Available Dosages
| SKU: | 678 |
|---|---|
| Active Ingredient: | Metronidazole |
| Manufacturer: | Abbott Healthcare, India |
Buy Flagyl 400mg (Metronidazole) Antibiotic for Infections
Flagyl 400mg is a widely prescribed antibiotic and antiprotozoal medication used to combat a broad spectrum of bacterial and parasitic infections. It contains Metronidazole as its active ingredient. Flagyl has been an essential medicine on the WHO Model List of Essential Medicines for decades. It is recognised globally for its efficacy and safety in treating infections of the reproductive tract, gastrointestinal system, skin, joints, and respiratory tract.
What is Flagyl 400mg?
Flagyl 400mg is an oral antibiotic tablet containing 400mg of Metronidazole. It belongs to the nitroimidazole class of antibiotics and exerts potent action against a wide range of anaerobic bacteria and protozoan parasites. It is a prescription medication used to treat infections that ordinary antibiotics cannot adequately address, particularly those caused by anaerobic organisms that thrive in low-oxygen environments. Flagyl is not effective against viral infections such as the common cold or influenza, nor is it suitable for treating vaginal yeast infections. For more information about the importance of antibiotics, talk to your healthcare professional.
Manufacturer information: Flagyl 400mg is manufactured and marketed by Abbott India Ltd. Abbott is a globally recognised pharmaceutical company known for producing quality healthcare and prescription medicines.
The mode of action of Metronidazole (active ingredient)
The active ingredient in Flagyl 400mg is Metronidazole. Once absorbed, Metronidazole is taken up by anaerobic bacterial and protozoal cells. Inside these microorganisms, it is chemically activated, disrupting the helical structure of DNA and thereby inhibiting nucleic acid synthesis and causing cell death. This mechanism is highly selective for anaerobic organisms because they lack the antioxidant defences that aerobic human cells possess, making Metronidazole an effective and targeted antibiotic. It is bactericidal (kills bacteria) rather than merely bacteriostatic (inhibiting growth).
Clinical uses of Metronidazole
Flagyl 400mg is used to treat a wide range of infections. These include bacterial vaginosis, trichomoniasis (a sexually transmitted infection), Helicobacter pylori-associated peptic ulcers (often in combination with other antibiotics and a proton pump inhibitor), amoebiasis (intestinal infection caused by Entamoeba histolytica), giardiasis (intestinal infection caused by Giardia lamblia), anaerobic soft tissue infections, intra-abdominal infections, liver abscess, and dental infections. It is also used as a prophylactic antibiotic before certain surgical procedures.
Related strengths & products: Metrogyl 200mg for milder infections, standard treatment. Other topical metronidazole combinations include Roza gel 30mg.
Key benefits of Flagyle 400mg
Flagyl 400mg offers broad-spectrum coverage against anaerobic bacteria and many protozoa, making it one of the most versatile antibiotics available. It is highly bioavailable when taken orally, achieving rapid, effective tissue concentrations. The medication has a well-established safety profile developed over many decades of clinical use worldwide. It is available in an affordable generic form, providing cost-effective treatment. Its efficacy against H. pylori makes it a cornerstone of triple therapy for peptic ulcer disease, and its antiprotozoal action makes it uniquely suited for infections such as amoebiasis and giardiasis that other antibiotics cannot treat.
Precautions and risk information associated with Metronidazole
Flagyl is contraindicated in patients with a history of allergy to Metronidazole or other nitroimidazoles. It should not be taken during the first trimester of pregnancy due to potential risks to foetal development. Women who are breastfeeding should inform their doctor, as Metronidazole passes into breast milk. Patients with a history of liver disease, neurological conditions, blood disorders such as anaemia or leukopenia, epilepsy, or Crohn's disease should inform their doctor before use, as special monitoring or dose adjustments may be needed. Metronidazole interacts significantly with alcohol, causing a severe disulfiram-like reaction; alcohol must be avoided throughout the course and for 72 hours after completion. It may also interact with warfarin (potentiating its anticoagulant effect), lithium, phenytoin, and busulfan. Antibiotic-associated diarrhoea, which may signal a Clostridioides difficile infection, should be reported to a doctor promptly. Do not self-medicate with antidiarrhoeal drugs unless specifically advised by your physician.
