What antibiotic should you take if allergic to penicillin?

cephlosporins and erythromycins are used against the resistance of penicillin.

Erythromycin is in a group of drugs called macrolide antibiotics. Erythromycin is used to treat many different types of infections caused by bacteria. Cephalosporins are medicines that kill bacteria or prevent their growth.Anyone who is allergic to penicillin should check with a physician before taking any cephalosporin.