AntiInfectiveMeds
Since 2010
| Quantity | Price per tablet | You save | Total price | |
|---|---|---|---|---|
| 120 | £0.50 | - | £60.00 | |
| 180 | £0.43 | £12.96 | £77.04 | |
| 270 | £0.38 | £32.78 | £102.23 | |
| 360 | £0.35 | £54.08 | £125.94 |
| Quantity | Price per tablet | You save | Total price | |
|---|---|---|---|---|
| 90 | £0.67 | - | £60.75 | |
| 120 | £0.61 | £7.65 | £73.34 | |
| 180 | £0.55 | £22.96 | £98.53 | |
| 270 | £0.51 | £45.19 | £137.05 | |
| 360 | £0.48 | £70.38 | £172.61 |
Your order is carefully packed and is dispatched within 24 hours. Here is what a typical package looks like.
Sized like a regular personal letter (approximately 24x11x0.7 cm), with no indication of what is inside.
| Delivery Method | Estimated delivery |
|---|---|
| Express Free for orders over £222.24 | Estimated delivery to the UK: 4-7 days |
| Standard Free for orders over £148.16 | Estimated delivery to the UK: 14-21 days |
We stock Flagyl ER, the extended-release oral tablet form of metronidazole, in 200 mg and 400 mg strengths, with several pack sizes for each so you can select an available quantity that is appropriate for your treatment plan. Because we supply metronidazole here as tablets rather than a liquid or gel, the real choices you make when ordering are strength, pack size and, in turn, price per pill, considered alongside whatever course length has been prescribed for you. This guide walks through each option we offer, together with the practical medical background that helps you use the tablets appropriately once they arrive.
Flagyl ER tablets contain metronidazole, a nitroimidazole antibiotic and antiprotozoal, in an extended-release dosage form. We supply the tablets in two strengths, 200 mg and 400 mg, taken by mouth. For the 200 mg strength we offer packs of 120, 180, 270 and 360 pills; for the 400 mg strength we offer packs of 90, 120, 180, 270 and 360 pills. This range gives you a choice among several fixed package quantities, but the amount ordered should still reflect the course and formulation specified for you.
Because larger packs may bring the price per pill down, it is worth comparing pack sizes before settling on a quantity, provided that quantity still matches a treatment plan that is appropriate for you. The comparison below sets out the exact prices, price per unit and relative savings across our current 400 mg pack sizes, so you can weigh cost against the supply you genuinely intend to use.
As the comparison shows, price per pill may fall as pack size increases, though the saving is only worthwhile if the larger pack matches your realistic treatment plan and storage capacity. Metronidazole tablets should be stored at 20°C to 25°C in a tightly closed, light-resistant container, so ordering more than you can reasonably use and store before the expiry date printed on the pack rarely makes sense, even when the per-pill price looks more attractive on paper.
Metronidazole is prescribed at different total daily doses depending on the infection, formulation and individual patient. The 200 mg and 400 mg strengths allow the prescribed dose to be assembled in different ways, but they should not be substituted for one another without checking the resulting dose and directions. The table below sets out the exact pack sizes we currently offer for each strength.
| Strength | Pack sizes we offer (pills) |
|---|---|
| 200 mg | 120, 180, 270, 360 |
| 400 mg | 90, 120, 180, 270, 360 |
When deciding between strengths and pack sizes, it helps to think through a few practical points:
Do not keep metronidazole to self-treat a future infection unless a prescriber has specifically instructed you to do so. Similar symptoms can have different causes and may require a different medicine, dose or course length.
We list Flagyl ER as an extended-release metronidazole tablet, distinct from plain metronidazole, which is not currently part of our range. If a prescription has been written for standard-release metronidazole rather than an extended-release product, that is a different formulation and may have a different dosing pattern, so it is worth checking exactly which formulation your prescription specifies before ordering. For infections where another nitroimidazole has been prescribed, we also carry Tinidazole and Secnidazole. These medicines are related to metronidazole, but their approved uses, doses and treatment schedules are not interchangeable. Anyone comparing antibiotic options more broadly is welcome to browse our range of antibiotics.
Metronidazole is established for treating susceptible infections caused by anaerobic bacteria and certain protozoa. Depending on the formulation and diagnosis, these may include bacterial vaginosis, some pelvic, dental, abdominal and skin infections, and protozoal infections such as giardiasis and amoebiasis. The exact indication and regimen for an extended-release product must be confirmed from its leaflet and the prescriber's directions rather than inferred from the uses of standard-release metronidazole.
An extended-release tablet is designed to release its active ingredient differently from a standard-release tablet, so the two forms should not be assumed to be interchangeable on a tablet-for-tablet basis. Follow the leaflet supplied with the pack for its release profile, licensed indication, dose and administration instructions.
