Every time i have had an antibiotic i have had an allergic reaction. i have a had inconclusive allergy testing. what antibiotics can i use if needed?

Not sure: Many types of adverse reaction occur with antibiotics. Worrisome reactions occur after your body produces antibody against a drug (requiring prior exposure) or severe delayed reactions that may involve rash, liver damage, joint destruction etc. Most adverse reactions are not immune-mediated. Its very abnormal to have true allergy to many antibiotics. See an allergist willing to provide answers