Compare Cipro vs. Flagyl

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

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Cipro (ciprofloxacin)

Prescription only

Flagyl (metronidazole)

Prescription only
Treats bacterial infections.

Cipro (ciprofloxacin) is a good, cheap antibiotic that treats many types of bacterial infections, but it interacts with some food and drugs.

3.8/ 5 average rating with 755 reviewsforCipro
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
  • Cipro (ciprofloxacin) is available in generic.
  • Cipro (ciprofloxacin) comes in different forms, including intravenous (IV) injection.
  • 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
  • Cipro (ciprofloxacin) should be used with caution if you have kidney problems.
  • If you drink caffeine while on Cipro (ciprofloxacin), you may notice increased effects of the caffeine.
  • Some bacteria have developed resistance to Cipro (ciprofloxacin).
  • Cipro (ciprofloxacin) can interact with many other medications. Tell your doctor and pharmacist what medications, over-the-counter products, and supplements you are taking before starting Cipro (ciprofloxacin).
  • 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.
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Used for
Dosage forms
  • Pill
  • Liquid
  • Injection
  • Extended release pill
  • Pill
  • Extended-release pill
  • Injection
Price
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Reviews
755 reviews so far
63%
saidit'sworth it
53%
saiditworked well
17%
saidit'sa big hassle

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Side effects
2possible side effects
  • Nausea
    3%
  • Diarrhea
    2%
See more detailed side effects
13possible 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%
  • Abnormal urine
    3%
  • Dry mouth
    2%
  • Urinary tract infection
    2%
See more detailed side effects
Risks and risk factors
  • Tendon rupture
    • People over age 60
    • Taking steroid medicine
    • Those with kidney, heart, or lung transplants
  • Myasthenia gravis
    • Myasthenia gravis
  • Diarrhea
  • Nerve damage
  • Central nervous system effects
    • Central nervous system disorders
    • Seizures
  • Heart rhythm problems
    • Use with other QT prolonging drugs
    • History of heart disease
See more detailed risks and warnings
  • Seizure or brain problems
    • Taking high doses of Flagyl (metronidazole)
    • Taking Flagyl (metronidazole) for a long time
  • Nerve damage
    • Taking high doses of Flagyl (metronidazole)
    • Taking Flagyl (metronidazole) for a long time
  • Cancer
  • 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