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How long should it take an allergic reaction to amoxicillin to clear?

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DH reacted to a med he was taking and the dr said it could take up to 2 weeks for it to fully clear his system and for the hives to go away. I want to say that it took a good week for the hives to leave. I reacted to ibuprofen and it took 3-4 days for the hives to clear up. It's not instantaneous, unfortunately.

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An allergic reaction can continue for 4-6 weeks. Generally you will need to stay continually on antihistamines the first 3-5 days, after which you can expect to dose with an antihistamine as symptoms (hives, whatever) crop up. Over time the reactions will decrease in frequency.


Hmm my ped didn't say anything about giving him antihistamines, guess I'll need to call and ask. It would probably help, not only is he sick now he is probably itchy all over! Poor baby he's just miserable!

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