Doctor insights on:
Allergic To Antihistamines
Can Benadryl (diphenhydramine) help a swelling and hive reaction (itching) allergic reaction to penicillin?
Depends: on the reaction, if just hives and itching, yes benadryl (diphenhydramine) can control it in the right dosage, after discontinuing the offending drug, but if more severe symptoms/swelling you need medical attention with the possible addition of epinephrine and probably steroids, ...Read more
That's curious....: Allergic reactions are when the body's immune system detect something that it recognizes as a foreign substance (ingested, contact through skin, food or medicine, or in the case of auto-immure diseases, it's own cells). One reax is to mobilize cells that secrete anti-histamines to fight the allergic reax. So, allergic relax to antihistamine would be very unusual. Let detective doc sort this out. ...Read moreSee 2 more doctor answers
Yes and no: Antihistamines, as their name implies, effectively treat itching caused by histamine released from immune cells. This includes allergies, but also other disorders that cause histamine release, like chronic hives or mastocytosis. Itching from other causes, like liver disease or disorders of the nerves, typically does not respond to antihistamines. Talk with your doctor for more info. ...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
Yes: Allergy to the entire class of antibiotics called cephalosporins is indeed possible. That allergy would be the common part of the molecule shared by all cephalosporins and penicillins, the beta-lactam ring. ...Read more
Bug / insect bites with allergic reaction. Can i take hydrocortisone and Benadryl (diphenhydramine) to cure?
Avoidance: If one is allergic to penicillin then avoidance of penicillin like medications is a requirement. Other classes of antibiotics should be fine but because an individual has one drug allergy they may be at risk for reactions to other classes of drugs. One should also be very clear that moving forward that antibiotics are needed. ...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
To treat non anaphylactic allergic reactions faster (hives and itchiness) would it be better to go with Benadryl (diphenhydramine) IM or Atarax IM?
IM of either: but the difference may be merely 30 minutes. ...Read more
Yes: Penicillin and Amoxicillin are in the same chemical family, along with all of the other antibiotics whose name ends in -cillin. People allergic to penicillin are almost certainly allergic to all members of this class, and should not be treated with any of the cillins. ...Read moreSee 1 more doctor answer
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