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Doctor insights on: Ampicillin And Amoxicillin

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Which one is better ampicillin or amoxicillin?

Which one is better ampicillin or amoxicillin?

Neither: Ampicillin and Amoxicillin have an identical bacterial spectrum of activity. Amoxicillin is absorbed better than Ampicillin when they are given by mouth. Ampicillin can be given in higher doses IV while Amoxicillin can only be given orally. ...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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What is the usual dose of ampicillin and amoxicillin to cure bv?

What is the usual dose of ampicillin and amoxicillin to cure bv?

BV: Ampicillin and Amoxicillin are neither effective Antibiotics for BV nor first choice, please talk to your provider for appropriate diagnosis and treatment. ...Read more

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Just diagnosed with strep throat, would like to take ampicillin in lieu of amoxicillin because I already have it. What is proper dosage each day?

Just diagnosed with strep throat, would like to take ampicillin in lieu of amoxicillin because I already have it. What is proper dosage each day?

250mg 4xday x10 days: Normal dose would be 250mg, 4 times a day, for 10 days. Be sure medication you have is not expired. Hope this helps. Best of luck. Dr R ...Read more

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What antibiotic would be most effective for pneumonia-- amoxicillin, ampicillin, or penicillin?

What antibiotic would be most effective for pneumonia-- amoxicillin, ampicillin, or penicillin?

Depends: Pneumonia is an infection of the tissues of the lungs, and can be caused by many different organisms, including viruses, bacteria, atypical organisms, fungi, and even parasites, among others. The antibiotic of choice will depend on the bug and its sensitivity to antibiotics (if at all). ...Read more

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Is amoxicillin and ampicillin the same?

Is amoxicillin and ampicillin the same?

No/very similar: Amoxicillin and Ampicillin are not the same but they are very similar. Amoxicillin and Ampicillin have an identical bacterial spectrum of activity. Amoxicillin is absorbed better when given by mouth. Ampicillin is available in IV and oral form while Amoxicillin is only given orally. ...Read more

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Whats the difference between amoxicillin and ampicillin?

One oral, one IV: Both are actually the same medicine, but Amoxicillin is the oral form of the medication and Ampicillin is the IV form of the medicine. I have actually also seen a few times oral Ampicillin listed as being available, but usually the oral form that is most stable and palatable is the amoxicillin. ...Read more

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I ran out of my amoxicillin. May i switch from taking amoxicillin to ampicillin?

I ran out of my amoxicillin. May i switch from taking amoxicillin to ampicillin?

Maybe not, however: Though both are penicillins, the types of bacteria each affects may be different. Best to check with your physician who may have the urine culture to make a better judgement. ...Read more

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I'm on ampicillin for sinusitis but have gotten much worse on it, does that mean that amoxicillin would not work as well? Always taken Amox in past

 I'm on ampicillin for sinusitis but have gotten much worse on it, does that mean that amoxicillin would not work as well?  Always taken Amox in past

Its virus..: If you have sinus infection - it could be VIRAL- antibiotics as Amoxicillin are indicated ONLY for severe BACTERIAL infection. Headache, mucus, drainage is part of congestion better treated with nasal saline rinses, steam inhalation, hydration, rest... symptomatic treatment. Bacteria may be as well resistant since you used Amox too much in past! Consume probiotic rich diet to restore immune system ...Read more

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Had to take amoxicillin, diaflucan & ampicillin b2b. Still on amp. Had unprotected sex last night. Am on second pill of BC pack. Am I safe?

Had to take amoxicillin, diaflucan & ampicillin b2b. Still on amp. Had unprotected sex last night. Am on second pill of BC pack. Am I safe?

From pregnancy?: If you are asking if you are protected from pregnancy, the answer is "probably", but not 100%. There is an inherent 0.1% failure rate of BC pills when taken perfectly, and there is the possibility that antibiotics can make them less effective, though no one has studied how much less. As for being protected from STDs, there are many infections resistant to ampicillin, so you are not safe there. ...Read more

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Had to take amoxicillin, diaflucan & ampicillin b2b. Still on amp. Had unprotected sex last night. Am on second pill of BC pack. Am I safe?

