Patient: Description: First attack in January ’09, irregular attacks, wind clusters and scratches, scalp also itchy. I was seen at a dermatology hospital. I had injections, and it did not itch during the medication period, but itched when I stopped taking it. Now I am taking cetirizine, which is not very effective, how can I continue the treatment? Doctor: If the effect of cetirizine decreases, you can change to levocetirizine or loratadine and continue taking it. The treatment of chronic urticaria should not be rushed and sometimes it needs to be maintained by taking medication for a longer period of time.