Flagyl 400mg

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Flagyl 400mg

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Description

SKU	678
Generic For	Flagyl
Strength	400mg
Manufacturer	J.B. Chemichals Pvt. Ltd., India
Active Ingredient	Metronidazole

Product Description

Flagyl 400mg for Bacterial Infections — Order Online

Name: Flagyl 400mg
Brand: Flagyl
SKU: 678
Availability: InStock
Rating: 5 (6 reviews)

Flagyl 400mg is a widely recognised and globally trusted antibiotic and antiprotozoal medication containing 400mg of metronidazole per tablet. It is indicated for the treatment of a broad spectrum of bacterial and protozoal infections and is one of the most prescribed antimicrobial agents in both community and hospital settings worldwide. Flagyl is manufactured by Abbott India Ltd and is distinguished by its well-established clinical efficacy, extensive safety record, and broad utility across multiple infection types, including anaerobic bacterial infections, gastrointestinal protozoan infestations, gynaecological infections, and dental abscesses.

What is Flagyl 400mg?

Flagyl 400mg is a prescription antiamoebic tablet containing metronidazole 400mg, classified as a 5-nitroimidazole antimicrobial agent. It is active against a wide range of anaerobic bacteria and protozoa, including Trichomonas vaginalis, Entamoeba histolytica, Giardia lamblia, Bacteroides species, Clostridium species, and Helicobacter pylori (in combination regimens). Metronidazole is bactericidal and antiprotozoal — it does not merely inhibit growth but actively kills susceptible organisms. It is used in both acute and chronic infection settings, including gastrointestinal, gynaecological, dental, skin, bone, joint, and respiratory infections caused by anaerobic or protozoal pathogens. Flagyl is also a component of standard H. pylori eradication regimens for peptic ulcer disease. The 400mg tablet is among the most commonly prescribed strengths in adult dosing.

Manufacturer: Flagyl 400mg is manufactured by Abbott India Ltd, the Indian subsidiary of Abbott Laboratories — a globally respected pharmaceutical company with decades of expertise in antimicrobial and specialty medicines.

The Active Ingredient, Metronidazole, and Its Working Mechanism

Metronidazole is a nitroimidazole compound that exerts its antimicrobial and antiprotozoal effects through a unique, targeted mechanism. Once absorbed into susceptible anaerobic organisms or protozoa, metronidazole undergoes intracellular reductive activation by electron transport proteins specific to anaerobic metabolism — particularly ferredoxin and flavodoxin. This reduction generates cytotoxic nitro radical anion intermediates that cause irreversible strand breaks in the organism’s DNA, disrupting its structural integrity and inhibiting DNA synthesis and repair. Because this activation depends on the anaerobic electron transport chain absent in aerobic mammalian cells, metronidazole exhibits highly selective toxicity against anaerobes and microaerophiles without significant activity against aerobic organisms or harm to host tissues at therapeutic concentrations. This mechanism also underlies its consistent efficacy regardless of antibiotic resistance patterns affecting beta-lactams, macrolides, and other drug classes.

Clinical Uses of Metronidazole Tablets

Flagyl 400mg is indicated for the treatment of anaerobic bacterial infections at multiple sites including intra-abdominal sepsis, peritonitis, liver abscess, gynaecological infections (bacterial vaginosis, pelvic inflammatory disease), dental infections (dental abscess, acute ulcerative gingivitis), skin and soft tissue infections, bone and joint infections, meningitis and brain abscess caused by anaerobic bacteria, and lower respiratory tract infections. Protozoal indications include amoebic dysentery and hepatic amoebiasis (Entamoeba histolytica), giardiasis (Giardia lamblia), and trichomoniasis (Trichomonas vaginalis). Flagyl is also used perioperatively for surgical prophylaxis against anaerobic contamination. In Helicobacter pylori eradication protocols, metronidazole is used in combination with a proton pump inhibitor and a second antibiotic (typically clarithromycin or amoxicillin). Flagyl is not effective against aerobic organisms, viruses, or fungi.

Related Strengths and Products

Related products with the same active ingredient include Metrogyl 200. Others in the form of topical formulations include Metrogyl 30gm and Roza gel 30gm. These medicines are commonly prescribed for bacterial, parasitic, dental, intestinal, and vaginal infections. Doctors may adjust the strength based on the severity of the infection and the duration of treatment.

Key Benefits of Flagyl 400mg

Flagyl 400mg offers potent, bactericidal, and antiprotozoal activity through a mechanism distinct from all other major antibiotic classes, making it effective even against organisms resistant to beta-lactam and macrolide antibiotics. Its broad anaerobic and protozoal spectrum allows it to be used across a wide range of infections. Metronidazole is well absorbed orally, achieving high tissue concentrations in the brain, liver, bone, and genital tract — areas where many antibiotics have poor penetration. The 400mg tablet is a practical, well-tolerated dose for most adult indications, and the 15-tablet pack is typically sufficient to complete full antibiotic courses for standard infections.

