A member asked:

My 3 year old was treating her eye with polymyxin b sul-trimethoprim and next day she developed hives. which ingredient of this med she is allergic to?

5 doctors weighed in across 2 answers
Dr. Tim Conrad answered

Specializes in Ophthalmology

Can't tell: She could be allergic to either or to something else entirely. It is often difficult, if not impossible, to tell what someone is allergic to.

Answered 3/12/2013

5.3k views

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Neomycin: Usually it is the neomycin that provokes allergy but sulfa can do this as well.

Answered 3/13/2013

5.2k views

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