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Doctor insights on: How Long Does A Rash From An Allergic Reaction To Amoxicillin Typically Last

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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


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I've been taking 2 amoxicillin pills everyday for 5 days and had an allergic reaction. I have a rash all over my body, how long will this last?

I've been taking 2 amoxicillin pills everyday for 5 days and had an allergic reaction. I have a rash all over my body, how long will this last?

Days: Typically drug allergic skin reactions such as hives or pinpoint rashes will begin to improve within 2 days of stopping the drug. The rash will then gradually improve over the next several days. With treatment, the course may be shortened and symptoms milder. Be sure to let your doctor know what is happening! ...Read more

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14month old has had an allergic reaction to amoxicillin. He has a rash which seems to be blistering is thus normal?

14month old has had an allergic reaction to amoxicillin. He has a rash which seems to be blistering is thus normal?

See your doctor: There's a common rash that is seen with amoxicillin that isn't actually an allergic reaction, but blisters are more worrisome especially if they are in the mouth/on mucous membranes. He should be evaluated ASAP if they are in the mouth. Take pictures so you can note any progression. Would reach out to dr who prescribed the amox and let them know so they can recommend stopping or continuing med. ...Read more

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Son had allergic reaction to amoxicillin, full body rash, stopped meds, rash cleared up 6days ago, but now it looks like its coming back what, to do?

Son had allergic reaction to amoxicillin, full body rash, stopped meds, rash cleared up 6days ago, but now it looks like its coming back what, to do?

Seek wisdom: Rashes are a large part of pediatric care. Common dilemma is that viruses often cause harmless rashes (exanthums), but drugs used to treat secondary ear infections, sinusitis, etc. Can be serious. Appearance, timing of rash is important. Recognition by a seasoned provider can be enormously reassuring. Allergists are called upon for diffucult rashes and can test for certain drug allergies. ...Read more

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Was on prednisone for a supposed allergic reaction to amoxicillin (took only 3) now on bactrim (sulfamethoxazole and trimethoprim) (4th day) and rash is coming back. Any ideas?

Was on prednisone for a supposed allergic reaction to amoxicillin (took only 3) now on bactrim (sulfamethoxazole and trimethoprim) (4th day) and rash is coming back. Any ideas?

Allergy to medicine: Amoxicillin commonly causes a rash, called a drug eruption. The drug should be stopped and never used again. If the rash is severe, than Prednisone can be given, which suppresses the allergy until it goes away by itself. If you stopped the Prednisone too soon, the rash can come back, or you may now be allergic to bactrim (sulfamethoxazole and trimethoprim), (sulfamethoxazole and trimethoprim) a sulfa drug that also causes many allergies. You should avoid bactrim (sulfamethoxazole and trimethoprim). ...Read more

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My 6month old is having serious allergic reaction to amoxicillin&clavulanate (augmentin (amoxicillin and clavulanate) prescribed by doc. Rash all over his body&face. What can I use?

My 6month old is having serious allergic reaction to amoxicillin&clavulanate (augmentin (amoxicillin and clavulanate) prescribed by doc. Rash all over his body&face. What can I use?

Call your doctor: Call the doctor who prescribed the antibiotics. Not all rashes are the same. They look different and can be caused by different things depending on if your child has had the antibiotic before and how many doses the child has taken. Rashes in a child may be due to a virus and not antibiotics. Call your doctor. ...Read more

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Bad itching and rash from amoxicillin. Is this an allergic reaction? Is there anything else that would be effective?

Bad itching and rash from amoxicillin. Is this an allergic reaction? Is there anything else that would be effective?

Maybe: If given the medication for a viral process it is not an allergic reaction. If for a bacterial it may well be. You may wish to speak to an allergist to better define what is going on. ...Read more

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Taken 2 doses of Amoxicillin; woke up from nap itchy all over and upset. No visible rash, and seems OK now (2+hr later), is this an allergic reaction?

Taken 2 doses of Amoxicillin; woke up from nap itchy all over and upset. No visible rash, and seems OK now (2+hr later), is this an allergic reaction?

Unlikely: However more history is needed: is it the first time you receive amoxicillin? are you known allergic to the drug or to penicillin? any other medicines you are on? Any new foods, garments, bed sheets, etc. For all practical purposes and safety call your doctor to ask for an alternative for now, or take the next dose at the doctor's office or the ER / urgent care waiting room, wait for an hour after ...Read more

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Missed 2 days of my liquid amoxicillin for strep. Just took a dose. Would an allergic reaction such as rash or anaphylaxis happen? I did 5 days of it.

Missed 2 days of my liquid amoxicillin for strep. Just took a dose. Would an allergic reaction such as rash or anaphylaxis happen? I did 5 days of it.

