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Doctor insights on: Sulfa Drug Allergy

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Dr. Barbara Lavi
5 doctors shared insights

Drug Allergy (Definition)

A drug allergy occurs when a person is sensitive to a medicine. Signs of allergy can include itching, rashes, breathing problems and even life threatening problems like low blood pressure and anaphylaxis. Hepatitis can occur with severe drug allergies. It is imperative to stop the ...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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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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Fluconazole allergic reaction?

Fluconazole allergic reaction?

Skin usually: Adverse reactions to Fluconazole are uncommon but can manifest in various ways, but usually involve skin reactions including mucus membranes like oral ulcers. Other organ systems that can be affected include nervous, heart, muscle, eye and kidney. I just saw a young lady with second episode of severe mouth and vaginal symptoms after Diflucan (fluconazole) dose. It happens. ...Read more

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Is toradol a sulfa drug?

Toradol: Toradol is in in the family of heterocyclic Acetic Acid derivatives. It's not a sulfa drug. ...Read more

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Erythromycin allergy symptoms?

Erythromycin allergy symptoms?

The usual culprits: The causes of allergy are many but the symptoms are predictable & limited. Hives, swelling of hands, feet, eyelids & lips called angioedema, breathing issues due to windpipe swelling or asthma & GI symptoms like nausea, vomiting, abdominal pain & diarrhea. Since Erythromycin commonly causes GI symptoms it's hard to tell if this is allergy or intolerance when skin or breathing symptoms are absent. ...Read more

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Is there sulfa drug in clindamycin?

Is there sulfa drug  in clindamycin?

Different antibiotic: The sulfa antibiotics and Clindamycin are different classes of antibiotic and should not cross react in regard to drug allergies. ...Read more

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Any allergic reaction to ketalar (ketamine)?

Any allergic reaction to ketalar (ketamine)?

Agitation,: Hallucinations in some, flushing, increased heart rate are common side effects. All drugs can cause allergic reactions in rare circumstances including rash, hives, swelling of the tongue, difficulty breathing and death. ...Read more

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If i'm allergic to sulfa drugs, could i be allergic to sodium cetostearyl sulphate?

If i'm allergic to sulfa drugs, could i be allergic to sodium cetostearyl sulphate?

Sulfa allergy?: Not all sulfas cross react. Sulfa antibiotics do not cross react with most other sulfa drugs. Of course you could develop a second allergy though it is unlikely. ...Read more

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Cephalexin side effects and safety? Allergic reaction risk?

Cephalexin side effects and safety? Allergic reaction risk?

Urticaria: Cephalexin is an oral antibiotic, belongs to the class of 'cephalosporin'. People who are allergic to 'penicillin" in general, will have cross sensitivity reaction to cephalosporin as well. The drug reaction can vary from mild urticarial rash to severe anaphylaxis, which will be life a threatening situation. Sometimes cephalosporin can give 'drug induced fever' as well. Good luck ! ...Read more

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Citalopram allergy = hives?

Citalopram allergy = hives?

Very rare: According to fda data less than 1% of individuals develop urticaria (hives) or anaphylaxis with citalopram. Citalopram can be ruled out as the cause of any anaphylaxis, skin rash or hives you develop after you have been on it for over 1 year. ...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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Is pen vk 500 mg ok to take if allergic to sulfa drugs?

Yes: Pencillin is a complete different class of drug than sulfa drugs. There is no clinically relevant cross-reactivity. ...Read more

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Dr. John Chiu
2,628 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