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Doctor insights on: Allergic Reaction To Antibiotics Amoxicillin

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I'm allergic to penicillin. Am I also allergic to penicillin derived antibiotics?

I'm allergic to penicillin.  Am I also allergic to penicillin derived antibiotics?

Maybe: Penicillin allergy is usually secondary to either the beta-lactam components or the minor determinants. If you are found to be allergic (via skin testing) to the beta-lactam component then you are at risk for sensitization to all beta-lactam medications, including cephalosporins. Fortunately in the majority of people, this is not the case. You should consult with your local allergy specialist. ...Read more

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Dr. John Chiu
2,720 doctors shared insights

Allergies (Definition)

Allergies occur when your immune system is triggered by envirionmental factors it should ignore--for example, pollen in the air, or dander on a cat or dog--and creates cells to fight against them. An allergic reaction typically causes itching, congestion, or drainage, and ...Read more


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Possible to have an allergic reaction to Ceclor and amoxicillin?

Possible to have an allergic reaction to Ceclor and amoxicillin?

Yes: Allergies to penicillins (including amoxicillin) are more common than allergies to cephalosporins (including ceclor), but you can be allergic to either or both. A small percentage of people who have penicillin allergies are also allergic to cephalosporins. ...Read more

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Allergic reaction to all cephalosporins possible?

Allergic reaction to all cephalosporins possible?

Yes: Allergy to the entire class of antibiotics called cephalosporins is indeed possible. That allergy would be the common part of the molecule shared by all cephalosporins and penicillins, the beta-lactam ring. ...Read more

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Bactrim allergy would i be allergic to cipro (ciprofloxacin)?

Bactrim allergy would i be allergic to cipro (ciprofloxacin)?

Not necessarily: They are not in the same class of antibiotics, so being allergic to Bactrim does not imply you would also be allergic to cipro (ciprofloxacin). ...Read more

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How to treat an allergic reaction to antibiotic?

How to treat an allergic reaction to antibiotic?

Varies: Stop antibiotic and take Benadryl (diphenhydramine) for a mild reaction like skin rash. With more serious symptoms like trouble breathing - go to er immediately as you may need more intensive treatment! ...Read more

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How can I avoid another allergic reaction to an antibiotic medicine if allergic to penicillin?

How can I avoid another allergic reaction to an antibiotic medicine if allergic to penicillin?

Avoidance: If one is allergic to penicillin then avoidance of penicillin like medications is a requirement. Other classes of antibiotics should be fine but because an individual has one drug allergy they may be at risk for reactions to other classes of drugs. One should also be very clear that moving forward that antibiotics are needed. ...Read more

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I'm allergic to penicillin. Am I also allergic to other antibiotics?

I'm allergic to penicillin.  Am I also allergic to other antibiotics?

Some of them: Their are different "classes", or families of antibiotics. You would be likely to have a reaction to amoxicillin, for instance. Their is some cross reactivity with cephalosporins, like keflex, in approximately 15% of people. You could be allergic to other meds as well, but would not be much more likely than the general population to have an allergy to quinolones, like cipro, (ciprofloxacin) or macrolides. ...Read more

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What is risk of reaction if allergic to pcn and taking cephalosporin antibiotic?

What is risk of reaction if allergic to pcn and taking cephalosporin antibiotic?

Cephalosporin rx: Older studies suggested that there was a 5-7% risk of having a reaction to a cephalosporin if you had a history of penicillin allergy. However, there have been recent studies indicating that the newer cephalosporins are structurally different enough that the risk of cross reaction is quite low, even eliminating the need to test for penicillin allergy prior to administering the cephalosporin. ...Read more

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Allergic to penicillin can I take keflex?

Likely, not certain: The majority of people who are told they are allergic to penicillin are not actually so (they get rashes for other reasons, e.g.). Of those that are allergic, about 70% or more will lose the allergy after about 10 years. If you are still allergic, there is about a 10% chance of cross-reaction to 1st-gen cephalosporins like keflex. An allergist can perform testing to judge your risk for a reaction. ...Read more

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Can you take penicillin if an augmentin (amoxicillin and clavulanate) allergy?

Can you take penicillin if an augmentin (amoxicillin and clavulanate) allergy?

