Flagyl contains the active ingredient metronidazole in the form of capsules, providing 375 mg of metronidazole USP. It is classified as a synthetic nitroimidazole antimicrobial agent. The capsules are designed for oral administration and include inactive ingredients such as corn starch, FD&C Yellow No. 5, gelatin, iron oxide black, magnesium stearate, and titanium dioxide.

How should I use this medication?

Take this medication by mouth with water. Take it as directed on the prescription label at the same time every day. Take all of this medication unless your care team tells you to stop it early. Keep taking it even if you think you are better. Talk to your care team about the use of this medication in children. While it may be prescribed for children for selected conditions, precautions do apply.

Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room at once. NOTE: This medicine is only for you. Do not share this medicine with others.

What if I miss a dose?

If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.

Where should I keep my medication?

Keep out of the reach of children and pets. Store between 15 and 25 degrees C (59 and 77 degrees F). Protect from light. Get rid of any unused medication after the expiration date. To get rid of medications that are no longer needed or have expired: -Take the medication to a medication take-back program. Check with your pharmacy or law enforcement to find a location. -If you cannot return the medication, check the label or package insert to see if the medication should be thrown out in the garbage or flushed down the toilet. If you are not sure, ask your care team. If it is safe to put it in the trash, take the medication out of the container. Mix the medication with cat litter, dirt, coffee grounds, or other unwanted substance. Seal the mixture in a bag or container. Put it in the trash.

NOTE: This sheet is a summary. It may not cover all possible information. If you have questions about this medicine, talk to your doctor, pharmacist, or health care provider.

What side effects may I notice from receiving this medication?

Side effects that you should report to your care team as soon as possible: -Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat -Dizziness, loss of balance or coordination, confusion or trouble speaking -Fever, neck pain or stiffness, sensitivity to light, headache, nausea, vomiting, confusion, which may be signs of meningitis -Heart rhythm changes—fast or irregular heartbeat, dizziness, feeling faint or lightheaded, chest pain, trouble breathing -Liver injury—right upper belly pain, loss of appetite, nausea, light-colored stool, dark yellow or brown urine, yellowing skin or eyes, unusual weakness or fatigue -Pain, tingling, or numbness in the hands or feet -Redness, blistering, peeling, or loosening of the skin, including inside the mouth -Seizures -Severe diarrhea, fever -Sudden eye pain or change in vision such as blurry vision, seeing halos around lights, vision loss -Unusual vaginal discharge, itching, or odor Side effects that usually do not require medical attention (report these to your care team if they continue or are bothersome): -Diarrhea -Metallic taste in mouth -Nausea -Stomach pain

This list may not describe all possible side effects. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What should I tell my care team before I take this medication?

They need to know if you have any of these conditions: -Cockayne syndrome -History of blood diseases, such as sickle cell anemia, anemia, or leukemia -Frequently drink alcohol -Irregular heartbeat or rhythm -Kidney disease -Liver disease -Yeast or fungal infection -An unusual or allergic reaction to metronidazole, other medications, foods, dyes, or preservatives -Pregnant or trying to get pregnant -Breastfeeding

What may interact with this medication?

Do not take this medication with any of the following: -Alcohol or any product containing alcohol -Cisapride -Disulfiram -Dronedarone -Pimozide -Thioridazine This medication may also interact with the following: -Busulfan -Carbamazepine -Certain medications that treat or prevent blood clots, such as warfarin -Cimetidine -Estrogen or progestin hormones -Lithium -Other medications that cause heart rhythm changes -Phenobarbital -Phenytoin

This list may not describe all possible interactions. Give your health care provider a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with your medicine.

What should I watch for while using this medication?

Visit your care team for regular checks on your progress. Tell your care team if your symptoms do not start to get better or if they get worse. Some products may contain alcohol. Ask your care team if this medication contains alcohol. Be sure to tell all care teams you are taking this medication. Certain medications, such as metronidazole and disulfiram, can cause an unpleasant reaction when taken with alcohol. The reaction includes flushing, headache, nausea, vomiting, sweating, and increased thirst. The reaction can last from 30 minutes to several hours. If you are being treated for a sexually transmitted infection (STI), avoid sexual contact until you have finished your treatment. Your partner may also need treatment. Estrogen and progestin hormones may not work as well while you are taking this medication. A barrier contraceptive, such as a condom or diaphragm, is recommended if you are using these hormones for contraception. Talk to your care team about effective forms of contraception.

What are the most serious risks of this medication?

This medicine was tested in animals. A risk for cancer was found in some animals but not in others. It is not clear if people have an increased risk for cancer with this medicine. This medicine will only be used when it is clearly needed for your condition.