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Doctor insights on: How Long Does It Take A Rash Due To A Penicillin Allergy To Clear

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How long does it take a rash due to a penicillin allergy to clear?

How long does it take a rash due to a penicillin allergy to clear?

< 7 - 10 days: Antibiotics like penicillin can cause different types of rashes that can vary in how long they persist. The classical true penicillin allergic rash is hives and once the penicillin is stopped usually resolves in less than 7-10 days. Occasionally this can trigger more prolonged hives. Other rashes from penicillin not due to true allergy would include small red bumps that usually lasts < 1-2 wks. ...Read more

Penicillin Allergy (Definition)

Penicillin allergy can be classified as an ige mediated immediate immune reaction in which a patient develops an allergic reaction to the break-down products of penicillin leading to allergy cell activation and mast cell release within 30 minutes to a few hours or it can be a delayed t cell mediated immune reaction in which patients develop a skin rash days after being ...Read more


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How long does a penicillin allergy rash take to clear?

How long does a penicillin allergy rash take to clear?

Up to 30 days: Drug allergies can resolve in a few days and may persist for several weeks until the residual penicillin by products are cleared from body. ...Read more

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How do I know when will my penicillin allergy rash go away?

How do I know when will my penicillin allergy rash go away?

A week or so: It takes about a week or so if it is indeed caused by penicillin. Amoxicillin often causes a skin rash when used for a viral infection. ...Read more

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Is there a particular type of rash associated with penicillin allergy?

Is there a particular type of rash associated with penicillin allergy?

Measles-like: Most rashes with penicillin are "morbilliform" or measles-like. More serious penicillin allergy may result in hives (itchy, patchy swellings in the skin) or angioedema (swelling of the lips, eyelids, hands or feet). There are other kinds of rashes that can occur, some of which are serious, and some of which are not. Your personal doctor or an allergist can help you decide. ...Read more

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Had reaction/rash day 5 of ceftriaxone. Told whole life I had penicillin allergy, but doc thought id be ok. Can u clarify if these 2 meds are related?

Had reaction/rash day 5 of ceftriaxone. Told whole life I had penicillin allergy, but doc thought id be ok. Can u clarify if these 2 meds are related?

Maybe related...: It is likely ceftriaxone is responsible, assuming no other obvious cause (discuss w/ your doctor). Ceftriaxone and penicillin are chemically related, but still your doctor is correct that the risk is little or no higher for ceftriaxone in people with past penicillin reactions. But with this reaction, probably best to continue to avoid both pen and ceftriaxone (and other cephalosporins) in future. ...Read more

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On augmentin875 forStrep (no result yet).Day2 no-itch rash w/tiny red bumps covers low back&stomach. No prior penicillin allergy. Is it allergy or other?

On augmentin875 forStrep (no result yet).Day2 no-itch rash w/tiny red bumps covers low back&stomach. No prior penicillin allergy. Is it allergy or other?

Mono rash?: The rash may indicate an allergic reaction to the antibiotic your are taking. You should bring this to your doctor's attention. Strep pharyngitis and infectious mononucleosis have similar presentations. Not uncommonly when mono is treated with a penicillin type medication the patient may develop a non-allergic rash which could be another explanation for the rash described in the question. ...Read more

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How long do penicillin allergy hives take to clear?

How long do penicillin allergy hives take to clear?

Varies: Hives due to drug allergy usually improve within a day or two of stopping the medicine but can last as long as a week or two. It is best to call the doctor to determine what treatment is needed. ...Read more

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Can you take cefaclor if you have a penicillin allergy?

Can you take cefaclor if you have a penicillin allergy?

See below: Depends on your pcn allergy
2-3 % cross allergy
usually ok
be careful if you have a bad reaction to pcn. ...Read more

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What antibiotics do you take if you have a penicillin allergy?

Lots of Options: Depends on the infection. Certain infections call for different antibiotics. Penicillin drugs are usually first line for most problems, however there are alternatives that can be used. Your doctor would be the best person to talk about what options are right for you. If you are interested in determining if you still have a penicillin allergy, see an Allergist for penicillin skin testing. ...Read more

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What do you take for mvp prophylaxis if you have a penicillin allergy?

What do you take for mvp prophylaxis if you have a penicillin allergy?

Depends: Some people use Cephalexin - recommendations change often, so you should see your doctor and get their suggestions. ...Read more

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What can you take if you have a penicillin allergy?

What can you take if you have a penicillin allergy?

