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Doctor insights on: Cross Reacting Antibiotic Allergies

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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
2,647 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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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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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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Would allegra (fexofenadine) prevent allergic skin reactions to animal fur?

Would allegra (fexofenadine) prevent allergic skin reactions to animal fur?

Pet allergy: Allegra should tame down your reactions to pet fur, as it should also improve your nasal symptoms. ...Read more

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How long would it take for a ciproflaxin (antibiotic) allergy to take place if you had one?

How long would it take for a ciproflaxin (antibiotic) allergy to take place if you had one?

Immediately !: An allergy and a side effect are not the same. It may take several doses to cause nausea and vomiting . An allergic reaction such as face swelling and shortness of breath takes only one pill to cause your already primed immune system react violently. ...Read more

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What ingredients in neosporin can an allergic reaction?

What ingredients in neosporin can an allergic reaction?

Neosporin: Neosporin is a very common allergen, as is Bacitracin (both are very commonly used). Interestingly, neither is better than vaseline at preventing infection, but both are usually better at treating one. So, if you have a scratch, simple use of vaseline (or equivalent) is best to prevent an infection, and save the antibiotics for a proven infection. Stop using neosporin if it causes a rash for u. ...Read more

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What is the best allergy medication for seasonal allergies like pollen, dust, ragweed, hay fever, dogs, cats, hamsters etc?

What is the best allergy medication for seasonal allergies like pollen, dust, ragweed, hay fever, dogs, cats, hamsters etc?

There are a few: Not one medicine is better than another....Everyone's system is different...Some people get better with allegra..Others with zyrtec..Others with Claritin or even benadryl (diphenhydramine). These are now over-the-counter...Try some and read the labels. If you don't feel better, see a board certified allergist (www.Acaai.Org). Good luck. ...Read more

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Can environmental allergies (food, pollen, dust mites, contrast dye, penicillin) cause a high positive ANA?

Can environmental allergies (food, pollen, dust mites, contrast dye, penicillin) cause a high positive ANA?

I have seen this: While the +ANA is suggestive of SLE there can be other causes - other connective tissue disease, autoimmune thyroid disease, auto immune hepatitis to name some. I have seen a lot of people with + ANAs who only have as another problem a history of allergic reactions and I am convinced that thee allergic reactions can cause a + ANA. Everyone can have very low titters (amount) of ANA. ...Read more

Dr. Al Hegab Dr. Hegab
2 doctors agreed:
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Are allergy vaccines helpful in allergic dermatitis?

Dr. Al Hegab Dr. Hegab
2 doctors agreed:
Are allergy vaccines helpful in allergic dermatitis?

Probably: Not as strongly effective as with airways allergies, need to be prescribed and monitored by an expert, an allergist, in selected patients, after controlling the environment and trial of other modalities, and control of symptoms, good luck ...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

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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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The scabies cause allergic reaction?

The scabies cause allergic reaction?

Yes: In fact the intense itching is mostly from an allergic reaction to the mite droppings. ...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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Does latanoprost/timolol eye drops cause an allergic reaction?

Does latanoprost/timolol eye drops cause an allergic reaction?

Yes, but: Virtually any drug can cause an allergic rxn in susceptible people. Latanoprost can cause redness, blurred vision, burning and the sensation that something is "in your eye" (foreign body sensation) which you may perceive as an allergic rxn but these are actually side effects. ...Read more

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Allergic reaction to corned beef?

Allergic reaction to corned beef?

Beef allergy: Are you allergic to beef or is it simply something in the aging process of the corned beef that you reacted to? Your allergist can test you. ...Read more

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What would cause an allergic reaction on the lips? Can pollen seasonal allergies cause this?

What would cause an allergic reaction on the lips? Can pollen seasonal allergies cause this?

Allergy: Allergic reactions in the lips can be caused by pollen, but it can also be caused by foods, lip balm or other exposures you may be allergic to. If you are having frequent symptoms, then allergy testing should be considered. ...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