Flagyl 400 Tablet

Reviewed By Dr. Rajeev Sharma, MBA, MBBS

Last updated on 14 Apr 2026 | 04:20 PM (IST)

Flagyl 400 Tablet is an antibiotic medicine that helps your body fight infections caused by bacteria and parasites. It is used to treat infections of the liver, stomach, intestines, vagina, brain, heart, lungs, bones, and skin. It may also help prevent an infection after surgery.

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₹22 MRP ₹24.3510% off

Available in pack-size of 20 tablets

20 tablets pack-size available

Flagyl 400 Tablet

₹29.4~~₹32.47~~

Available in pack size of 20 tablets

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Flagyl 400 Tablet

strip of 15 tablets

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~~₹24.35~~

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Flagyl 400 Tablet

strip of 20 tablets

Metronidazole (400mg)

by Abbott

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₹29.4

₹1.47 per tablet

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General Information

Contains

Metronidazole (400mg)

Marketer

Abbott

Storage

Store below 25°C

The content is shown in English

Product introduction

Flagyl 400 Tablet medicine is best taken after eating some food. It should be taken at the same time each day to maximize its benefits. Take the medicine exactly as prescribed by your doctor. Do not stop taking it until you have finished the full course of treatment, even if you feel better. If you stop taking it early, some bacteria may survive, and the infection may come back.

The most common side effects of this medicine are nausea, headache, and anorexia (loss of appetite). These are usually mild, but let your doctor know if they bother you or last more than a few days. You can try sugar-free candies or lozenges if you experience dry mouth or a metallic taste in your mouth.

Before using Flagyl 400 Tablet, inform your doctor if you are pregnant or breastfeeding, allergic to any medicine, have kidney or liver problems, or have a nervous system disease. Do not drink alcohol while taking this medicine and for a few days after stopping it, as you may experience unpleasant side effects such as nausea, vomiting, and stomach pain.

Uses of Flagyl Tablet

Treatment of Bacterial infections : These include infections caused by anaerobic bacteria, such as abdominal infections, pelvic infections (bacterial vaginosis), dental infections, skin infections, and lung infections.
Treatment of Parasitic infections

Benefits of Flagyl Tablet

Treatment of Bacterial infections
Flagyl 400 Tablet is used to treat a variety of bacterial infections, particularly those caused by anaerobic bacteria that thrive in environments with low oxygen levels. It works by inhibiting bacterial growth and killing the organisms that cause infection. This helps alleviate symptoms such as pain, fever, and inflammation, allowing the body to heal more quickly and reducing the risk of complications.

Treatment of Parasitic infections
Flagyl 400 Tablet kills the parasites responsible for these infections, helping relieve symptoms such as abdominal pain, diarrhea, and vaginal discomfort. Clearing the infection helps restore normal health, prevents recurrence, and improves overall well-being.

Side effects of Flagyl Tablet

Most side effects do not require any medical attention and disappear as your body adjusts to the medicine. Consult your doctor if they persist or if you’re worried about them

Common side effects of Flagyl

Headache
Dryness in mouth
Nausea
Metallic taste

How to use Flagyl Tablet

Take this medicine in the dose and duration as advised by your doctor. Swallow it as a whole. Do not chew, crush or break it. Flagyl 400 Tablet should be taken with or after food.

How Flagyl Tablet works

Flagyl 400 Tablet contains metronidazole, an antibiotic and antiprotozoal medicine that works by entering the bacterial or parasitic cells and damaging their DNA. This prevents the microorganisms from growing and reproducing, ultimately leading to their death and clearing the infection.

All substitutes for Flagyl 400 Tablet

For information purposes only. Consult a doctor before taking any medicine.

Quick tips

Take Flagyl 400 Tablet with a full meal or a glass of milk to reduce the risk of gastrointestinal side effects.
Do not drink alcohol during or for 2-3 days after treatment with this medicine. You may develop nausea, vomiting, flushing, and headache (disulfiram-like reaction).
Your urine may appear darker or reddish-brown during treatment. This is a known, harmless effect of Flagyl 400 Tablet and does not indicate kidney damage or bleeding.
A temporary metallic or bitter taste in the mouth may occur during therapy. This is a common side effect and usually resolves after completing the treatment.
Inform your doctor if you have liver disease. Your dose may need to be adjusted in severe liver disease.

Safety advice

Alcohol

UNSAFE

Consumption of alcohol with Flagyl 400 Tablet may cause a disulfiram-like reaction, leading to symptoms such as flushing, increased heart rate, low blood pressure, nausea, lightheadedness, and severe headache.

Pregnancy

CONSULT YOUR DOCTOR

The safety of Flagyl 400 Tablet during pregnancy has not been established. There are no adequate and well-controlled studies in pregnant women, and animal data on reproductive toxicity are insufficient. Your doctor will weigh the benefits and any potential risks before prescribing.
Flagyl 400 Tablet should be used during pregnancy only after consulting the doctor.