Skin testing: 90% of pt labelled as PCN allergic are not PCN allergic. PCN skin testing and possible oral challenges can be done to clarify this reported sensitivity. ...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've heard that some people with penicillin allergy can safely take penicillin 10+ years after initial reaction. Is this true?

I've heard that some people with penicillin allergy can safely take penicillin 10+ years after initial reaction. Is this true?

No!!! Not true: If you are truly allergic you should never again take penicillin derivatives without a very good reason and physician oversight. The potential for severe life-threatening reactions remains present. Now, you must be sure that you actually had a reaction to penicillin and a good allergist or infectious diseases expert can help to determine this. Nice to hear from another Louisvillian. ...Read more

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Penicillin allergy, after 8 pills: got hives, especially fastidious on the gluteus (3 days). I started Benadryl (diphenhydramine) yesterday. How long will hives last?

Penicillin allergy, after 8 pills: got hives, especially fastidious on the gluteus (3 days). I started Benadryl (diphenhydramine) yesterday. How long will hives last?

Hard to say: Take the Benadryl (diphenhydramine) regularly as your dr. Prescribed...It could take several days to go away....But as long as there is no significant swelling (unlikely to occur now. I presume you stopped the penicillin) there should be nothing to worry about.... ...Read more

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Tested a few drops of liquid clindamycin on skin after last use (1 yr ago) I was itchy. Get itchy/redness often with ABs. Told DDS & said to try anyway. Also Penicillin allergy. Skin on arm got red after it dried on it. Can I take it or is it allergy?

Tested a few drops of liquid clindamycin on skin after last use (1 yr ago) I was itchy. Get itchy/redness often with ABs. Told DDS & said to try anyway. Also Penicillin allergy. Skin on arm got red after it dried on it. Can I take it or is it allergy?

Get tested: You may have allergy to some antibiotics. You do not want to take any medication that, for you, can produce allergic consequences. Would be best to discuss this, and be tested, with an Allergist. ...Read more

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I may need cephalosporin therapy with a suspected penicillin allergy. How does it work? Do I take a 3rd generation by mouth and sit in an ER waiting room with a buddy and an epipen (epinephrine)?

I may need cephalosporin therapy with a suspected penicillin allergy. How does it work? Do I take a 3rd generation by mouth and sit in an ER waiting room with a buddy and an epipen (epinephrine)?

Penicillin allergy: Among all patients reporting penicillin allergy, 85 to 90% will tolerate a penicillin, either because they were never allergic or because they had an earlier allergy that subsequently resolved. Among penicillin skin test-positive patients, approximately 2% will react to a cephalosporin. ...Read more

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How much is a penicillin allergy test?

Depends: You should shop around - it can vary by provider, lab and region as well as if you pay cash or use insurance - would recommend calling a company like labcorp or quest for info. ...Read more

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I have a history of penicillin allergy and just today prescribed amoxacillin. Will I die?

I have a history of penicillin allergy and just today prescribed amoxacillin. Will I die?

Medical Records: It is important to speak to your physician about your history of penicillin allergy. If it is an allergic reaction, then your medical records should contain an alert. I would also advise your pharmacist, so that they may also list the allergic reaction in your records. ...Read more

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How can you test for penicillin allergy?

How can you test for penicillin allergy?

Skin and other tests: It depends on which antibiotic is of concern. There are skin tests available for many of them, but they should be performed by a properly trained allergist with the necessary controls. After skin testing, depending on the history, another step (cautious challenge or desensitization) may be necessary. ...Read more

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Doctors, can my penicillin allergy prevent me from joining the u.s. navy?

Doctors, can my penicillin allergy prevent me from joining the u.s. navy?

I just reviewed: Enlisted / commission physical standards and did not note medication allergies as a disqualifying condition. Good luck. ...Read more

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Should fluoroquinolones be avoided for people who have penicillin allergy?

No, they're fine: There is no cross reaction between these two classes of antibiotics. ...Read more

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Can you still be treated for most infections if you have a penicillin allergy?

Can you still be treated for most infections if you have a penicillin allergy?

Yes: Despite increasing antibiotic resistance, there usually is another antibiotic that can be found. If this is not the case, and there is a serious need for penicillin, many penicillin allergies can be desensitized. This procedure takes place in the hospital and only lasts for the duration of time that you are taking penicillin, but is effective. So in emergencies, there are still options. ...Read more

Dr. John Chiu
2,638 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


Dr. John Chiu
2,673 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