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Doctor insights on: Keflex Vs Amoxicillin

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Can I take amoxicillin and keflex back-to-back? I'm six weeks pregnant

Can I take amoxicillin and keflex back-to-back? I'm six weeks pregnant

Probably ok: But check with your doc. We doctors are very concerned about side effects in pregnant women. Better to be safe. ...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


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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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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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I'm 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 don't k ow if t?

I'm 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 don't 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 a 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 had a thrush type of reaction, sore tongue, swollen check, etc. from amoxicillin. Will this likely happen with Keflex?

I had a thrush type of reaction, sore tongue, swollen check, etc. from amoxicillin.  Will this likely happen with Keflex?

Allergic reaction : You have about a ten percent chance of it happening with a cephalosporin such as keflex ...Read more

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I have an uti that won't go away i have been on trimethoprim amoxicillin nitrofurantoin and now on keflex I got rid of it but it came back?

I have an uti that won't 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 I'm allegric before I take full dose?

I never took keflex before. I took amoxicilin before, I'm not allergic to it. Is there anyway I can try to see if I'm 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

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My dentist prescribed me to take cephalexin for my tooth for seven days but for the remaining five days, I switched to amoxicillin. Is it ok?

Maybe: Amoxicillin is also a drug that many dentists use to treat infections of the mouth. Whether it is a good one for you would depend on your specific circumstances and specific type of infection. ...Read more

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It's almost 3 weeks that I've had a cold.I've tried Zithromax and cephalexin, but they haven't helped. So Now I'm trying amoxicillin. What will happen now?

It's almost 3 weeks that I've had a cold.I've tried Zithromax and cephalexin, but they haven't helped. So Now I'm trying amoxicillin. What will happen now?

Stop antibiotics: When cold symptoms don't respond to antibiotics, it is almost never because of a bacterial infection resistant to antibiotics. It means no bacterial infection at all: you have either a virus or allergy symptoms. No antibiotic will help. Taking unnecessary antibiotics is unhealthful, both for you and everyone, by contributing to bacterial antibiotic resistance. Work with your doctor on this. ...Read more

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I got diagnosed with whartons duct sialolithotomy I was prescribed amoxicillin and then cephalexin for the bacteria which one is more effective helpme?

I got diagnosed with whartons duct sialolithotomy I was prescribed amoxicillin and then cephalexin for the bacteria which one is more effective helpme?

Calcification: Calcified blockage of the Parotid Gland duct is not unusual, and may even perforate the duct. Calcification should be removed. Antibiotic coverage is common practice, and you're treating Dentist or preferably Oral Surgeon is the best one to decide the effectiveness of the antibiotics prescribed depending upon your response to the Meds. ...Read more

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What happens if I feel fine taking cephalexin and amoxicillin will I be okay on z-pak (zithromax)?

Different drug: Zithromax is often prescribed to people who are allergic to penicillins (amoxicillin) and cephalosporins (cephalexin). It is possible for a person to be allergic to Zithromax, so monitor yourself closely. There is no good way to predict if you will be allergic to it. I hope this answers your question :) ...Read more

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Can you take cephalexin if you are allergic to augmentin (amoxicillin and clavulanate)?

Can you take cephalexin if you are allergic to augmentin (amoxicillin and clavulanate)?

probably: First of all, how do you know you are allergic to augmentin (amoxicillin and clavulanate)? The medication is actually 2 drugs (amomxicillin+clavulanic acid) and can cause rashes that are not due to allergy. Most patients who develop a rash with Amoxicillin can tolerate cephalexin. To be on th esafe side, see an allergist/immunologist. ...Read more

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So I had a UTI. Amoxicillin 10 days. Didn't work. Went to ER bc of lots of blood & kidney pain. Now 6 days on cephalexin. When does back pain go away?

So I had a UTI. Amoxicillin 10 days. Didn't work. Went to ER bc of lots of blood & kidney pain. Now 6 days on cephalexin. When does back pain go away?

Kidney stone: If you are having ongoing pain 6 days into your second antibiotic, either the bacteria is resistant to keflex, or you have a second issue going on as well as a kidney stone that could cause the blood in your urine and the pain. If kidney stones were not excluded in your prior evaluations, they should be looked for. Have your doctor check the culture results from your previous visits. ...Read more

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Pus-like discharge developed into bloody discharge. Even after 3 weeks of antibiotics — amoxicillin, cephalexin, metronidazole. No pain & itch. Help!

Pus-like discharge developed into bloody discharge. Even after 3 weeks of antibiotics — amoxicillin, cephalexin, metronidazole. No pain & itch. Help!

Discharge: If I understand you correctly, it is important for you to let the doctor who prescribed the meds know what is happening to you.
He/she must see you in follow up ASAP! ...Read more

Dr. Philip Miller
1,140 doctors shared insights

Amoxil (Definition)

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