Side effects associated with Metronidazole
Many patients tolerate Flagyl 400mg without significant side effects. However, some patients may experience gastrointestinal symptoms such as nausea, vomiting, stomach cramps, diarrhoea, loss of appetite, and a bitter or metallic taste in the mouth. These are among the most frequently reported complaints, but are often manageable by taking the medication with food. Neurological side effects, though less common, can occur and include headache, dizziness, and tingling or numbness in the extremities — a sign of peripheral neuropathy that warrants prompt medical attention. Serious but rare effects include seizures, encephalopathy, confusion, and mood changes. Dark or reddish-brown urine discolouration is a recognised harmless effect of metronidazole metabolism. Severe skin reactions, including Stevens-Johnson syndrome, are extremely rare. Any signs of an allergic reaction — hives, breathing difficulty, or facial swelling — require immediate emergency care.
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Purchasing Flagyl 400mg online through AllDayChemist provides significant convenience and financial savings. Prices are considerably lower than those for branded or retail alternatives in many countries. The platform offers genuine Flagyl, ensuring quality and consistency. Ordering online is discreet and practical, particularly for conditions involving the reproductive or gastrointestinal tract. Home delivery eliminates the need to visit a pharmacy while unwell. AllDayChemist supports secure prescription uploads, ensuring a safe, compliant dispensing process. For patients who have received a repeat prescription, online purchasing simplifies maintaining uninterrupted treatment.
Dosing information and administration protocol for using Metronidazole
Flagyl 400mg should be taken exactly as prescribed by your doctor. Do not alter the dose or duration without medical advice. The tablet is typically taken on an empty stomach, at least one hour before or two hours after eating, though it may be taken with food if it causes stomach upset. Swallow the tablet whole; do not crush, chew, or break it, as this could lead to a higher-than-intended amount of the drug being released at once.
The dosage and duration of antibiotic tablets vary depending on the type of infection being treated. Common regimens include 400mg two to three times daily for 5 to 10 days for most bacterial and protozoal infections. Always complete the full course of treatment, even if you start feeling better early, as stopping prematurely can lead to drug-resistant infections that are harder to treat.
Do not consume alcohol during metronidazole treatment or for at least 72 hours after the course ends, as this combination can cause a severe disulfiram-like reaction characterised by nausea, vomiting, flushing, and palpitations. Store at room temperature (15–30°C), away from light and moisture.
What is Metronidazole and what is it used for?
Metronidazole is an antibiotic that fights bacteria and parasites in your body. Flagyl 400mg treats several types of infections including those in your stomach, intestines, skin, joints, and reproductive organs. It's commonly prescribed for bacterial vaginosis, trichomoniasis (a sexually transmitted infection), certain gut infections like giardiasis, and dental abscesses. It also helps treat infections caused by anaerobic bacteria, which are germs that grow in areas without oxygen. Your doctor might also prescribe it alongside other medicines to treat stomach ulcers caused by a bacteria called H. pylori.
How does Metronidazole actually work in the body?
Metronidazole works by entering harmful bacteria and parasites and damaging their DNA, which is like their instruction manual for survival. Once the DNA is broken, these germs can't make new copies of themselves or repair damage, so they die off. Think of it like cutting the power to a factory so it can't produce anything anymore. This antibiotic is particularly good at killing organisms that don't need oxygen to survive, which is why it works well for infections deep inside your body where oxygen levels are low, like in your gut or around tooth roots.
How long does Flagyl 400mg take to start working?
Most people start feeling better within two to three days of taking Flagyl 400mg, though the medicine begins working in your body within a few hours of your first dose. For some infections like bacterial vaginosis or gut parasites, you might notice symptom relief sooner, while skin or dental infections may take a bit longer. It's really important to finish the entire course your doctor prescribed, even if you feel completely better after just a few days. Stopping early can allow the infection to come back stronger and make it harder to treat next time.
When and how should I take Flagyl 400mg?
