Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose. Levocetirizine is used to treat symptoms of year-round (perennial) allergies in adults and children who are at least 6 months old. It is also used to treat symptoms of seasonal allergies in adults and children who are at least 2 years old.
Intravenous Immunoglobulin (IVIG) is a plasma product used in the treatment of certain conditions related to the immune system.VIG therapy is done by administering medication directly into the bloodstream to help treat autoimmune diseases, immune deficiencies, and certain kinds of infections.
After IVIg is infused patients may see a response in 24- 48 hours. Some patients will have to wait 3-4 weeks to see an effect. In a few no effect may be seen. If 4-5 cycles of IVIg do not show any response then try a different approach like add intravenous steroids and antibiotics.