Flagyl

DRUG DESCRIPTION

Flagyl (metronidazole) is an oral synthetic antiprotozoal and antibacterial agent, l-?-hydroxyethyl)-2-methyl-5-nitroimidazole, which has the following structural formula:

Flagyl® 
  (metronidazole) Structural Formula Illustration

Flagyl tablets contain 250 mg or 500 mg of metronidazole. Inactive ingredients include cellulose, FD&C Blue No. 2 Lake, hydroxypropyl cellulose, hypromellose, polyethylene glycol, stearic acid, and titanium dioxide.

What are the possible side effects of metronidazole (Flagyl, Flagyl 375, Flagyl ER)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have any of these serious side effects:

  • seizures (convulsions);
  • fever, chills, body aches, sore throat, flu symptoms;
  • numbness or tingling in your hands or feet;
  • white patches or sores inside your mouth or on your lips;
  • pain or burning when you urinate; or
  • ...

Read All Potential Side Effects and See Pictures of Flagyl »

What are the precautions when taking metronidazole (Flagyl)?

Before taking metronidazole, tell your doctor or pharmacist if you are allergic to it; or to other nitroimidazoles such as tinidazole; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: liver problems, nervous system disorders (e.g., seizures), blood disorders, Crohn's disease.

Avoid alcoholic beverages while taking this medication and for at least 1 day (3 days if you are taking the oral capsules) after finishing this medicine because drinking alcohol may result in severe stomach upset/cramps, nausea, vomiting, headache and flushing.

This drug...

Read All Potential Precautions of Flagyl »


Flagyl Consumer (continued)

SIDE EFFECTS: Dizziness, headache, diarrhea, nausea, stomach pain, loss of appetite, constipation, changes in taste, and dry mouth may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly.

This drug may cause urine to darken in color. This is harmless.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor immediately if any of these unlikely but serious side effects occur: unsteadiness, seizures, mental/mood changes (such as confusion), numbness/tingling of hands/feet, painful urination.

Tell your doctor immediately if any of these rare but very serious side effects occur: eye pain, severe/persistent headache, sudden vision changes, stiff/painful neck, sore throat, persistent fever, unusual bleeding/bruising, severe stomach pain, persistent nausea/vomiting.

Use of this medication for prolonged or repeated periods may result in oral thrush or a new vaginal yeast infection (oral or vaginal fungal infection). Contact your doctor if you notice white patches in your mouth, a change in vaginal discharge, or other new symptoms.

A very serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction may include: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

PRECAUTIONS: Before taking metronidazole, tell your doctor or pharmacist if you are allergic to it; or to other nitroimidazoles such as tinidazole; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: liver problems, nervous system disorders (e.g., seizures), blood disorders, Crohn's disease.

Avoid alcoholic beverages while taking this medication and for at least 1 day (3 days if you are taking the oral capsules) after finishing this medicine because drinking alcohol may result in severe stomach upset/cramps, nausea, vomiting, headache and flushing.

This drug may make you dizzy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely.

The elderly may be at greater risk for side effects while using this drug.

Tell your doctor if you are pregnant before using this drug. It should not be used during the first 3 months of pregnancy and used only with caution during the last 6 months, unless your infection has not improved on other antibiotics.

This medication passes into breast milk. Discuss the risks and benefits with your doctor before breast-feeding. If you are prescribed the single-dose treatment, your doctor may direct you to interrupt breast-feeding for a short time after the dose. Consult your doctor for more details.


Flagyl Patient Information Including Side Effects

Brand Names: Flagyl, Flagyl 375, Flagyl ER

Generic Name: metronidazole (Pronunciation: me troe NI da zole)

  • What is metronidazole (Flagyl)?
  • What are the possible side effects of metronidazole (Flagyl)?
  • What is the most important information I should know about metronidazole (Flagyl)?
  • What should I discuss with my healthcare provider before taking metronidazole (Flagyl)?
  • How should I take metronidazole (Flagyl)?
  • What happens if I miss a dose (Flagyl)?
  • What happens if I overdose (Flagyl)?
  • What should I avoid while taking metronidazole (Flagyl)?
  • What other drugs will affect metronidazole (Flagyl)?
  • Where can I get more information?

What is metronidazole (Flagyl)?

Metronidazole is an antibiotic. It fights bacteria in your body.

Metronidazole is used to treat bacterial infections of the vagina, stomach, skin, joints, and respiratory tract. This medication will not treat a vaginal yeast infection.

Metronidazole may also be used for other purposes not listed in this medication guide.

What are the possible side effects of metronidazole (Flagyl)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have any of these serious side effects:

  • seizures (convulsions);
  • fever, chills, body aches, sore throat, flu symptoms;
  • numbness or tingling in your hands or feet;
  • white patches or sores inside your mouth or on your lips;
  • pain or burning when you urinate; or
  • diarrhea that is watery or bloody.

Less serious side effects may include:

  • nausea, stomach pain, diarrhea;
  • headache, dizziness, loss of balance;
  • vaginal itching or discharge;
  • dry mouth or unpleasant metallic taste;
  • cough, sneezing, runny or stuffy nose; or
  • swollen or sore tongue.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.

What is the most important information I should know about metronidazole (Flagyl)?

Take this medication for the entire length of time prescribed by your doctor. Your symptoms may get better before the infection is completely treated. Metronidazole will not treat a viral infection such as the common cold or flu.

Do not drink alcohol while you are taking metronidazole and for at least 3 days after you stop taking it. You may have unpleasant side effects such as fast heartbeats, warmth or redness under your skin, tingly feeling, nausea, and vomiting.

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