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Flagyl ER

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Flagyl ER (Metronidazole) is an antibiotic. It fights bacteria in your body.

Drug Name

Flagyl ER (Metronidazole)

Drug Uses

Flagyl ER is an antibiotic. It fights bacteria in your body. Flagyl ER is used to treat bacterial infections of the vagina, stomach, skin, joints, and respiratory tract. This medication will not treat a vaginal yeast infection. Flagyl ER may also be used for purposes other than those listed in this medication guide.

How Taken

Take the extended-release form of metronidazole (Flagyl ER) on an empty stomach, at least 1 hour before or 2 hours after eating a meal. Take this medication for the entire length of time, prescribed by your doctor. Your symptoms may get better before the infection is completely treated. Flagyl ER will not treat a viral infection such as the common cold or flu.

Drug Class and Mechanism

Flagyl ER is an antibiotic effective against anaerobic bacteria and certain parasites. Anaerobic bacteria are single-cell living organisms that thrive in low oxygen environments and can cause disease in the abdomen (bacterial peritonitis) liver (liver abscess), and pelvis ( abscess of the ovaries and the fallopian tubes). Giardia lamblia and ameba are parasites that can cause abdominal pain and chronic diarrhea in infected individuals. Flagyl ER selectively blocks some of the cell functions in these microorganisms, resulting in their demise.

Missed Dose

Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at your next regularly scheduled time. Do not take extra medicine to make up the missed dose.


Flagyl ER should be stored at room temperature and protected from light.