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Are you truly allergic or did you just have a side effect? Allergy = rash, hives, difficulty breathing, sloughing skin. Side effect = diarrhea, upset stomach, orange pee, getting REALLY sick if you drank alcohol with certain antibiotics. Only 15% of patients reporting an allergy to penicillin actually have one.

Often if you had a delayed response, other antibiotics that are related can be used though you may get a reaction again but most doctors wouldn't as they don't have the time to monitor you nor would they really want to in our litigeous society.

It's important because as resistance increases it's important to use the most specific antibiotic. Also, Allergies limit choice in antibiotics to use and NO drug is without side effects. Certain penicillins & similar meds are VERY effective at killing/inhibiting bacterial growth & are often the most effective. As you limit your antibiotic range at times antibiotics with more harsh side effect profiles have to be used. Obviously if you're truly allergic & have an infection your body is not strong enough to fight it off itself you must use it to avoid become more ill. But the less drug you use the better & it's good to allow your body to fight infection in mild cases.

Also keep in mind there's a reason you get a fever with infection, it inhibits replication, including bacterial, when it's above optimal temperature. But obviously a high temp is not healthy for you cells either, but a "fiver" is not considered clinically significant until it reaches 100.9 (not in elderly, they often have lower body temps & not don't mount fevers as readily).

That Being said, most doctors would avoid all penicillin family meds (amoxicillin, ampicillin, nafcilin etc.). Also imipenem & other carbapenems, beta-lactams (have a beta-lactam ring like penicillin), and certain cephalosporins (have similar structure - R-group & beta-lactam ring) as amoxicillin & ampicillin.

They can do skin testing to asses your reactivity & if your only option is a possible allergy inducing drug in the hospital they may sensitize you to help save your life.

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Q: What antibiotic can't you take if im allergic to penicillin?
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