Hi. I Spoke To A Friend Who Had Pharyngitus Like

Hi. I spoke to a friend who had pharyngitus like myself. Keflex was prescribe to her. I had pharyngitis for nearly six months nowand cant seem to shake it off. My doctor prescribe amoxillion if i spelled it right. Anyways if i ask my doctor for keflex does it have sulfur. I have an allergy to sulfur.