Doctor insights on:
Allergy To Sulfamethoxazole
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
If allergic to Bactrim (sulfamethoxazole and trimethoprim) & Ceclor, is allergy to all sulfa drugs & cephalosporins assumed?
No: They are both quite different.Get a more detailed answer ›
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
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
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 moreSee 1 more doctor answer
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.
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 moreSee 1 more doctor answer
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
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 moreSee 1 more doctor answer
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
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
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 moreSee 1 more doctor answer
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
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
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
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 moreSee 1 more doctor answer
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