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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 ...Read more

Dr. John Chiu
2,630 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. ...Read more

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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 ...Read more

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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! ...Read more

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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! ...Read more

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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. ...Read more

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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. ...Read more

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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 ...Read more

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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. ...Read more

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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 ...Read more

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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. ...Read more

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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. ...Read more

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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 ...Read more

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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 ...Read more

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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. ...Read more

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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. ...Read more

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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. ...Read more

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How many benadryl (diphenhydramine) is the recommended dose for an adult with an allergic reaction to an antibiotic?

How many benadryl (diphenhydramine) is the recommended dose for an adult with an allergic reaction to an antibiotic?

Label explains: I'd first advise calling your doctor who depending upon the SEVERITY of your reaction may prefer you be seen in the ER. Otherwise, if symptoms are not severe and they've been present for a few hours or so I would simply follow label instructions on the bottle or box of tablets. Careful not to drive after taking them. More questions? Www. Healthtap. Com/drsaghafi Use Key Code: PDXFNR for appointment ...Read more

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I have an allergic reaction to an antibiotic and I have water blisters everywhere. What I can do for comfort?

I have an allergic reaction to an antibiotic and I have water blisters everywhere. What I can do for comfort?

Benadryl (diphenhydramine): Take 25-50mg of benadryl, (diphenhydramine) and stop the offending antibiotic. See your physician as soon as possible to get an alternate agent, and to let them record your allergy. ...Read more

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I had an allergic reaction to the antibiotic batrim and another to klonopin (clonazepam). Do these two drugs have a common ingredient?

I had an allergic reaction to the antibiotic batrim and another to klonopin (clonazepam). Do these two drugs have a common ingredient?

No: These are different drugs, and do not share ingredients. We would need to know what you specifically experienced with these medications to determine whether you're truly "allergic, " or the drugs simply cause unpleasant side effects. ...Read more

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I have a rash all over my body from an allergic reaction to an antibiotic I was taking, can I still lay in a tanning bed?

I have a rash all over my body from an allergic reaction to an antibiotic I was taking, can I still lay in a tanning bed?

Take a break!: I would not advise it at this time as your body is in the midst of a battle against the antibiotic. Your immune system is on high alert and the UV lights may cause the rash to increase. Secondly, much as our culture loves tan skin as a sign of good health it's an incredible health hazard - leads to premature skin aging, wrinkles and sometimes cancer. http://www. Cdc. Gov/cancer/skin/basic_info/indoor_tanning. Htm ...Read more

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Started sulfamethoxazole on tues, today I noticed my lip swelling. Is this an allergic reaction & will the antibiotic still work if im allergic to it?

Started sulfamethoxazole on tues, today I noticed my lip swelling. Is this an allergic reaction & will the antibiotic still work if im allergic to it?

Probably: It sounds like an allergic type reaction (angioedema). You should stop the drug immediately and call your doctor. Avoid sulfa drugs in the future. ...Read more

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While going through an allergic reaction to an antibiotic I was having stinging nerve pain in fingers and toes now all over body can I have MS now?

While going through an allergic reaction to an antibiotic I was having stinging nerve pain in fingers and toes now all over body can I have MS now?

Criteria for MS: Hi JeriS,
Typically symptoms related to MS are on one side of the body but can be both sides as well occasionally. The symptoms typically go away followed by a period with no symptoms followed by returning of symptoms perhaps elsewhere in the body. If this is the scenario you are experiencing then you may need to consult with a Neurologist who can guide you in the right direction.
Best of luck ...Read more

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Is it possible to develop an allergic reaction to an antibiotic while you're taking it? I'm on my second week of amoxicillin and this morning woke up with red bumps all over. I break out in hives with penicillin and sudafed which is why I ask. Thanks.

Amoxicillin: Amoxicillin is very closely related to penicillin. People with a true penicillin allergy like you (causing hives) should not take amoxicillin. I would suggest stopping the medication and calling your doctor right away to find out what to do next. You may need medication to stop the allergic reaction and perhaps a different antibiotic, depending on the reason it was prescribed.

People have been known to show allergic symptoms after taking antibiotics for several days and even if they have taken the same antibiotic before and have not had problems.

I hope this answers your question. Thanks! ...Read more

Dr. John Chiu
1,043 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