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All allergic symptoms stem from the release of chemicals (mainly histamines) into the blood stream. The best way, besides avoidance, to stop the effects of these chemicals is with a histamine blocker or inhabiter like Diphenhydramine (Benadryl). I have dozens of allergies, and I've found that the as needed use of Benadryl can slow or even halt my symptoms. I am immune to Allegra, Claritin, Zyrtec and other types of antihistamines, so your friend will have to mark her successes and failures with different products. You should also track side effects and keep in constant communication with your doctor until a stable treatment has been found and proven effective.
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