Unlikely: To have an allergic reaction or anaphylaxis. If you were allergic in this way you would most likely have the reaction almost immediately with the first dose, not after 5 days. You should try to be completely compliant with antibiotic therapy especially when treating Strep. ...Read more

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My 9 month old was prescribed amoxicillian for an ear infection. After three days, little red rashes are on his body. Is it an allergic reaction?

My 9 month old was prescribed amoxicillian for an ear infection. After three days, little red rashes are on his body. Is it an allergic reaction?

Difficult to answer: Most commonly, the rash is associated with Amoxicillin is not a true allergy, but it is difficult to say without seeing the rash. I would recommend taking your infant to his pediatrician to be sure. ...Read more

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Is it possible to have an allergic reaction to amoxicillin 5 days after finishing the last dose?

Is it possible to have an allergic reaction to amoxicillin 5 days after finishing the last dose?

Yes: This usually happens with the initial sensitization which may take about 10 days to manifest. The reaction from subsequent exposure will likely be much faster. ...Read more

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I have had 7 doses of amoxicillin in last 4 days. Today my tongue feels weird like numb/tingly. Side effect or allergic reaction? Or something else?

I have had 7 doses of amoxicillin in last 4 days. Today my tongue feels weird like numb/tingly. Side effect or allergic reaction? Or something else?

May be allergy: If this is an allergy to penicillin (amino penicillin is amoxacillin) and the tongue is involved, it could lead to angio-neurotic edema of the larynx. I would advise caution and stop the antibiotic and see an allergist to skin test you to rule out allergy to penicillin. ...Read more

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Up to how long can it be for your body to have a allergic reaction to augmentin (amoxicillin and clavulanate)?

Long enough: If it is true sensitization to the drug, natural desensitization to the drug after being truly allergic is rare, better avoid the medicine, ask your doctor for an alternative ...Read more

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My 11 month old son was diagnosed with an ear infection 2 days ago and was prescribed amoxicilin today I notice a rash on his face is this an allergic reaction?

My 11 month old son was diagnosed with an ear infection 2 days ago and was prescribed amoxicilin today I notice a rash on his face is this an allergic reaction?

Possibly: Most rashes while on antibiotics are more likely due to the body fighting off the infection than a reaction to the antibiotic. Having said this, I recommend discussing this with the prescribing physician and having the rash examined. Do not discontinue any medication without advise from his physician. Consult an allergist for possible testing if the rash is believed to be allergic in nature. ...Read more

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Baby on amoxicillan for double ear infection broke out in rash on day 7. Is this allergic reaction? Older daughter had hives on day 10. Worried.

Baby on amoxicillan for double ear infection broke out in rash on day 7. Is this allergic reaction? Older daughter had hives on day 10. Worried.

Drug allergy: Penicillin and Amoxicillin allergy are common and the most common symptom is rash including hives. The rash can start while taking the medication or even within days after stopping it. Other reasons for hive like rashes are possible including infectious rash from strep or virus. There is a skin test for penicillin allergy that an allergist can perform if necessary to sort it out. ...Read more

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Dry throat, itchy skin after 4th dose of augmentin (amoxicillin and clavulanate). No visible rash. No problems/allergies from amoxicillin in the past. Allergy?

Dry throat, itchy skin after 4th dose of augmentin (amoxicillin and clavulanate). No visible rash. No problems/allergies from amoxicillin in the past. Allergy?

Hard to say: Amoxicillin not uncommonly causes a rash but in your case it is possible that a rash will soon follow. Even though you had been able to tolerate this drug, you may become sensitized or allergic to a drug at any time. Contact your doctor re. An alternate antibiotic if your itching is not resolving or getting worse. ...Read more

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My child has swollen lips and lumps on the iniside of his lips would this be an allergic reaction to amoxicillin?

My child has swollen lips and lumps on the iniside of his lips would this be an allergic reaction to amoxicillin?

Could be: If your child has such symptoms after using amoxicillin, probably it's allergy to antibiotic.It also could be allergy to another drugs you gave to child, or it could be even insect bites. ...Read more

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What should I do about potential allergic reaction to amoxicillin?

What should I do about potential allergic reaction to amoxicillin?

What's the scenario?: Sorry to hear it! . If you are taking it and suspect an allergic reaction then of course stop and contact the prescriber. By now I'm assuming it's not progressing and not an emergency. The reaction will resolve on it's own but depending on the nature of your symptoms and severity treatment may be indicated to help you. A photo may be useful to document it and for future reference. Testing later ...Read more

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Is it possible to have an allergic reaction to amoxicillin after using it several times previously? I'm on day 4 of 875mg/2x daily and today I am breaking out in hives. What should I do?

Is it possible to have an allergic reaction to amoxicillin after using it several times previously? I'm on day 4 of 875mg/2x daily and today I am breaking out in hives. What should I do?

