Metronidazole (Oral) (Flagyl; Flagyl 375; Flagyl ER; Helidac Therapy) - Drugs Information, Side Effects, & Interactions

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Metronidazole (me-troe-NI-da-zole)

Treats infections. Belongs to a class of drugs called antibiotics.

Flagyl ER, Flagyl, Helidac Therapy, Flagyl 375
There may be other brand names for this medicine.

You should not use this medicine if you have ever had an allergic reaction to metronidazole.

Tablet, Capsule, Long Acting Tablet, Liquid

Your doctor will tell you how much medicine to take and how often.
You may take the capsule, tablet, or oral liquid with food or milk to avoid stomach upset.
It is best to take the extended-release tablet on an empty stomach, one hour before you eat a meal or two hours after a meal.
Swallow the extended-release tablet whole. Do not crush, break, or chew it.
Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup.
Take your medicine as scheduled until it is all gone, even if your symptoms go away. If you stop taking metronidazole too soon, your infection may return.
If you do not get better in a few days or if your symptoms get worse, call your doctor.

If a dose is missed:

Take the missed dose as soon as possible.
If it is nearly time for your next dose, wait until then to take the medicine and skip the missed dose.
You should not use two doses at one time.

Keep the medicine at room temperature in a tightly closed container, away from heat, direct light, and moisture.
Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.
Keep all medicine away from children.

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

Do not drink alcohol or take medicine with alcohol in it, such as cold or cough medicines. Wait at least one day after stopping metronidazole before drinking alcohol.
Make sure your doctor knows if you are taking blood thinners such as Coumadin®, disulfiram (Antabuse®), phenobarbital (Donnatal®), phenytoin (Dilantin®), or cimetidine (Tagamet®).

If you are pregnant or breastfeeding, talk to your doctor before taking this medicine.
Check with your doctor before taking metronidazole if you have liver or heart disease, a nerve disease (such as epilepsy), or a blood disorder.
If you are taking this medicine for a genital infection, make sure that your sexual partner also gets treated, even if he or she has no symptoms.
Because this medicine makes some people dizzy or lightheaded, be careful when driving a car or using machinery.
This medicine may turn your urine a reddish-brown color. This is normal.

Call your doctor right away if you notice any of these side effects:

If you notice these less serious side effects, talk with your doctor:

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