Take Flagyl 400mg with food or right after a meal to prevent stomach upset. Swallow the tablet whole with a full glass of water. Most people take it two or three times daily, spaced evenly throughout the day, but follow your doctor's specific instructions. Try taking it at the same times each day to help you remember. Avoid alcohol completely while taking this antibiotic and for at least 48 hours after your last dose, as mixing them causes severe nausea, vomiting, and stomach cramps. If you're unsure about your dosing schedule, check with your doctor or pharmacist.
What should I do if I forget to take a dose of Flagyl 400mg?
Take the missed dose as soon as you remember, unless it's almost time for your next scheduled dose. If your next dose is coming up in an hour or two, skip the missed one and just continue with your regular schedule. Never take two doses at once to make up for a forgotten tablet, as this increases your risk of side effects. To avoid missing doses in the future, try setting phone reminders or taking your tablets at the same time as another daily habit like brushing your teeth or eating breakfast.
Is it safe to take Flagyl 400mg for a long time?
Flagyl 400mg is typically prescribed for short courses lasting five to ten days, and it's not meant for long-term use in most cases. Extended use can increase the risk of side effects like nerve damage that causes tingling or numbness in your hands and feet, or changes in your blood counts. Some people with certain chronic conditions might need longer treatment, but this requires careful monitoring by a doctor with regular check-ups. Always follow your prescribed treatment length exactly and don't extend it on your own, even if symptoms linger.
Can I take Flagyl 400mg with other medicines I am already on?
Flagyl 400mg can interact with several common medicines, so it's important to tell your doctor about everything you're taking. It can increase the effects of blood thinners like warfarin, potentially causing bleeding problems. It may also interact with lithium (for mood disorders), certain seizure medicines, and a medicine called disulfiram used for alcohol dependence. Even over-the-counter products and herbal supplements can interact. Make a complete list of your current medicines, vitamins, and supplements before starting treatment. Your doctor can adjust doses or timing to keep you safe.
How is Flagyl 400mg different from similar medicines used for the same condition?
Flagyl 400mg containing metronidazole is specifically effective against anaerobic bacteria and parasites, which makes it different from regular antibiotics like amoxicillin or azithromycin that target different types of germs. For bacterial vaginosis, metronidazole is often the first choice because it works better than many alternatives. For gut parasites like giardia, it's one of the most reliable options available. Unlike broad-spectrum antibiotics that kill many types of bacteria including good ones, metronidazole is more targeted. This means it might cause less disruption to your healthy gut bacteria, though you should still consider taking probiotics.
Is the generic version containing Metronidazole just as good as the branded medicine?
Yes, generic metronidazole is just as effective as brand-name versions like Flagyl. All approved generic versions must contain the same active ingredient at the same strength and meet strict quality standards set by medicine regulators. They work the same way in your body and produce the same results. The main differences are usually the inactive ingredients like fillers or coatings, and the price, with generics typically costing much less. Doctors and pharmacists prescribe and dispense generic metronidazole routinely because it offers the same treatment benefits at better value for patients.
What side effects can Metronidazole cause?
Common side effects of metronidazole include nausea, a metallic taste in your mouth, loss of appetite, and headaches. Some people experience stomach cramps, diarrhea, or dizziness. Your urine might turn darker than usual, which is harmless and goes away after treatment. Less common but more serious effects include tingling or numbness in your hands or feet, confusion, seizures, or severe skin reactions. A white coating on your tongue or unusual vaginal itching might signal a yeast infection developing. If you experience vision changes, severe headaches, or neck stiffness, contact your doctor immediately.
Who should NOT take Metronidazole or needs to be extra careful with it?
Don't take metronidazole if you've had an allergic reaction to it before or if you've taken disulfiram in the past two weeks. Pregnant women should only use it when absolutely necessary, especially during the first three months, and breastfeeding mothers should discuss timing with their doctor as it passes into breast milk. People with liver disease, kidney problems, blood disorders, or a history of seizures need careful monitoring. If you have nerve damage, stomach conditions like Crohn's disease, or are taking blood thinners, tell your doctor before starting treatment. Elderly patients may need adjusted doses.
Where can I buy Flagyl 400mg online and be sure I am getting a genuine medicine?
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