I am allergic to Penecillin and anything in the Penecillin family, I recently was prescribed this and I now have a rash on my legs
No they aren't related. Can you describe the rash, because sulfa drugs have a characteristic rash. Its possible that you are also allergic to one of them, usually someone with one allergy has more then one. I would give my dr a call and talk to him about it before you take anymore of them. Of course if you have any other symptoms, head to the ER.
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