Medicine allergies: Yes. The thing to understand about allergic reactions is that the body generally has to have had prior exposure before an allergic response. It is actually rare to have a true allergy to something with the first exposure. You should stop the medicine and notify your physician to get a different antibiotic and document the allergy. ...Read more

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Dr sent us to pharm to get zyrtec (cetirizine) for our 7mo daughter's allergic reaction to amoxicillin. Pharm didn't like the plan. Possible negative effects?

Dr sent us to pharm to get zyrtec (cetirizine) for our 7mo daughter's allergic reaction to amoxicillin. Pharm didn't like the plan. Possible negative effects?

Trust your doctor: In general, your doctor will know what is best for you more than the pharmacist. It sounds like your doc thought your daughters reaction was quite mild and didn't require stronger medication.

Just make sure the child is getting better and not worse, particularly with respect to any difficulty breathing. ...Read more

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Could a lip blister be an allergic reaction to amoxicillin?

Could a lip blister be an allergic reaction to amoxicillin?

Probably not: If you had an allergic reaction to something it would probably be more than a single blister. Allergic reactions create all kinds of signs...Like overall bumps on your body, tongue swelling or worst of all...Anaphylactic reaction which could be deadly. If you think you are allergic to amoxicillin...Put it down on your health history for the doctor. And if you wish go to an allergist for testing. ...Read more

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How to tell if I'm having an allergic reaction to amoxicillin?

Rash or hives: Most reactions to medication cause either an immediate reaction such as hives, swelling, and low blood pressure, which is an emergency, or a delayed skin rash which can occur days later. ...Read more

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I had an allergic reaction to amoxicillin. What are my options?

Depends: That depends on what kind of infection you're treating. ...Read more

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A child who has had an allergic reaction to amoxicillin should avoid any medicine ending in cillin to be safe? Or anything that contains a cillin?

A child who has had an allergic reaction to amoxicillin should avoid any medicine ending in cillin to be safe? Or anything that contains a cillin?

Depends: Some allergic reactions like a simple rash are more cosmetic than worrisome and not as important as major hives or swelling of lips and difficulty breathing. The more intense the reaction the more important it is to avoid the trigger group. If a cillin med were the best choice in a major infection, an allergist could do some specialized work to desensitize the patient and make use safe. ...Read more

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Two year old had allergic reaction to amoxicillin. Dr replaced it with cefprozil. Instruct on cefprozil say not to take it if allergic to penicillin?

Two year old had allergic reaction to amoxicillin. Dr replaced it with cefprozil. Instruct on cefprozil say not to take it if allergic to penicillin?

Old concern: The caution on cephalosporins if penicillin allergic dates back decades to how they were produced--there often was pcn in the cephalosporins as a byproduct. Even then, risk was rare and tiny. Now even smaller, and far better to not exclude two huge antibiotic categories at young age if don't need to. Keep an eye on child as with any medication, but should not pose a problem. ...Read more

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I had a allergic reaction to amoxicillin about two weeks ago, I still have some peeling and small blisters on my hands is that normal? What do I do?

Not unusual: With severe and generalized skin involvement due to an allergic reaction, it is not unusual for complete resolution of the rash to take two weeks or more. As long as there are no new rashes appearing you need to do nothing except take an antihistamine as needed for itch relief. Make sure you inform any future health care providers of your allergy to amoxicillin. ...Read more

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I had an allergic reaction to amoxicillin 2 months ago since then having nerve pain pins and needles in my arms, legs, hands, feet. Will it go away?

I had an allergic reaction to amoxicillin 2 months ago since then having nerve pain pins and needles in my arms, legs, hands, feet. Will it go away?

Medication Reaction: It is possible the symptoms may not be related to the allergic reaction. It is recommended to make an appointment with your primary care physician to be evaluated. ...Read more

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What's a good treatment for allergic reaction from amoxicillin?

Depends on reaction: Amoxicillin is a type of penicilin
if you have allergic reaction like rash, itching, hives and unexpected swelling of face, lips, tongue. Headaches
take 50 mgm of Benadryl (diphenhydramine) and it can be repeated every 4 hours and see your doctor asap. Severe reaction may need short corse of corticosteroids
diarrhea and abdominal pain are not due to allergy. ...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

Amoxicillin (Definition)

Amoxicillin is in the penicillin class of antibiotics. All penicillins are distinguished by the presence of a beta-lactam ring, and are known to kill bacteria by inhibiting synthesis (production) ...Read more


Dr. John Chiu
1,044 Doctors shared insights

Allergic Reaction (Definition)

Sensitivities to substances, called allergens, that come into contact with the skin, nose, eyes, respiratory tract, and gastrointestinal tract. They can be inhaled into the ...Read more