My son had a cold/virus 4 months ago and broke out in hives. He has them everyday since. They never go away. He is currently taking Reactine 10mg 2 times a day and 120mg Allegra 1 time a day. At times they'll fade a bit but that is all. He's had autoimmune blood tests done as well as the regular blood work and Thyroid tests done, all normal. The Dr. tried him on Zantac 150mg 2 times a day but he can't tolerate it, causes extreme indigestion/heartburn. They have no idea what is causing the hives. Next step is to add Singulair 10mg a day along with the Reactine and Allegra. Any ideas?