April 18, 2014
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Drug Factsheets

 Health Home >> Medications 

Flagyl

(metronidazole)

DIN (Drug Identification Number)

01926861 FLAGYL 10% VAGINAL CREAM
01926853 FLAGYL 500MG CAPSULE

How does Flagyl work? What will it do for me?

Metronidazole belongs to the class of medications called antibiotics. It is used to treat infections caused by certain bacteria. It is most commonly used for abdominal, vaginal, and intestinal infections. Metronidazole works by killing bacteria and parasites.

This medication may be available under multiple brand names and/or in several different forms. Any specific brand name of this medication may not be available in all of the forms or approved for all of the conditions discussed here. As well, some forms of this medication may not be used for all of the conditions discussed here.

Your doctor may have suggested this medication for conditions other than those listed in these drug information articles. If you have not discussed this with your doctor or are not sure why you are taking this medication, speak to your doctor. Do not stop taking this medication without consulting your doctor.

Do not give this medication to anyone else, even if they have the same symptoms as you do. It can be harmful for people to take this medication if their doctor has not prescribed it.

How should I use Flagyl?

The dose of metronidazole depends on the condition being treated. The usual adult dose of metronidazole is 500 mg taken by mouth every 8 hours or twice daily. For treatment of trichomoniasis, a single dose of 2,000 mg may be taken orally after a meal. Many other doses exist according to the infection being treated.

Metronidazole may be taken with or without food. If it causes stomach upset, it is best taken with food or milk.

Metronidazole vaginal cream or gel is used for vaginal infections. The dose is applied into the vagina usually once or twice a day. See the package insert or talk to your health care provider about how to use the applicator correctly.

Many things can affect the dose of medication that a person needs, such as body weight, other medical conditions, and other medications. If your doctor has recommended a dose different from the ones given here, do not change the way that you are taking the medication without consulting your doctor.

It is important to take this medication regularly and exactly as prescribed by the doctor. Keep taking this medication until the prescription is complete even if you feel better. If you miss a dose, take it as soon as possible and continue with your regular schedule. If it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one. If you are not sure what to do after missing a dose, contact your doctor or pharmacist for advice.

Store this medication at room temperature, protect it from light and moisture, and keep it out of the reach of children.

Do not dispose of medications in wastewater (e.g. down the sink or in the toilet) or in household garbage. Ask your pharmacist how to dispose of medications that are no longer needed or have expired.





What form(s) does Flagyl come in?

Oral capsules
Each pale green and light gray capsule, printed with a symbol and "500", contains metronidazole 500 mg. Nonmedicinal ingredients: black ink, D&C Red No. 33, D&C Yellow No. 10, FD&C Blue No. 1, FD&C Green No. 3, gelatin, lactose monohydrate, magnesium stearate, polacrilin potassium, silicon dioxide, sodium lauryl sulfate, and titanium dioxide. Tartrazine-free.

Vaginal cream
Each tube contains metronidazole 10% w/w in a cream base. Nonmedicinal ingredients: glycerin, glyceryl monostearate, methylparaben, propylparaben, purified water, stearic acid, and trolamine. Tartrazine-free.

Who should NOT take Flagyl?

Do not take this medication if you:

  • are allergic to metronidazole or any ingredients of the medication
  • have a history of blood disorders
  • have a brain (neurological) disorder
  • have an underactive thyroid (hypothyroidism)
  • have underactive adrenal glands (hypoadreanalism)

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