The amoxycillin should have nothing to do with Thyoxine dose....... Amoxycillin is an antibiotic used to treat bacterial infections; thyroxine is a thyroid replacement med used to replace thyroid hormones. They should not be related, but should not be taken at the same time, either.
While Amoxycillin and Ampicillin are in the same class of medications, they have different ways of working in the body. The difference may be just enough that she can take one, but not the other. Or maybe since she's had a reaction, she wouldn't be able to take either at this point. Some people develop allergies/have reactions for no apparent reason.
The reaction should not be thyroid related, unless it would have something to do with a weakened immune system.
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