Doctor insights on:
Antihistamine For Hives
Can increase dose: You can increase the dose of a non-sedating antihistamine like cetirizine to 10mg twice a day if need be. Dosing can be increased even more in some situations. You can also consider adding H2 blockers. Talk to your Allergist about additional treatment options to get better control of hives. ...Read more
Is it possible to be allergic to all antihistamines (hives)? I see hives 90mins after taking 3 different antihit's on different days.
When i take antihistamine pills for hives, i get more itchy right after taking the pills before they kick in a few hrs later. am i allergic to pills?
Be specific: You fail to indicate WHICH antihistamine. All antihistamines need time to see effect. Some are more effective than others. What type of hives, what specific trigger? Allergy to antihistamine is possible but not likely. Vague itching soon after a dose is not a good reason to suspect allergy. ...Read more
When i take oral antihistamines i get hives over my entire body. Is it possible to be allergic to antihistamines? What can be taken instead?
Unlikely: Each antihistamine is unique, so it is unlikely that you would be allergic to multiple antihistamines. I had one patient who had hives to an antihistamine, and it turned out to be an allergy to a dye. You should consult with someone familiar with these medications and medication reactions in general, such as an allergist. ...Read more
Is there a test an allergist can do that will confirm my allergy to antihistamines? I had hives after taking dye free benadryl (diphenhydramine).
See details: The one that works best for you. No single one works best for every sufferer. ...Read more
Try selective H1: Of the antihistamines, Benadryl (diphenhydramine) is the most effective, but also causes the most sedation. Some of the more selective h1 agents (eg. Claritin, Allegra or zyrtec can help). Note, zyrtec is probably a little bit more effective, but also has a sedation rate of 12%. ...Read moreSee 1 more doctor answer
Don't understand how antihistamines work for chronic hives that is due to thyroid issues and not allergies?
Chronic Urticaria CU: CU can be associated with various autoimmune disorders. Even in the absence of hypo- or hyperthyroidism, patients with thyroid autoantibodies are often poorly responsive to standard therapies and have more persistent disease. Studies have examined the use of thyroid supplementation in the treatment of CU, with mixed results. Best treatment for this condition is daily antihistamines. See Allergist. ...Read moreSee 1 more doctor answer
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