Breast feeding

CONSULT YOUR DOCTOR

Flagyl 400 Tablet may be unsafe to use during breastfeeding. Limited human data suggests that the drug may pass into the breastmilk and harm the baby. It should be used only if the expected benefit outweighs the potential risk. Please consult your doctor.
If a single dose of Flagyl 400 Tablet is used, it is recommended to hold breastfeeding for 12-24 hours to allow the removal of the drug.

Driving

UNSAFE

Flagyl 400 Tablet may decrease alertness, affect your vision, or make you feel sleepy and dizzy. Do not drive if these symptoms occur.
Flagyl 400 Tablet may make you feel sleepy, dizzy, confused. You may have hallucinations, fits (convulsions) or temporary eyesight problems (such as blurred or double vision) affecting your ability to drive.

Kidney

SAFE IF PRESCRIBED

Flagyl 400 Tablet is safe to use in patients with kidney disease. No dose adjustment is recommended.
Patients undergoing kidney dialysis should take this medicine after the dialysis treatment.

Liver

CAUTION

Flagyl 400 Tablet should be used with caution in patients with liver disease. Dose adjustment may be needed.

Interaction with drugs

Taking Flagyl with any of the following medicines can modify the effect of either of them and cause some undesirable side effects

Moderate

Disulfiram (Oral Route)

Do not consume Metronidazole with Disulfiram. If concurrent use is essential, watch out for symptoms such as constipation, confusion or psychosis and consult your doctor if you experience them. They may monitor your treatment and adjust the doses as per the observations. Disulfiram may reduce blood levels of active form of Metronidazole.

Moderate

Phenobarbitone (Oral Route)

If concurrent use is essential, your doctor may monitor your treatment and adjust the doses as per the observations. Phenobarbitone may increase the metabolism of Metronidazole.

Moderate

Phenobarbitone (Injection Route)

If concurrent use is essential, your doctor may monitor your treatment and adjust the doses as per the observations. Phenobarbitone may increase the metabolism of Metronidazole.

Moderate

Primidone (Oral Route)

If concurrent use is essential, your doctor may monitor your treatment and adjust the doses as per the observations. Primidone may increase the metabolism of Metronidazole.

Moderate

Lithium carbonate (Oral Route)

Do not consume Lithium carbonate with Metronidazole. If concurrent use is essential, your doctor may monitor your blood Lithium carbonate levels, creatinine levels, electrolytes or overall treatment and adjust the doses as per the observations. Lithium carbonate may raise blood levels of the active form of Metronidazole.

Frequently asked questions

What is Flagyl 400 Tablet and what is it used for?

Flagyl 400 Tablet is an antibiotic used to treat infections caused by certain bacteria and parasites. It is commonly prescribed for infections of the stomach and intestines (such as amoebiasis and giardiasis), vaginal infections like trichomoniasis and bacterial vaginosis, dental and gum infections, and other infections caused by bacteria that grow without oxygen. It works by killing the germs responsible for the infection.

Is Flagyl 400 Tablet safe for patients with liver conditions?

The liver processes Flagyl 400 Tablet, so people with liver problems need to take it carefully. In patients with severe liver disease, the medicine may stay in the body longer, which can increase the risk of side effects. In such cases, your doctor may reduce the dose and monitor you more closely. Anyone with liver disease should inform their doctor before starting treatment.

Can Flagyl 400 Tablet lead to antibiotic resistance?

Yes, like all antibiotics, Flagyl 400 Tablet can contribute to antibiotic resistance if used improperly. Taking it when it is not needed, using it for the wrong condition, or not completing the full prescribed course can allow bacteria to survive and become harder to treat in the future. It should always be taken after consulting your doctor.

How should Flagyl 400 Tablet be consumed relative to meals?

Flagyl 400 Tablet can be taken with or after food. Taking it with food may help reduce stomach upset or nausea. The tablets should be swallowed with water, and you should follow your doctor’s instructions regarding the dose and duration of treatment.

How long does Flagyl 400 Tablet take to work?

Flagyl 400 Tablet usually begins working within about one hour after you take it, as the medicine is absorbed into the bloodstream. However, you may not feel better immediately. In most infections, noticeable improvement in symptoms may take 2–3 days. It is important to continue taking the medicine as prescribed. If your symptoms do not improve or worsen, you should consult your doctor.

Can I drink alcohol while using Flagyl 400 Tablet?

No, you should avoid alcohol while taking Flagyl 400 Tablet and for at least 3 days after completing the course. Drinking alcohol during this time can cause an unpleasant reaction known as a “disulfiram-like reaction.” Symptoms may include stomach cramps, nausea, vomiting, headache, flushing (redness of the face), and a feeling of discomfort.

Can using Flagyl 400 Tablet cause a metallic taste?

Yes, a temporary metallic taste in the mouth is a known side effect. This is usually harmless and resolves after treatment is completed. Staying well hydrated, brushing your teeth after meals, and chewing sugar-free gum or mints may help reduce this sensation.

Can I stop taking Flagyl 400 Tablet when I feel better?

No, you should complete the full prescribed course, even if you start feeling better. Symptoms may improve before the infection is fully cleared. Stopping the medicine too early can cause the infection to return and may make it harder to treat. Always consult your doctor before stopping the medicine.

