXOL, it temporarily relieves allergic reactions and symptoms by blocking histamine action (a substance that causes immune responses and inflammations in the body). It helps to relieve symptoms of allergies such as sneezing, running nose, watery eyes, itching, swelling, and congestion or stiffness. Ambroxol also has a mucolytic action, which thins and loosens mucus (phlegm), making it easier to cough out.