According to the World Allergy Association, penicillin, aspirin, and sulfonamides account for over 80 percent of allergic drug reactions worldwide. Approximately 1 to 3 percent of patient courses of penicillin are complicated by allergic reactions.
Penicillin is a very common antibiotic that doctors prescribe for many bacterial infections. As with all antibiotics, some people have negative reactions to penicillin, and some people are truly allergic to it. In either case, once you have had a negative or allergic reaction to penicillin, it’s safest to avoid this medication altogether.If you are allergic to penicillin, you are likely to be allergic to certain other antibiotics that are related to penicillin, such as cephalosporins.

Wearing a medical ID necklace or bracelet will decrease your risk of being given medications to which you may be or are allergic.

A medical ID bracelet or necklace can speak for you in emergencies when you may be unconscious or unable to
Prompt diagnosis is vital for drug hypersensitivity such as an allergic reaction to penicillin.
A medical alert ID can help in emergencies when timely identification and early withdrawal of a suspected drug can be vital.

It can also help avoid exposure and re-exposure to the offending penicillin medicine.