Compare Augmentin vs. Flagyl

Head-to-head comparisons of medication uses, side effects, ratings, and more.

Augmentin (amoxicillin / clavulanate)

Prescription only

Flagyl (metronidazole)

Prescription only
Treats bacterial infections.

Augmentin (amoxicillin / clavulanate) is first-choice antibiotic for most common types of infections. However, it may not work against more serious or uncommon types of infections.

5.3/ 7 average rating with 1034 reviewsforAugmentin
Treats and prevents bacterial infections.

Flagyl (metronidazole) is very good at treating certain bacterial infections, but you can't have any alcohol while on it since it'll make you throw up a lot.

Upsides
  • Available as generic product.
  • Available in tablet, capsule, and liquid forms.
  • Used to treat most common types of bacterial infections.
  • Side effects are generally not too bad compared to other antibiotics.
  • Flagyl (metronidazole) is good at killing a variety of bacteria.
  • Unlike many other antibiotics, Flagyl (metronidazole) is less likely to make bacteria resistant to it.
  • Most forms are available as a generic, so it's relatively cheap.
Downsides
  • Many bacteria have developed resistance to this antibiotic.
  • Can cause diarrhea, nausea, and vomiting.
  • Birth control pills may not work as well to prevent pregnancy when taking this medication.
  • You can't drink alcohol while on Flagyl (metronidazole), and for at least 3 days after you finish it.
  • Side effects can include nausea, headache, stomach upset, and a metallic taste in your mouth.
  • If you're taking Flagyl (metronidazole) for a long time, there's a risk of more side effects, such as nerve damage.
  • If you're on blood thinners, let your doctor know. Flagyl (metronidazole) can interact with your medicines and make you more likely to bleed.
Used for
Dosage forms
  • Pill
  • Chewable tablet
  • Extended release
  • Liquid
  • Pill
  • Extended-release pill
  • Injection
Price
Lowest price near you
$300.98
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Lowest price near you
$9.66
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Reviews
1034 
68%
think this treatment is worth it
52%
think this treatment works well
13%
think this treatment is a hassle

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Side effects
3possible side effects
  • Diarrhea
    15%
  • Vaginal yeast infection
    3%
  • Nausea
    2%
See more detailed side effects
10possible side effects
  • Headache
    18%
  • Nausea
    10%
  • Metallic taste
    9%
  • Genital itching
    5%
  • Dizziness
    4%
  • Diarrhea
    4%
  • Stomach problems
    4%
  • Overgrowth of yeast
    3%
  • Stuffy nose
    3%
  • Menstrual cramps
    3%
See more detailed side effects
Risks and warnings
  • Serious allergic reaction

    History of penicillin allergy

    ...and 1 more risk factors

  • Liver damage

    Existing liver problems

    ...and 1 more risk factors

  • Superinfection

    Taking Augmentin (amoxicillin / clavulanate) for a long time

    ...and 2 more risk factors

  • Rash

    Mononucleosis

See more detailed risks and warnings
  • Seizure or brain problems

    Taking high doses of Flagyl (metronidazole)

    ...and 1 more risk factors

  • Nerve damage

    Taking high doses of Flagyl (metronidazole)

    ...and 1 more risk factors

  • New infection while taking Flagyl (metronidazole)

    Taking Flagyl (metronidazole) incorrectly

  • Interaction with alcohol

    Drinking alcohol while taking Flagyl (metronidazole)

See more detailed risks and warnings