How To Use

Dosage Advice and Storage

The dose of Flagyl 400mg depends on the type and severity of the infection and must be prescribed by a qualified healthcare professional. For bacterial infections, a common adult regimen is 400mg three times daily for 5 to 7 days. For trichomoniasis, a single 2g dose (five tablets) may be prescribed. For amoebic dysentery, typical dosing is 400–800mg three times daily for 5 to 10 days. Tablets should be swallowed whole with water and may be taken with food to minimise gastrointestinal side effects. Alcohol must be strictly avoided during metronidazole treatment and for at least 48 hours after the last dose — the combination causes a severe disulfiram-like reaction (flushing, vomiting, palpitations, and hypotension). Complete the full prescribed course even if symptoms improve early — premature discontinuation risks treatment failure and promotes resistance. Store below 25°C in a dry place, protected from light and moisture.

Precautions

Warnings and Drug Interactions Related to Metronidazole

The most critical interaction with metronidazole is with alcohol and alcohol-containing products — this combination causes a disulfiram-like reaction and is absolutely contraindicated. Metronidazole also significantly potentiates warfarin’s anticoagulant effect by inhibiting its hepatic metabolism — patients on warfarin must have INR monitored closely and dosage adjusted. Lithium toxicity can occur due to reduced renal clearance. Phenytoin levels may rise when co-administered with metronidazole; conversely, phenobarbitone can reduce metronidazole effectiveness. Metronidazole should be used with caution in patients with severe hepatic impairment (dose reduction required), blood dyscrasias, or a history of neurological disorders, as high doses or prolonged use can cause peripheral neuropathy and central nervous system effects. It crosses the placenta freely — use in the first trimester of pregnancy is generally avoided unless the benefit clearly outweighs the risk. Metronidazole is secreted in breast milk and is generally avoided during breastfeeding.

Side Effects

Side Effects Associated with Metronidazole Tablets

The most commonly reported side effects of Flagyl 400mg include nausea, metallic taste in the mouth, loss of appetite, abdominal cramping, and diarrhoea. These gastrointestinal effects are dose-related and can be minimised by taking the medication with food. Headache and dizziness are occasionally reported. A dark or reddish-brown discolouration of urine is a harmless and well-known side effect due to metronidazole metabolite excretion. With prolonged high-dose use, peripheral neuropathy (numbness or tingling in hands and feet) and central nervous system effects, including confusion and seizures, may occur — these are rare at standard doses. Leucopenia (low white blood cell count) is rare but requires monitoring with extended courses. Allergic reactions, including rash, urticaria, and angioedema, have been reported.

Where to Buy Authentic Flagyl 400mg Online?

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FAQ

What is Flagyl 400mg used for?

Flagyl 400mg contains metronidazole, an antibiotic that treats infections caused by bacteria and parasites. Your doctor may prescribe it for bacterial infections in your stomach, intestines, or reproductive organs, or for parasitic infections like giardia. It's also used to treat certain dental infections and to prevent infections after surgery. Flagyl works by damaging the DNA of harmful microorganisms, stopping them from multiplying. Always take it exactly as prescribed, even if you feel better before finishing the course.

Who is Flagyl 400mg meant for, and is it right for me?

Flagyl 400mg is an antibiotic tablet used to treat infections caused by bacteria and parasites, particularly in the digestive system, reproductive organs, and skin. Your doctor prescribes it based on the specific infection you have. It's not suitable for everyone — your doctor considers your age, other medicines you take, liver or kidney problems, and pregnancy status before prescribing. Only your doctor can decide if Flagyl is right for you. Do not take it without a prescription, and tell your doctor about any existing health conditions or allergies.

What should I do if I forget to take a dose of Flagyl 400mg?

If you forget to take a dose of Flagyl 400mg, take it as soon as you remember. However, if it's almost time for your next dose, skip the missed dose and continue with your regular schedule. Never take a double dose to make up for a missed one. If you're unsure about what to do, contact your doctor or pharmacist for guidance. Keeping to a consistent routine helps you remember to take your doses on time.

Can I stop using Flagyl 400mg once I start feeling better?

No, you should not stop taking Flagyl 400mg when you feel better. You must complete the full course of treatment prescribed by your doctor, even if your symptoms improve. Stopping early allows the infection to return and can help harmful bacteria become resistant to the medicine, making future infections harder to treat. Always finish all your tablets as directed unless your doctor tells you to stop. If you experience side effects or have concerns, contact your doctor for guidance rather than stopping on your own.

How quickly will I notice Flagyl 400mg working?

Flagyl 400mg usually begins working within 24–48 hours of starting treatment. You may notice your symptoms improving during this time, though it varies depending on what infection you're treating. Complete symptom relief typically takes 7–10 days of regular use as prescribed. Continue taking your tablets for the full course even if you feel better, as stopping early can allow the infection to return. Always follow your doctor's instructions.

How will I know if Flagyl 400mg is working for me?

You'll know Flagyl is working when your infection symptoms improve. For bacterial or parasitic infections, look for reduced discharge, less odor, or decreased pain within a few days. For fungal infections like thrush, white patches should fade and itching should ease. Digestive symptoms like bloating or cramping typically improve within 3–5 days. If you see no improvement after one week, or symptoms worsen, contact your doctor—your infection may need different treatment.

