Allergic to pennicillin and now Sulfa. Also have Hashimotos Thyroiditis sp?  Should I be concerned about immune system? Otherwise totally healthy adult. Rarely prescribed antibiotics. 44 year old male who had tolerance for both drugs until 1997 pennicilin and now 2010 Bactrim.
Hi, Allergic to sulfa and penicillin is not an uncommon problem. It can have mild symptoms to severe anaphylaxis like clinical manifestations. Hashimotos thyroiditis is an autoimmune disease undoubtedly but it doesn't means that you have low immunity, so don't bother about it. The best way to cure allergy is only avoidance specially when it is due to some Chat Doctor.