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Doctor insights on: Allergic Reaction To Antibiotics

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What does an allergic reaction to antibiotics look like?

What does an allergic reaction to antibiotics look like?

Depends: It depends on the nature of the immune response. Allergic antibody (IgE) mediated reactions occur rapidly after ingestion and can involve hives, skin swelling, wheezing, shortness of breath, nausea/vomitting, diarrhea, dizziness, confusion, palpitations, loss of consciousness and even death. A delayed reaction can occur after days on the medicine and would have different constellation of symptom

Dr. John Chiu
2,606 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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What to do for allergic reaction to antibiotic? Finished course. Just wait.

What to do for allergic reaction to antibiotic? Finished course. Just wait.

Antihistamine: A short course of antihistamines like Benadryl (diphenhydramine) will help. It is advisable to have your doctor classify the allergic reaction and document in your medical record the type of antibiotic which caused the reaction. Please, always follow directions listed on over the counter meds and better yet double check with a pharmacist.

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How long does it take to recover from a severe allergic reaction to antibiotics?

How long does it take to recover from a severe allergic reaction to antibiotics?

Depends: On the reaction, which can range from some rash to full anaphylactic shock to other complications, first step is to stop the medicine, at times it might take weeks for the rash to go away with certain antibiotics, just keep away from direct sunlight as much as you can while you have the rash, follow up with your pcp/allergist, goodluck

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How to treat an allergic reaction to antibiotic?

How to treat an allergic reaction to antibiotic?

Varies: Stop antibiotic and take Benadryl (diphenhydramine) for a mild reaction like skin rash. With more serious symptoms like trouble breathing - go to er immediately as you may need more intensive treatment!

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How long does it take for hives to show up from allergic reaction to antibiotic?

How long does it take for hives to show up from allergic reaction to antibiotic?

Can vary: Allergic reactions from taking antibiotics can be an immediate event or can take days to develop. When they take a longer period of time, we call them "delayed hypersensitivity reactions". If there is a concern about an allergy to a medication, it is best to speak with the prescribing physician about what to do next. All the best!

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Does pin and needle sensations (tingling) go away? It's all over my body. It started after a allergic reaction to antibiotic

Does pin and needle sensations (tingling) go away? It's all over my body. It started after a allergic reaction to antibiotic

A couple of wks: If this is truly from a drug reaction, I would expect the symptoms to go away in less than 2 weeks after the drug has been discontinued.

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I took benadryl (diphenhydramine) at 745 for an allergic reaction to antibiotics. When will it kick in?

I took benadryl (diphenhydramine) at 745 for an allergic reaction to antibiotics. When will it kick in?

Dose and frequency: Dependent! So you may have taken it too long ago or not enough. If you're still itching with rash you should see your PCP to make sure that it's not anything more serious that you may need something stronger. So call your doctor and be seen in person for the best care. Always good to get a professional opinion.

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I had an allergic reaction to antibiotics almost a week ago, My face is still swollen! Should I be worried?

I had an allergic reaction to antibiotics almost a week ago, My face is still swollen! Should I be worried?

No, but keep caution: Since you stopped the antibiotic, it should clear from your system, some antibiotics take longer to clear, depends too if you're on other meds, you might want to take an antihistaminic on regular basis, hopefully you don't have horseness or shortness of breath, if so, please see your doctor, goodluck

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How long will it take for numbness and swelling/pressure to subside after an allergic reaction to antibiotics?

How long will it take for numbness and swelling/pressure to subside after an allergic reaction to antibiotics?

Allergy to antibioti: It helps if you treat it with steroids and antihistamines. It shouldn;t take but a few days though occasionally it can last a few weeks.

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I have allergic reaction from antibiotic cephalexin. What is the best antihistamine and how long will it take to clear up, also now have swollen face?

I have allergic reaction from antibiotic cephalexin. What is the best antihistamine and how long will it take to clear up, also now have swollen face?

Have you been seen?: This is an urgent situation. Hopefully, you have been seen by a physician. If not, proceed to the ER if the swelling involves the mouth (potential for progression to throat and breathing incapacity). If you are improved, then an urgent visit in the morning (or Virtual Consult) is recommended for prednisone (for phenomenon of delayed reaction). Cetirizine 10mg twice a day if no contraindications

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I'm having allergic reaction to antibiotic (hives and itching). Can I continue my antibiotic treatment if I pair it with antihistamines?

I'm having allergic reaction to antibiotic (hives and itching). Can I continue my antibiotic treatment if I pair it with antihistamines?

No: An antihistamine would mask some of the obvious signs of the allergic reaction while other more dangerous mediators remain unchecked. There are almost always good alternative antibiotics.

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Have a tooth infection but lm seem to have allergic reaction to antibiotics what can I do get rid of infec in a lot of pain peroxide mouth rinse?

Have a tooth infection but lm seem to have allergic reaction to antibiotics what can I do get rid of infec in a lot of pain peroxide mouth rinse?

Allergies: Some people have reactions to antibiotics but are not really allergic, or they are allergic to one but not another. You cannot fix this problem without seeing a dentist. Please call a dentist for an appointment and feel better soon.

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I had an allergic reaction to antibiotics and the rash is getting worse. I had blisters in mouth, genitals, and now they are in my nose. Benadryl (diphenhydramine)?

I had an allergic reaction to antibiotics and the rash is getting worse. I had blisters in mouth, genitals, and now they are in my nose. Benadryl (diphenhydramine)?

You need a doctor!: Benadryl (diphenhydramine) will not do the trick!! You need to get yourself to a doctor asap. Blisters in the area reported imply something more serious like Stevens Johnson syndrome and you really shouf NOT be treating this yourself. Go to the ER or your own doctor. Don't waste time treating this yourself

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How typical is an allergic reaction to the antibiotic keflux?

How typical is an allergic reaction to the antibiotic keflux?

Atypical: This medication is safe. A small percentage of people develop allergy, which can be an immediate allergic reaction to Keflex alone, or to the family of antibiotics related to Keflex. Sometimes, particularly in cases of mononucleosis, a rash that is confused with allergy develops after antibiotics are taken. It is best to discuss any symptoms with a physician well-practiced in diagnosing allergy

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Can someone get an allergic reaction to an antibiotic after finishing the course?

Can someone get an allergic reaction to an antibiotic after finishing the course?

Yes: Yes, you can get the allergic reaction afterwards. Some physicians refer to this as delayed allergic reaction.

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I am having an allergic reaction to an antibiotic, what would be my best course of action?

I am having an allergic reaction to an antibiotic, what would be my best course of action?

Stop the medication: Call your prescriber as soon as possible and ask your prescriber advice. If you feel your mouth and throat getting swollen and having trouble to breath have someone to take you to ER.

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How can I avoid another allergic reaction to an antibiotic medicine if allergic to penicillin?

How can I avoid another allergic reaction to an antibiotic medicine if allergic to penicillin?

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.

Dr. John Chiu
1,036 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


Dr. John Leander Po
1,117 Doctors shared insights

Antibiotic (Definition)

An antibiotic is a medicine that slows, stops, or kills germs. The germs are usually bacteria causing an infection in a person, so the person uses antibiotics to help his body get ...Read more