Hi I am arrlergic to a lot of antibiotics and the only group I know i can take is cefalexins. When i went to my GP on friday it was a new one who I hadnt seen before and when she asked me why i was on cefalex (im recovering fron pneumonia) she was aghast that i was on these. She said that they can cause C-diffacel (sp) and that could kill me. What I wanted to ask was whether anyone else had this allergy problem and if they do whay medication they take, and also whether it is related to APLS . For clarification the antibiotics I canot take are, Penicilan, eurthromicin, doxicyclin, tetracyclin, septrin and ampercilin.