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Doctor insights on: Is Cephalexin In The Amoxicillin Family

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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

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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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?

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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Its 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?

Its 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 your 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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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 like 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

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I have had a sore throat for 2 months. I've taken amoxicillin and cephalexin and neither have helped. My doc said there's no sign of infection anymore?

I have had a sore throat for 2 months. I've taken amoxicillin and cephalexin and neither have helped. My doc said there's no sign of infection anymore?

Sore throat: There are various reasons besides an infection that can cause a sore throat. Two of the most common are post nasal drip which might be associated with nasal congestion and cough. Acid reflux from your stomach which can cause heartburn but also can make your throat hurt. If you have been checked and told there is no infection it would be good to be evaluated for those mentioned. ...Read more

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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

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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 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?

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 a 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 a 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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What is the difference between cephalexin and amoxycillin? What are they used for?

Different Antibiotic: Amoxicillin is an antibiotic in penicillin class and Cephalexin is a cephalosporin class antibiotic
these are both antibiotics and use to treat various infections if and when indicated and available in us by prescription only. ...Read more

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Have been given Cephalexin for UTI but made me sick and its weekend here so can I take Amoxycillin until I can see my doc again? Will it work?

UTI treatment: Many bacteria causing UTIs are resistant to amoxicillin; it might work but not reliable. How did cephalexin make you sick? It rarely causes any side effects and safest to continue it rather than amox. Your doctor’s office probably can advise by phone. ...Read more

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I went the ER and I told them that I was allergic to amoxicillion. The doctor gave me a prescription for cephalexin. Should I take the cephalexin?

I went the ER and I told them that I was allergic to amoxicillion. The doctor gave me a prescription for cephalexin. Should I take the cephalexin?

Depends: Cephalexin is very close structurally to penicillin. It depends on what your allergic reaction to pcn is. If it is anaphylaxis, then stay away. If it is mild, then call your primary doctor since there is no guarantee you will have a reaction but better to be safe. ...Read more

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Which of these antibiotics for cold interfere with Yaz (drospirenone and ethinyl estradiol) (birth control pills) - Cefalexin, Ospen, Amoxicillin, or any other in that category?

Which of these antibiotics for cold interfere with Yaz (drospirenone and ethinyl estradiol) (birth control pills) - Cefalexin, Ospen, Amoxicillin, or any other in that category?

Penicillins mostly: Antibiotics may interfere with the effectiveness of birth control pills. Have they ever lead to failure of birth control? Not conclusively although it is theoretically possible. Mid cycle spotting could be a sign they are adversely affecting efficacy.
Rifampin, Penicillins like Ospen and amoxicillin can do it. Cephalexin probably not.
Stop them as soon as you can. ...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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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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Been prescribed Cefalexin and amoxicilin for my sinusitis and ear infection. Do these work well together? It doesn't seem like a usual prescription.

Somewhat: Usually both aren't prescribed at the same time, but your physician may have a good reason for doing it that I'm not aware of. ...Read more

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Is amoxicillin in the Ceclor family?

Is amoxicillin in the Ceclor family?

No: Amoxicillin is a type of penicillin. Ceclor is a type of cephalosporin. Penicillins and cephalosporins are both beta-lactam antibiotics. ...Read more

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My daughter 16 is a 2 yr survivor of hogkins. She just found a lump in the same area as before. Family dr gave amoxil (amoxicillin). Lump still there. Advice pls.?

See your oncologist: It is very important any enlarged lymph nodes be evaluated. Hodgkins is very responsive to therapy, but can recur. It is a curable cancer even if it does come back. Please call her oncologist asap to have her seen. This may be an infection, but a cancer specialist needs to evaluate her. ...Read more

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Hello Jonathan I would like to know if I could take benadryl night time while on amoxicillin, I have had pneumonia two moths ago and now I have the same symptoms I went to my family doctor and all he did was give me amoxicillinan, so far it hasn't do

Mgt: Most respiratory illness, including bronchitis infections are caused by viruses. Since you were treated for a bacterial illness, there should be diminished fever and improvement during the next week. Watch for any signs of fever, chills, thick sputum and if these occur please notify your PCP. A chest radiograph can be performed at that time if needed. A virtual appt to discuss online advised. ...Read more

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If I have loss of smell and congestion for an extended period of time should I see an ENT? Family practice doctor prescribed amoxicillin with no notic

If I have loss of smell and congestion for an extended period of time should I see an ENT? Family practice doctor prescribed amoxicillin with no notic

ENT or allergist: If you think this congestion is chronic and antibiotics did not clear it up then try an antihistamine like loratadine and if that does not help then see an ENT or an allergist. ...Read more

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Will amoxicillin cause Stephen Johnson syndrome I going to family dr face swollen I think tooth infection but med phobic bad and dental phobia?

Probably Not: Stephens-Johnson syndrome is a rare disease that affects fewer than six people per million per year.
Unless you have had SJS before, with amoxicillin or another drug, the chances you will get it are vanishingly small. See your dentist immediately. Perhaps he can treat you without giving you an antibiotic. He can definitely avoid amoxicillin if this is a worry for you. Good luck ...Read more

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Severe headache especially behind left eye for 7 days. Had sweats, cold chills and vomiting for 4 days. Family doctor put me on cephalexin 2000 mg.

Severe headache especially behind left eye for 7 days. Had sweats, cold chills and vomiting for 4 days. Family doctor put me on cephalexin 2000 mg.

Eye pain: The best way to start the evaluation would be to see an ophthalmologist for a complete eye examination to see if an explanation can be found for your symptoms or to decide what he next step should be. The initial impression of your family doctor suggests a sinusitis and the use of the antibiotic. If this does not resolve the issue then I would suggest following through with an ophthalmologist. ...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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I've had cold for about 3 weeks. But as the days pass, it only gets worse. What can I do? I've been on z-pack, amoxicillin, augmentin, cephalexin, etc

Duplicate question: Already answered. See my previous reply. This is not a bacterial infection and no antibiotic will make it better. Discuss with your personal physician. ...Read more

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Tried trimethoprim, nitrofurantoin and cephalexin for uti. Nothing has worked so far. I'm allergic to augmentin (amoxicillin and clavulanate) and penicillin- what else can I try?

Infectious dis doc: First the problem may be from inflammation and not infection. 2nd the organ may not be sensitive to these antibiiotics 3rd there may be obstruction or a stone somewhere along the urinary tract. You need to see an infectiious disease and/or urology specialist. ...Read more

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Which antibiotic is safer for the ears (not ototoxic) Augmentin (amoxicillin and clavulanate) (Amoxicillin and Clavulanate Potassium) or Cephalexin. Please advise?

Which antibiotic is safer for the ears (not ototoxic) Augmentin (amoxicillin and clavulanate) (Amoxicillin and Clavulanate Potassium) or Cephalexin. Please advise?

Neither one: None of the 3 components (Amoxicillin, Clavulanate, Cephalexin) of these antibiotics are ototoxic. Also, the potassium in the Clavulanate potassium is not enough to even worry about. It is only there to marry up with Clavulinic acid and make a neutral salt. ...Read more

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Does amoxicillin go bad?

Yes: All drugs eventually go bad. All drugs have an expiration date on the bottle. The drug is not necessarily inactive after this expiration date but has only been tested by the manufacturer to be active for that length of time. ...Read more

Dr. Milroy Samuel
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Keftabs (Definition)

Keftabs is a first generation cephalosporin which is a kind of cephalosporin type drug (anti-bacterial ...Read more


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Amoxil (Definition)

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