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Doctor insights on: I Have Rash After I Take Penicillin Is This Allergy

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I have rash after I take penicillin ... Is this allergy ?

I have rash after I take penicillin ... Is this allergy ?

Maybe: Rashes after antibiotics are often from an allergy to the medication. But often viral infections and even strep throat can cause a rash and if antibiotics were given for strep (or an ear or sinus infection while the person has an underlying viral infection), the rash might be from either the antibiotic or the infection. There are skin tests that is very reliable for penicillin allergy. ...Read more

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Dr. John Chiu
2,637 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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Can I take cephalexin if I am highly allergic to penicillin? I have not taken penicillin since I was very young. Reaction of hives convulsions

Can I take cephalexin if I am highly allergic to penicillin? I have not taken penicillin since I was very young.  Reaction of hives convulsions

Penicillin allergy: You have what is known as an immediate hypersensitivity reaction to penicillin derivatives and should never be given one, since this is life-threatening. There is said to be cross-hypersensitivity reactions to cephalosporins in 5% of pen allergic persons, and 0.1% of these have a severe reaction. My advice would be not to take a cephalosporin antibiotic unless there was no alternative. ...Read more

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When I take Amoxicillin I have some difficulty breathing. Is this normal, a side-effect or an allergic reaction? I am taking it for Strep Throat.

When I take Amoxicillin I have some difficulty breathing. Is this normal, a side-effect or an allergic reaction? I am taking it for Strep Throat.

Med allergy: Difficulty breathing associated with taking a medication likely indicates allergy to the medication. Tightness in the throat suggests a severe reaction. In either case , the medication should be stopped. Severe symptoms require immediate medical attention. ...Read more

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I was allergic to penicillin as a baby. Now I am 34. Is it likely that if I take amoxicillin I could have a reaction?

I was allergic to penicillin as a baby. Now I am 34. Is it likely that if I take amoxicillin I could have a reaction?

Yes: Amoxicillin is a form of penicillin and does carry the risk of an allergic (immediate hypersensitivity )reaction if that is indeed what you had. Unfortunately the actual symptoms of drug reactions are typically poorly documented. The good news : Penicillin allergy tends to fade with time so there is an excellent chance that you are no longer allergic. A penicillin skin test can determine this ...Read more

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How quicky would i get a reaction to augmentin (amoxicillin and clavulanate) after taking it, not sure if i ever took penicillin before and concerned?

How quicky would i get a reaction to augmentin (amoxicillin and clavulanate)  after taking it, not sure if i ever took penicillin before and concerned?

Depends: The type of hypersensitivity reaction you get will vary. If immediate, more severe. If delayed hypersensitivity it may even occur some time after completion of the therapy. ...Read more

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I have been itching all over for 2 days. I think its an allergic reaction. Taken piriton once but after a while it reoccured. What could help?

I have been itching all over for 2 days. I think its an allergic reaction.  Taken piriton once but after a while it reoccured. What could help?

Can't tell but: You should continue taking antihistamine and see if the problem will go away after 10 or more days. If the problem persists and not controlled by antihistamine, see your doctor. ...Read more

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What can I take instead of penicillin if I have a penicillin allergy?

What can I take instead of penicillin if I have a penicillin allergy?

Depends: That depends on what's infected. The choice of antibiotics is dependent on the type of infection. ...Read more

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I have a severe allergy to shell fish. My doc just prescribed keflex, because I am allergic to penicillin, too. I took a benadryl, (diphenhydramine) ?

I have a severe allergy to shell fish.  My doc just prescribed keflex, because I am allergic to penicillin, too.   I took a benadryl, (diphenhydramine) ?

See detail: Being allergic to shellfish and being allergic to antibiotics are two different things. They are not related. However, as the other doctor indicated, patients that are allergic to penicillin should not (in general) take keflex. Your shellfish allergy needs to be taken seriously and not only should you strictly avoid shellfish, you should carry injectable Epinephrine in case you have exposure. ...Read more

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I m allergic to penicillin keflex azithromiacin my daughter has scarlet fever and i m worried about what i can take if i get it ?

I m allergic to penicillin keflex azithromiacin my daughter has scarlet fever and i m worried about what i can take if i get it ?

Don't panic: Scarlet fever is an acute febrile illness, primarily affecting children, caused by group a beta-hemolytic streptococci. Clinical manifestations include fever, sore throat, and fine sand-paper like rash caused by a toxin produced by the strep. Although penicillins are antibiotics of choice, there are other antibiotics that are effective. Your doctor will know. A throat culture is helpful. ...Read more

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I have allergy, probably to Ponstan 500. The skin rash is nearly gone after 5 days, but now I start to have really bad rashes. What should I do?

I have allergy, probably to Ponstan 500. The skin rash is nearly gone after 5 days, but now I start to have really bad rashes. What should I do?

Something else?: If the rash improved without treatment only to return a few days after (your dates were not defined), then the problem may be from something other than the drug implicated. If the rash was treated and returned after the treatment was stopped, then the rash (if due to the drug) may last for 2-3 weeks. ...Read more

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Any time I take any penicillin derived antibiotic I start having severe diarrhea and vomiting . This started only few months ago ! Is this allergy?

Any time I take any penicillin derived antibiotic I start having severe diarrhea and vomiting  . This started only few months ago ! Is this allergy?

Avoid them.: although this does not sound like a typical penicillin allergy, the symptoms still sound severe enough that I would avoid penicillin-derived antibiotics when you can. There are enough other antibiotics available that you should be able to avoid them most of the time. Good luck. ...Read more

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How long after taking Azithromycin would an allergic reaction happen? Developed a rash on elbows day after I finished the antibiotics. Related?

How long after taking Azithromycin would an allergic reaction happen? Developed a rash on elbows day after I finished the antibiotics. Related?

Unrelated: Drug rashes can appear within minutes to hours, a day is kind of a long period. If the rash is spreading or bothersome, call or see your doctor ...Read more

Dr. John Chiu
2,670 doctors shared insights

Rash (Definition)

A skin rash is a symptom in which a person has changes on part or all of his skin, such as color changes, bumps, blisters, oozing, peeling, ...Read more


Dr. Cornelia Franz
1,059 doctors shared insights

Rash (Definition)

A rash is a change to skin condition which can affect color, appearance, or texture. It may or may not ...Read more