Unclear question.: Once you are allergic, the reaction tends to be more intense 10 months later. Having said that , some people do lose their penicillin allergy after no contact with the drug for >5 years. However sulfa allergy will likely last forever. The response depends on drug . Many drug reactions are from intolerance which will likely persist. Your allergist will be the one to help you sort out these issues.
Answered 11/15/2014
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