Doctor insights on:
Allergic To Antihistamines
Have you ever heard of anyone w/true allergy to benadryl (diphenhydramine)? Would this allergy be likely to turn serious? How can someone be allergic to antihistamines?
Yes: Good question. It is very rare but does happen. Sometimes they are not allergic to the Diphenhydramine but the dyes and fillers used to make the medicine. But people have also had reactions to dye free benadryl (diphenhydramine). You can develop an allergy to anything. I have seen people with Benadryl (diphenhydramine) allergy who could take other antihistamines such as hydroxyzine. ...Read more
Are anti nausea drugs in the same family as antihistamines? I'm allergic to anti nausea drugs, dr is now saying i'm allergic to antihistamines ?
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
I'm allergic to antihistamines. I recently broke out into hives and i don't know why. What can I buy over-the-counter as I do not have insurance?
I have been given orphenadrine for muscle spasms in the back, but i'm allergic to antihistamines , is this safe to take ? ...
My doc says cos I'm allergic to ondansetron that I'm also allergic to antihistamines, what can I use for gritty itchy eyes due to spring allergies?
Huh?: Ondansetron allergy is very uncommon. I am no allergist, but there is no apparent overlap between the antihistamine H1 and H2 receptor and the antiemetic HT3 receptor that I am aware of. In addition, antihistamines have been used as part of the treatment of ondansteron allergy. I suggest you clear this up with your doc. ...Read moreSee 1 more doctor answer
Is it possible to be allergic to all antihistamines (hives)? I see hives 90mins after taking 3 different antihit's on different days.
Is it possible for a person to be allergic to all antihistamines? (not the die but the active ingredients itself, ie cyclizine, meclozine)
Allergy: In medicine, anything is possible. However it would be unusual to be allergic to all antihistamines because there are different drug molecules with antihistaminic action that are different in molecular structure and in mechanism of action. If your question is related to a specific clinical situation see your doctor for a substitute medicine. ...Read more
If I have a true allergic reaction to Benadryl (diphenhydramine) will i be allergic to all antihistamines, like zyrtec?
No: If you are allergic to benedryl you msy not be allergic to other antihistamines. ...Read more
If allergic to 1 antihistamine, am i allergc to all? Have seen a few hives after benadryl, (diphenhydramine) xyzal, & now allegra. Coincidence or true allergy?
PROBABLY COINCIDENT: It is not possible to be allergic to all antihistamines and these are all different componds you listed.Benadryl, (diphenhydramine) xyzal and allegra.I will like to know what you call allergy, what are the symptoms and what kind of rash if any with these three antihistamine. It is possible but this kind of allergy will be considered rare consult your doctor who treated your allergies in first place;may beallergist. ...Read moreSee 2 more doctor answers
Burning itchy eyes. Not allergic but taking prescribed antihistamines and eye drops. Feels like sand in eyes but no injury occurred.
Dry eye is treated: differently from other issues such as ocular inflammation or allergies. But, they commonly can present with the same symptoms. Usually lubricating eye drops are first line therapy for dry eyes. Studies have shown that Omega-3 supplements may help as well. We can also place punctual plugs and use topical cyclosporine ophthalmic emulsion drops are some of many potential treatments. ...Read moreSee 2 more doctor answers
Is it possible to be allergic to more than one antihistamine? Not the fillers in the pills but the medicene itself. Hives from Benadryl (diphenhydramine) and xyzal?
Told of allergic rhinitis by 4 ENTs. Antihistamines + steroid spray + singulair + mucinex (guaifenesin) not working. Thick mucus PND and sore throat. Other options?
Antihistamines block: Antihistamines block the receptor sites for histamine released from mast cells or basophils in allergic reactions. As such they suppress symptoms to a variable amount. The only present treatment that can actually alter the allergic condition (diathesis) is immunotherapy (allergy injections). ...Read more
Could you tell me if someone took an antihistamine before eating a food they're allergic to, would they be ok ?
No: If their reaction to that food is an anaphylactic reaction, it is not ok. If they have an oral allergy such as with fruits, yes it is ok, see an allergist to know the difference and help you manage your food reactions better. ...Read more
depends on product: For children over 12 years old, the usual dose for Claritin and zyrtec is 10 mg a day, for xyzal (levocetirizine) and Clarinex 5 mg a day, while the dose for Allegra is 180 mg once a day or 60 mg twice a day. Pediatric doses are based on age rather than weight. There are dose adjustments for liver and kidney disease. ...Read more
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