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Doctor insights on: Keflex Vs Amoxicillin

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I used to take amoxicillin, then my doctor gave me keflex. I ended up being very allergic to keflex, how am I allergic to one but not the other?

I used to take amoxicillin,  then my doctor gave me keflex. I ended up being very allergic to keflex, how am I allergic to one but not the other?

Not a penicillin: These are different classes of drugs. Amoxicillin is a penicillin type drug. Keflex is a cephalosporin. Some people are allergic to both but it is entirely possible to be allergic to one and not to the other. ...Read more

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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


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Should i take amoxicillin or keflex for tooth infection?

Should i take amoxicillin or keflex for tooth infection?

Amox or Penicillin?: Both are commonly prescribed effective antibiotics but it won't matter which one you take as without appropriate dental treatment to remove the cause of the infection, you won't resolve the problem. This requires professional dental treatment. ...Read more

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Im allergic to amoxicillin can i take keflex 500 mg, from what my mom says all that happens if i take amoxicillin is i get a rash but i dont k ow if t?

Im allergic to amoxicillin can i take keflex 500 mg, from what my mom says all that happens if i take amoxicillin is i get a rash but i dont k ow if t?

Most people can: Studies have found a low incidence of cephalosporin (of which Keflex is one) allergy among penicillin allergic people. The rash from amoxicillin is also mediated by immune mechanism other than IgE. Thus your risk for an allergic reaction is likely no higher than someone who has never had an reaction to amoxicillin. ...Read more

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Should I take amoxicillin or Keflex for an infected belly button piercing?

Skin structure: Both antibiotics are efficacious, but Cephalexin (Keflex) is more sensitive for skin structure than amoxil (amoxicillin) if comparing the 2. You should of course discuss with your Doctor who should be evaluating you and properly diagnosing you to Rx the best medication for you. Good luck. ...Read more

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What to do if I have strept throat, and im allergic to penicillin, can take amoxicillin or keflex instead?

What to do if I have strept throat, and im allergic to penicillin, can take amoxicillin or keflex instead?

No : Amoxicillin is within penicillin class and the risk of having a reaction is significant so it should be avoided. There is controversy about the risk of cross reaction between class of antibiotics penicillin and cephalosporin (keflex). It appears the risk is low (but not 0). If penicillin allergy was years ago, skin testing for penicillin can help know if it is still there. Allergist can help. ...Read more

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What to do if I have strept throat, and I'm allergic to penicillin, can take amoxicillin or keflex instead?

What to do if I have strept throat, and I'm allergic to penicillin, can take amoxicillin or keflex instead?

No to Amoxicillin: You shouldn't take Amoxicillin and there is a 1 in 10 chance that you'll have a reaction to Keflex. If your allergic reaction to penicillin wasn't severe, (anaphylaxis or other), then it would be reasonable to try Keflex ...Read more

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I have a uti that wont go away i have been on trimethoprim amoxicillin nitrofurantoin and now on keflex i got rid of it but it came back ?

I have a uti that wont go away i have been on trimethoprim amoxicillin nitrofurantoin and now on keflex i got rid of it but it came back ?

Get checked again: Return to your provider and request a urine culture with sensitivities to definitively identify the bacteria and to treat it with an appropriate antibiotic. Be sure to take the complete course of antibiotics. Also, you may need a pelvic exam to rule out vaginal infections that may be contributing to your recurrent symptoms. Hope you feel better soon! ...Read more

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I never took keflex before. I took amoxicilin before, I'm not allergic to it. Is there anyway I can try to see if Im allegric before I take full dose?

No: Most people do not become allergic to antibiotics yet it can develop at any time. Thus there is no way to tell ahead of time whether you may be allergic to an antibiotic or not. ...Read more

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Will amoxicillin work the same as cephalexin?

Will amoxicillin work the same as cephalexin?

See below: Amoxicillin and Cephalexin have different antibacterial spectra. If an infecting organism is sensitive to both drugs they will work equally well. But if an infection is due to enterococcus Amoxicillin will usually work while Cephalexin will not. Conversely if an infection is due to mssa Cephalexin will work while Amoxicillin will not. ...Read more

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If I am allergic to amoxycillin will i be allergic to keflex?

Unlikely: Amoxicillin is in the penicillin family; Keflex is a cephalosporin. Only about 10% of penicillin-allergic people react to cephalosporins, so it is generally ok to take a cephalosporin unless there has been a life-threatening allergic reaction to a penicillin. You should discuss with your physician whether a cephalosporin is appropriate for you. ...Read more

Dr. Philip Miller
1,086 doctors shared insights

Amoxil (Definition)

Amoxil is a third generation penicillin which is a kind of penincillin type drug (anti-bacterial ...Read more