Unlikely....: Depending on the type of Augmentin (amoxicillin and clavulanate) reaction you had that was described as an "allergy"; if it's a true "allergy", then you can't take penicillin since Augmentin (amoxicillin and clavulanate) contains amoxicillin, which is a class variant. ...Read more

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How typical is an allergic reaction to the antibiotic keflux?

How typical is an allergic reaction to the antibiotic keflux?

Atypical: This medication is safe. A small percentage of people develop allergy, which can be an immediate allergic reaction to Keflex alone, or to the family of antibiotics related to Keflex. Sometimes, particularly in cases of mononucleosis, a rash that is confused with allergy develops after antibiotics are taken. It is best to discuss any symptoms with a physician well-practiced in diagnosing allergy ...Read more

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If allergic to pcn are you allergic to ampicillin?

If allergic to pcn are you allergic to ampicillin?

Yes: If you had an allergic reaction to penicillin it is likely you will have the same reaction if you take ampicillin. ...Read more

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If allegic to pcn are you allergic to amoxicillin?

If allegic to pcn are you allergic to amoxicillin?

Yes: Penicillin and Amoxicillin are in the same chemical family, along with all of the other antibiotics whose name ends in -cillin. People allergic to penicillin are almost certainly allergic to all members of this class, and should not be treated with any of the cillins. ...Read more

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I am allergic to penicillin notatum, would I be allergic to penicillin or amoxicillin?

I am allergic to penicillin notatum, would I be allergic to penicillin or amoxicillin?

Probably not: Penicillium notatum is a mold/fungi that if allergic, can cause symptoms like runny nose, sneezing, nasal congestion, worsening of asthma symptoms, etc. Penicillin antibiotics do not contain enough of the mold, and when ingested, would be a different reaction. To be safe, you could get tested for penicillin allergy with an allergist. ...Read more

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If allergic to Bactrim (sulfamethoxazole and trimethoprim) & Ceclor, is allergy to all sulfa drugs & cephalosporins assumed?

If allergic to Bactrim (sulfamethoxazole and trimethoprim) & Ceclor, is allergy to all sulfa drugs & cephalosporins assumed?

Only if true allergy: Often, a side effect to a particular drug may by mistaken as an allergic reaction to a drug. If what you have experienced is a true allergic reaction, then you should avoid these types of drugs. ...Read more

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Can Benadryl (diphenhydramine) help a swelling and hive reaction (itching) allergic reaction to penicillin?

Can Benadryl (diphenhydramine) help a swelling and hive reaction (itching) allergic reaction to penicillin?

Depends: on the reaction, if just hives and itching, yes benadryl (diphenhydramine) can control it in the right dosage, after discontinuing the offending drug, but if more severe symptoms/swelling you need medical attention with the possible addition of epinephrine and probably steroids, ...Read more

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Can I take cefuroxime axetil if allergic to penicillin?

Can I take cefuroxime axetil if allergic to penicillin?

Maybe: You have about a 2-5% chance to also be allergic to cefuroxime. You may want to talk to your allergist about testing to penicillin first to confirm this allergy. If you do have pcn allergy, then you can: 1.Use a different antibiotic 2. Do a graded challenge/desensitization to cefuroxime. If negative to pcn on testing, <1% will have problems with cefuroxime. ...Read more

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I'm allergic to Erythromycin-anaphylaxis Clindamycin- anaphylaxis Bactrim- rash Sulfa drugs- rash can I use polymyxin b sulfate eye drops?

I'm allergic to Erythromycin-anaphylaxis 
Clindamycin- anaphylaxis
Bactrim- rash
Sulfa drugs- rash can I use polymyxin b sulfate eye drops?

Yes: Polymyxin is an effective anti-bacterial. You could use it without the allergies popping up as it has with others. However: are you sure you need this drop? It seems as if you are using an antibiotic for every eye inflammation, most of which are probably not bacterial. And in so doing you have sensitized yourself to antibiotics that you might need for an actual infection. ...Read more

Amoxicillin (Definition)

Amoxicillin is in the penicillin class of antibiotics. All penicillins are distinguished by the presence of a beta-lactam ring, and are known to kill bacteria by inhibiting synthesis (production) ...Read more


Dr. John Leander Po
1,117 doctors shared insights

Antibiotic (Definition)

An antibiotic is a medicine that slows, stops, or kills germs. The germs are usually bacteria causing an infection in a person, so the person uses antibiotics to help his body get ...Read more