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Doctor insights on: Allergic Reaction To Antibiotic Keflex Cephalexin

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My 2 1/2 year has an allergic reaction to keflex has hives all over body how much Benedryl can I give her she is 28 lbs?

My 2 1/2 year has an allergic reaction to keflex has hives all over body how much Benedryl can I give her she is 28 lbs?

Benadryl (diphenhydramine) dosing: Benadryl (diphenhydramine) is effective between 0.5 to 1.0 mg/kg per dose every 8-12 hrs. Based on pt being 28 lbs then a tspn of benadryl (diphenhydramine) 12.5mg/5ml will give pt 12.5 mg which is about 1 mg/kg.

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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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I was given Keflex around 3 months ago for Hidradenitis. I had an allergic reaction and stopped taking it. I've had hives ever since. Why is that?

I was given Keflex around 3 months ago for Hidradenitis. I had an allergic reaction and stopped taking it. I've had hives ever since. Why is that?

Not Keflex: HIves is a particular kind of rash, and rarely lasts more than a few days. And any rash due to cephalexin (Keflex) allergy would not last more than 1-2 weeks after stopping the drug. So whatever the cause of your current rash, it probably isn't hives and cephalexin isn't the cause. If you're taking any other medications, you might be allergic to one of them. Discuss with your doctor.

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Always fine w penicillin, but had extreme allergic reaction reaction to keflex! Does that mean I am now also allergic to penicillin for sure?

Always fine w penicillin, but had extreme allergic reaction reaction to keflex! Does that mean I am now also allergic to penicillin for sure?

Not necessarily: While penicillin and Cephalexin (keflex) share some features, allergy to one does not necessarily to one mean that you are allergic to the other. See a board-certified allergist/immunologist to sort things out.

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I had a severe allergic reaction to keflex. Can I trust taking other antiobios in the future without being pre-tested? How to know if allergic again?

I had a severe allergic reaction to keflex. Can I trust taking other antiobios in the future without being pre-tested? How to know if allergic again?

Many options: Antibiotics are in a number of chemical classes. With a severe reaction to Keflex (also called cefazolin), you should avoid antibiotics in the cephalosporin and probably the penicillin class, as there is a higher chance of cross reactivity. Typically, we will give antibiotics in a different chemical class rather than testing. For you, examples may be clindamycin, Ciprofloxacin or vancomycin.

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I read that the flu shot is made from antibiotics. Safe for people allergic to keflex and penicillin?

I read that the flu shot is made from antibiotics. Safe for people allergic to keflex and penicillin?

No/ Yes: Influenza vaccines are made with dead viral antigens or inactivated live virus. They are not made with antibiotics and can be given to anyone who is allergic to antibiotics.

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Why would I suddenly have so many med allergies (hives, etc?) allergic to nsaids, opiates, keflex, and more. All within a couple yrs. Why?

Why would I suddenly have so many med allergies (hives, etc?) allergic to nsaids, opiates, keflex, and more. All within a couple yrs. Why?

It is uncommon: First you need to describe what kinds of problem you have had with each of the drugs since some may not really be from an allergy. Becoming "allergic" to drugs with unrelated chemical structure in 2 years is also rare. You need to consult an allergist to help you sort this out.

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Having the worst yeast infection of my life. Can the antibiotic cephalexin (keflex) cause this?

Having the worst yeast infection of my life. Can the antibiotic cephalexin (keflex) cause this?

Yes: Patients on Keflex can get yeast overgrowth and develop thrush, perianal and vaginal yeast infections. If your yeast infection is not responding to topical treatments ask your doctor about prescribing Fluconazole tablets for you.

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Is it safe to use keflex/cephalexin antibiotics 500mg 3x a day to treat possible mouth infection due to a burn during pregnancy? I'm 17 weeks pregnant

Is it safe to use keflex/cephalexin antibiotics 500mg 3x a day to treat possible mouth infection due to a burn during pregnancy? I'm 17 weeks pregnant

Yes: Antibiotics of the cephalosporin class are generally considered safe during pregnancy if prescribed. However, most burns do not require antibiotic treatment and respond well to just keeping the area clean. A Dentist or doctor can prescribe an oral rinse if needed, but generally just brushing the teeth and rinsing with water twice a day is sufficient to allow healing of a hot food type mouth burn

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Can you tell me what kind of infections/illnesses is the antibiotic, "keflex" prescribed for?

Keflex: It is usually given to kill what is called gram positive organisms that cause skin and soft tissue infections, it has a gram negative coverage too and can be used for urinary tract infections, so many other clinical conditions can be treated with keflex.

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Is it OK to breastfeed while taking oxycodin and keflex? I remember they ok ED it when the. Any was born but the antibiotics is new

Is it OK to breastfeed while taking oxycodin and keflex? I remember they ok ED it when the. Any was born but the antibiotics is new

Keflex is fine: It is fine to take Keflex while breastfeeding. Oxycodone is excreted in breast milk and the clinical significance of this to the baby is unknown. Be sure you are talking to your doctor about the fact that you are breast feeding so that they can make the safest choice for pain management for you.

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I am on birthcntrl and took antibiotics. I had sex everyday while on keflex. Now I'm 3 days late, with very light pink bleeding. Digital test said no?

Antibiotics vs BCP: Study after study shows that only Rifampin affects the effectiveness of birth control pills. So as long as you take your bcp at same time every day, your chances of getting pregnant are slim. Check out http://www. Mayoclinic. Com/health/birth-control-pill/wo00098/nsectiongroup=2 & http://www. Plannedparenthood. Org/health-topics/ask-dr-cullins/dr-cullins-birth-control-5444.Htm.

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My father has cellulitis is it contagious to me? He has been prescribed keflex as an antibiotic.

My father has cellulitis is it contagious to me? He has been prescribed keflex as an antibiotic.

It can be. ..: If the the bacteria enters your body and your body is not able to fight it, you may become infected.

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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