Cetirizine Syrup I.P. is prescribed for treatment of various allergic infections including dermatitis, hay fever, & urticaria. It belongs to the second generation anti-histamine class of drugs that are known to work by blocking the activity of histamine H-1 receptors for exerting therapeutic effects. This syrup is well absorbed after consumption showing bioavailability of about 70% and protein binding ability of up to 96%. It exerts its action 20 to 42 minutes after consumption while showing average elimination half-life of about 8.3 hours. The activity of Cetirizine Syrup I.P. remains for as long as 24 hours before it gets eliminated in urine & feces.