What are the common side effects of Flagyl 400mg, and should I be worried?

Most people tolerate Flagyl 400mg well, but some experience mild side effects. Common ones include a metallic taste in your mouth, nausea, headache, and stomach upset. These usually fade as your body adjusts. Diarrhea or constipation may occur. If side effects persist or worsen, contact your doctor. Serious side effects are rare but include severe allergic reactions, numbness in your hands or feet, or dark urine—seek medical help immediately if these happen. Never stop taking Flagyl without consulting your doctor, as finishing your full course is important for treating your infection properly.

Can Flagyl 400mg cause an allergic reaction, and what should I look for?

Yes, Flagyl 400mg can cause allergic reactions in some people. Watch for signs like rash, itching, swelling of your face or throat, difficulty breathing, or dizziness. These symptoms need immediate medical attention. Less common signs include hives or joint pain. If you've had allergic reactions to metronidazole (the active ingredient) or similar medicines before, tell your doctor. Stop taking Flagyl and seek emergency help if you experience severe symptoms like throat swelling or breathing problems.

Is it safe to drink alcohol while taking Flagyl 400mg?

No, you should not drink alcohol while taking Flagyl 400mg. Metronidazole (the active ingredient) can cause a serious reaction called disulfiram-like reaction when combined with alcohol. This may cause nausea, vomiting, flushing, headache, and abdominal pain. Avoid all alcoholic drinks, including beer, wine, and spirits, during your treatment and for at least 48 hours after your last dose. If you have concerns about alcohol and your treatment, speak with your doctor or pharmacist.

Are there any foods or drinks I should avoid while on Flagyl 400mg?

You should avoid alcohol completely while taking Flagyl 400mg and for at least 48 hours after your last dose. Mixing alcohol with this medicine can cause severe nausea, vomiting, flushing, and headache. There are no specific foods you must avoid, but eating a light meal or snack with your tablet may help reduce stomach upset. If you experience persistent nausea or stomach discomfort, contact your doctor.

Are there any groups of people who should be extra careful when using Flagyl 400mg?

Certain people need extra care with Flagyl 400mg. You should tell your doctor before using it if you have liver disease, nervous system problems, or blood disorders. Pregnant women, especially in the first three months, should avoid it unless absolutely necessary. If you're breastfeeding, ask your doctor—metronidazole (the active ingredient) passes into breast milk. People with a history of allergic reactions to metronidazole or similar medicines need to be cautious. Also mention any current medicines to your doctor, as some can interact with Flagyl. Always discuss your medical history before starting treatment.

Can older adults or children use Flagyl 400mg safely?

Flagyl 400mg is not recommended for young children without a doctor's specific approval, as they typically need lower doses based on their weight. Older adults can usually use Flagyl 400mg safely, but your doctor may adjust your dose if you have liver or kidney problems, which are more common with age. Always tell your doctor about any other medicines you take, as Flagyl can interact with some drugs. Your doctor will decide the right dose for you based on your age, health, and the infection being treated.

How does Flagyl 400mg compare to other treatments used for the same condition?

Flagyl 400mg contains metronidazole, which works by destroying bacteria and parasites [tiny organisms causing infection]. It's often used for bacterial infections and certain parasitic conditions. Other treatments may include different antibiotics like amoxicillin or clindamycin, which work differently in your body. Your doctor chooses the best option based on the specific infection type, your medical history, and any allergies. Some conditions respond better to metronidazole; others need alternative medicines. Effectiveness and side effects vary between treatments, so what works best for you depends on your individual situation.

What are my options if Flagyl 400mg does not agree with me?

If Flagyl 400mg does not agree with you, speak to your doctor before stopping the medicine. Your doctor can discuss several options: adjusting your dose, taking it with food to reduce stomach upset, or switching you to an alternative antibiotic [medicine that kills bacteria or parasites] that works similarly but may suit you better. Do not stop taking Flagyl without medical advice, as this could affect your treatment. Your doctor will help find the best solution for your situation.

Is it safe to buy Flagyl 400mg online, and how do I know it is genuine?

Buying Flagyl 400mg online is safe when you use a licensed pharmacy like ReliableRxPharmacy.com. We source all medicines from authorised distributors of manufacturers, ensuring genuine products. Choose an pharmacy that requires a valid prescription, provides transparent customer service, and features authentic customer testimonials. Genuine Flagyl tablets come in original packaging with clear labelling, batch numbers, and expiry dates. Avoid suspiciously cheap offers or sites that don't require prescriptions—these are red flags for counterfeit medicines. Always keep your receipt and packaging as proof of purchase.

How do I safely dispose of leftover or out-of-date Flagyl 400mg?

Do not throw Flagyl 400mg tablets into household waste or flush them down the toilet, as this harms the environment. Instead, take unused or out-of-date tablets to a pharmacy or medicine disposal service in your area — most pharmacies accept old medicines for free. If no local service exists, ask your pharmacist for guidance on safe home disposal methods. Keep tablets in their original container until disposal.

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