Penicillin allergy is a medical condition where the immune system reacts negatively to penicillin, a common antibiotic medication. Some synonyms for penicillin allergy include allergic reaction to penicillin, penicillin hypersensitivity, and penicillin intolerance. Some individuals may also refer to a penicillin allergy as a penicillin sensitivity or penicillin anaphylaxis. It's important for individuals with a penicillin allergy to inform healthcare providers of their allergy, as it can lead to serious complications if penicillin is prescribed. Alternative antibiotics should be used in those with a penicillin allergy to avoid potential allergic reactions.