Question
Why would someone be allergic to penicillin, even without a family history?
Answer
People who are allergic to penicillin may also be allergic to cephalosporin antibiotics. Since you are allergic to these drugs, it is recommended that you use other types of antibiotics for treatment under the guidance of a doctor, such as erythromycin, gentamicin, levofloxacin, and metronidazole, among others.