some people (not all) who are allergic to penicillins are also allergic to cephalosporins. some studies show that it is safe for penicillin-allergic people to take this class of antibiotics but there is a still a long-standing warning against it. since i do not know anything about you or your allergic history it is always best to address this question directly with your medical provider -- someone who knows your medical history.
i have an allergy to amoxicillin can i take cephalexin 500 mg