Had to take amoxicillin, diaflucan & ampicillin b2b. Still on amp. Had unprotected sex last night. Am on second pill of BC pack. Am I safe?

Probably: you are correct to be concerned about your protection! Any time you take antibiotics, there can be interference with your oral contraceptives! In this case, you are less likely to have a problem due to the timing with your cycle BUT you should ALWAYS use back up protection when taking antibiotics and don't forget that you need protection against STDs! ...Read more

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Which is better , after wisdom tooth removal , amoxicillin or ampicillin?

Which is better , after wisdom tooth removal , amoxicillin or ampicillin?

Ampicillin/amoxicill: These are basically the same drug in terms of antibiotic efficacy. Amoxicillin is absorbed higher and more completely in the intestinal tract and so with less drug reaching the colon there may be fewer complications, like clostrid. Difficile infection. Choice is a toss up in terms of killing bacteria. ...Read more

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Please dr, which of these 3 antibiotic is better for swollen gum, Ampiclox or amoxil (amoxicillin) or ampicillin?

Augmentin (amoxicillin and clavulanate): Augmentin (amoxicillin and clavulanate) (amoxicillin/ clavulanate) would be better than any of the 3 you listed. Note, if MRSA involved Clindamycin would be better. ...Read more

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Taking Amoxicillin 500mg twice a day for Strep. Also taking 250mg Ampicillin to keep away GBS UTIs during pregnancy. Will one decrease other's work?

Same: They are almost the same. Stop the ampicillin. Do not take these meds without a clear indication. Prolonged or frequent exposure can cause C. Diff. which is very serious. ...Read more

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15 weeks pg Was taking 250mg Ampicillin every 6 hrs for Strep throat for 2 days. Now switch to 500mg Amoxicillin 2x/day. Took Amp at 1:30 when to take?

Doesn't matter: You can start the amoxicillin whenever you wish. These are extremely safe drugs: you could take ten times as much of either one, or both of them, without harm to you or your baby. Don't worry about it. Best wishes for quick success in treating your infection and for a healthy pregnancy and baby. ...Read more

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I am pregnant and due anytime now.I have been talking amoxicillin and ampicillin.will these show positive for cocaine when they do a drug test on baby?

I am pregnant and due anytime now.I have been talking amoxicillin and ampicillin.will these show positive for cocaine when they do a drug test on baby?

No: No. Amoxicillin and Ampicillin are 'penicillin' type antibiotics and does not contain cocaine. Therefore, if you have not used cocaine then there should be no cocaine in your baby's system to produce a positive 'cocaine' test. ...Read more

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I am debating wether to give my 63 year old mother amoxicillin or ampicillin. She is in bed now, and does not have empty stomach. She has slight fever?

I am debating wether to give my 63 year old mother amoxicillin or ampicillin. She is in bed now, and does not have empty stomach. She has slight fever?

No difference: Ampicillin and amoxicillin are virtually identical; either drug is equally effective, but amp is taken more frequenlty and diarrhea is a more common side effect. However, nobody should take antibiotics without professional advice. If she has a bacterial infection, amp or amox isn't necessarily a good choice; best antibiotic depends on the specific illness and the particular bacteria causing it. ...Read more

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Will Augmentin (amoxicillin and clavulanate) work for a positive semen culture for enterrococcus faecalis? I've been on macrobid, zyvox, and ampicillin already.

Will Augmentin (amoxicillin and clavulanate) work for a positive semen culture for enterrococcus faecalis? I've been on macrobid, zyvox, and ampicillin already.

It depends: It depends on what the antibiotic sensitivity testing showed on the culture that was done. If the sensitivity showed the bacteria was sensitive to Augmenting it should work. You should discuss this with your treating doctor. ...Read more

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Dr. Amanda Itzkoff
74 doctors shared insights

Principen (Definition)

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


Dr. Ira Katz
74 doctors shared insights

Omnipen (Definition)

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