What if there is no improvement after using Flagyl 400 Tablet?

If you do not feel better after completing the full course, or if your symptoms worsen during treatment, inform your doctor. Further evaluation or a change in treatment may be needed.

Fact Box

Chemical Class

Nitroimidazole derivative

Habit Forming

Therapeutic Class

GASTRO INTESTINAL

Action Class

Antiprotozoal & Antibacterial- Nitroimidazoles

Related lab tests

Complete Blood Count

Peripheral Smear Examination

References

Phillips MA, Stanley SL Jr. Chemotherapy of Protozoal Infections: Amebiasis, Giardiasis, Trichomoniasis, Trypanosomiasis, Leishmaniasis, and Other Protozoal Infections. In: Brunton LL, Chabner BA, Knollmann BC, editors. Goodman & Gilman’s: The Pharmacological Basis of Therapeutics. 12th ed. New York, New York: McGraw-Hill Medical; 2011. pp. 1428-30.
Chambers HF, Deck DH. Miscellaneous Antimicrobial Agents; Disingectants, Antiseptics, & Sterilants. In: Katzung BG, Masters SB, Trevor AJ, editors. Basic and Clinical Pharmacology. 11th ed. New Delhi, India: Tata McGraw Hill Education Private Limited; 2009. p. 877.
Rosenthal PJ. Antiprotozoal Drugs. In: Katzung BG, Masters SB, Trevor AJ, editors. Basic and Clinical Pharmacology. 11th ed. New Delhi, India: Tata McGraw Hill Education Private Limited; 2009. pp. 912-14.
Briggs GG, Freeman RK, editors. A Reference Guide to Fetal and Neonatal Risk: Drugs in Pregnancy and Lactation. 10th ed. Philadelphia, PA: Wolters Kluwer Health; 2015. pp. 905-910.
Metronidazole. New York, New York: Pfizer; 2013. [Accessed 29 Mar. 2019] (online) Available from:
Chaves RG, Lamounier JA. Breastfeeding and maternal medications. J Pediatr (Rio J). 2004;80(5 Suppl):S189-98. [Accessed 29 Mar. 2019] (online) Available from:

User feedback

Patients taking Flagyl 400 Tablet

Twice A Day

100%

What are you using Flagyl Tablet for?

Bacterial infections

78%

Others

19%

Diarrhea

How much was the improvement?

Average

46%

Excellent

29%

Poor

25%

What were the side-effects while using Flagyl 400 Tablet?

No Side Effect

39%

Dryness in mouth

21%

Headache

15%

Nausea

Joint pain

How do you take Flagyl Tablet?

With food

84%

With or without food

12%

Empty stomach

Please rate Flagyl 400 Tablet on price

Not Expensive

46%

Average

43%

Expensive

11%

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Disclaimer

Tata 1mg's sole intention is to ensure that its consumers get information that is expert-reviewed, accurate and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover everything about particular health conditions, lab tests, medicines, all possible side effects, drug interactions, warnings, alerts, etc. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.

Marketer details

Name: Abbott
Address: 16th Floor, Godrej BKC, Plot – C, “G” Block, Bandra-Kurla Complex, Bandra (East), Mumbai – 400 051, India

Vendor Details

Country of origin: India

Lab tests offered by us

Why we need a prescription?

Flagyl 400 Tablet

Save more with additional offers

General Information

Contains

Marketer

Storage

Product introduction

Uses of Flagyl Tablet

Benefits of Flagyl Tablet

Side effects of Flagyl Tablet

How to use Flagyl Tablet

How Flagyl Tablet works

All substitutes for Flagyl 400 Tablet

MEtron 400mg Tablet

Aristogyl 400 Tablet

MEtrogyl 400 Tablet

Quick tips

Safety advice

Alcohol

Pregnancy

Breast feeding

Driving

Kidney

Liver

Interaction with drugs

Disulfiram (Oral Route)

Phenobarbitone (Oral Route)

Phenobarbitone (Injection Route)

Primidone (Oral Route)

Lithium carbonate (Oral Route)

Frequently asked questions

What is Flagyl 400 Tablet and what is it used for?

Is Flagyl 400 Tablet safe for patients with liver conditions?

Can Flagyl 400 Tablet lead to antibiotic resistance?

How should Flagyl 400 Tablet be consumed relative to meals?

How long does Flagyl 400 Tablet take to work?

Can I drink alcohol while using Flagyl 400 Tablet?

Can using Flagyl 400 Tablet cause a metallic taste?

Can I stop taking Flagyl 400 Tablet when I feel better?

What if there is no improvement after using Flagyl 400 Tablet?

Fact Box

Chemical Class

Habit Forming

Therapeutic Class

Action Class

Related lab tests

Complete Blood Count

Peripheral Smear Examination

References

User feedback

Patients taking Flagyl 400 Tablet

What are you using Flagyl Tablet for?

How much was the improvement?

What were the side-effects while using Flagyl 400 Tablet?

How do you take Flagyl Tablet?

Please rate Flagyl 400 Tablet on price

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Have issue with the content

Disclaimer

Marketer details

Vendor Details

Lab tests offered by us

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