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Doctor insights on: Allergy To Sulfamethoxazole

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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

Dr. John Chiu
2,690 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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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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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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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 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 someone with bactrim (sulfamethoxazole and trimethoprim) sulfa allergy take doxycycline?

Can someone with bactrim (sulfamethoxazole and trimethoprim) sulfa allergy take doxycycline?

Yes: There should be no interaction between sulfa or an allergy to Bactrim (sulfamethoxazole and trimethoprim) (which contains a sulfa antibiotic - sulfamethoxazole and another component, trimethoprim) and doxycycline. ...Read more

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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 Dr. Chiu
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Not allergic to cipro, (ciprofloxacin) but allergic to avelox and levaquin does this make sense?What to take for prostate? Allergic to bactrim ad well.

Dr. John Chiu Dr. Chiu
3 doctors agreed:

Unusual: Since they are all in the quinolone class , it is surprising. On the other hand, each drug has its own chemical structure and thus it is possible that you are not reacting to one of the group. In general, if I get a history of a reaction to two drugs in the same class, I will select an alternate. ...Read more

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Dr. Liawaty Ho Dr. Ho
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I had an allergic reaction to bactrim (sulfamethoxazole and trimethoprim). What can I take for hives?

Dr. Liawaty Ho Dr. Ho
1 doctor agreed:
I had an allergic reaction to bactrim (sulfamethoxazole and trimethoprim). What can  I take for hives?

Antihistamine: Stop bactrim. You may want to take Benadryl (diphenhydramine) for your hives. Other medication that you can take if Benadryl (diphenhydramine) is not enough - include- other antihistamine like ranitidine , or claritin, zyrtec, Allegra etc . If otc medication does not help or symptoms get worse- see your md or urgent care. ...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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Need expert help. Can someone allergic to penicillin or sulfa take cipro (ciprofloxacin)?

Need expert help. Can someone allergic to penicillin or sulfa take cipro (ciprofloxacin)?

I would not expect : to see cross-sensitivity between ciprofloxacin (a flouroquinolone) and either a penicillin or a sulfa drug. All 3 are chemically different. While a person could be allergic to all three, it would typically be considered three different allergies, not a single allergy related to all three medications. ...Read more

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If i'm allergic to septra (sulfamethoxazole and trimethoprim) (sulfa), can I take adderall?

If i'm allergic to septra (sulfamethoxazole and trimethoprim) (sulfa), can I take adderall?

Probably: The vast majority of sulfa drug allergic patients have problems with only sulfa antibiotics and typically not with other sulfa like medications. However, this is definitely something you should discuss with your doctor. ...Read more

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Can I take an otc antihistamine along with bactrim (sulfamethoxazole and trimethoprim) and prednisone? It is not for allergic reaction from bactrim (sulfamethoxazole and trimethoprim), just for pollen allergy

Can I take an otc antihistamine along with bactrim (sulfamethoxazole and trimethoprim) and prednisone? It is not for allergic reaction from bactrim (sulfamethoxazole and trimethoprim), just for pollen allergy

Yes: However, you may find that the prednisone (assuming you're using it for something else) helps more for the pollen allergy than antihistamine. If you are receiving treatment for chronic or worsening sinus pressure/infection, then I strongly recommend seeing an Allergist to get help in the future. Recurrent sinus infections will persist unless the allergy is addressed properly. Good luck! ...Read more

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If im not allergic to bactrim can i be allergic to cipro (ciprofloxacin)?

Not likely: Just because you have an allergy to Bactrim doesn't put you at increased risk for developing an allergy to cipro (ciprofloxacin). There are lots of options for antibiotics that don't cross-react with sulfa drugs so you should be fine. If you want to understand your drug allergy in more detail see a board certified Allergist for further workup and evaluation. ...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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Is ampicillin to take if allergic to erythromycin?

Is ampicillin to take if allergic to erythromycin?

No cross reaction: Ampicillin and other penicillin-type antibiotics have a completely different chemical structure than erythromycin. Thus, the risk for allergic reaction to Ampicillin is no different than your average person. Your doctor can tell you which antibiotic (ampicillin, cipro, (ciprofloxacin) etc.) will be most effective for a given infection (sinus infection vs skin infection, etc.). See your doctor for more info. ...Read more

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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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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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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

Dr. Daniel Saurborn
129 doctors shared insights

Sulfamethoxazole (Definition)

Sulfamethoxazole is a streptogramin which is a kind of anti-bacterial ...Read more


Dr. Cornelius O'leary jr
115 doctors shared insights

Gantanol (Definition)

Gantanol is a streptogramin which is a kind of anti-bacterial ...Read more