Reasons a prescriber may select an appropriate metronidazole product include:
Metronidazole enters susceptible anaerobic bacteria and protozoa, where it is converted into reactive compounds that damage genetic material and disrupt the organism's ability to survive. Because this activation occurs particularly in susceptible organisms under low-oxygen conditions, metronidazole has limited activity against typical aerobic bacteria. It may therefore be combined with another antibiotic when a diagnosed infection involves organisms outside its spectrum.
Take Flagyl ER exactly as directed by your prescriber and the leaflet supplied with the pack. Extended-release tablets are generally swallowed whole and should not be crushed, chewed or split unless the specific product information expressly permits it, because damaging the tablet can alter how the medicine is released. Food instructions and dosing frequency can depend on the exact formulation, so do not assume a once-daily schedule or an empty-stomach requirement from the ER name alone. Most antibiotic courses run for a set number of days rather than being open-ended, and it is important to complete the prescribed course even if symptoms improve earlier.
A few practical points help the tablets remain suitable for the full course:
Metronidazole is generally well tolerated, but like any antibiotic it has a recognised side-effect profile. Reported effects can include:
Metronidazole can interact with warfarin and other coumarin anticoagulants, potentially increasing bleeding risk, and it can also interact with lithium, disulfiram and certain anticonvulsants. Tell your prescriber or pharmacist about all medicines and supplements you take before starting treatment. It should not be used by anyone with a known hypersensitivity to metronidazole, another nitroimidazole or an ingredient in the particular tablet. Extra assessment may also be needed for people with significant liver disease or a history of neurological or blood disorders, especially when treatment is prolonged or repeated.
During pregnancy, metronidazole should be used only when a prescriber judges it necessary, and high single-dose regimens are generally avoided. Metronidazole passes into breast milk; UK specialist guidance permits its use during breastfeeding in suitable circumstances, with monitoring of the infant for gastrointestinal effects, oral thrush, poor feeding or rash, while large single doses should be avoided. Metronidazole can occasionally cause dizziness, drowsiness, confusion, hallucinations or visual disturbance, so do not drive or operate machinery if affected. Children can be prescribed metronidazole, but paediatric dosing is determined by age and weight, and an extended-release tablet that must be swallowed whole may not be suitable for a younger child.
Metronidazole tablets are classified as prescription-only medicines in the UK. Suspected serious or unexpected side effects can be reported through the MHRA Yellow Card Scheme. This regulatory classification describes the medicine's status in the UK market rather than what we ask for at checkout: under our ordering policy for Flagyl ER, we do not require you to submit a prescription before we accept an order.
If you obtain metronidazole through the NHS, prescription charges may apply in England unless you are exempt, while NHS prescriptions are free in Scotland, Wales and Northern Ireland. The NHS also publishes patient information about taking metronidazole, cautions and possible side effects.
We have been serving pharmacy customers online since 2010, and our support team is available 24 hours a day by email, online chat and phone, with a pharmacist on hand to answer questions about your order before or after you receive it. Once you have chosen your strength and pack size, our checkout confirms the exact option selected, and we pack and dispatch orders for delivery to addresses across the UK. Providing the complete address and correct postcode helps avoid unnecessary delivery delays.
If you are unsure which pack size fits your circumstances, our support channels can help:
Ultimately, the right Flagyl ER option comes down to matching strength, pack size and price per pill to the course and formulation you have actually been directed to use, rather than choosing purely on the lowest headline price. Use the comparison above to see how cost scales across our 400 mg packs, check the available quantities for the specified strength, and keep the tablets stored correctly until they are needed. Ordering a quantity supported by your realistic current treatment plan, rather than automatically selecting the largest pack available, generally gives the best combination of value and appropriate use.
I'm in Belfast. Can I check whether Flagyl ER can be delivered to my address in Northern Ireland before I pay?
Yes. Enter your Belfast delivery address and postcode in the destination options at checkout before payment. The available options shown there will confirm whether delivery to that address is available.
I previously used metronidazole as a gel. What form of Flagyl ER do you sell?
Our listing is for oral extended-release tablets containing metronidazole. The available tablet strengths are 200 mg and 400 mg; it is not a gel, cream or vaginal preparation.
My son is 9 and has been prescribed metronidazole before. Are these extended-release tablets suitable for children?
Metronidazole can be used in children for selected infections, but paediatric treatment requires an age- and weight-based regimen. Whether an extended-release tablet is suitable depends on the required dose and the child's ability to swallow it whole, so a prescriber or pharmacist should confirm the formulation before it is used.
| Active ingredient | Metronidazole |
|---|---|
| Drug class | Nitroimidazole antibiotic |
| Dosage form | Extended-release tablet |
| Available strengths | 200 mg, 400 mg |
| Route | Oral |
| Storage | Store at 20°C to 25°C in a tightly closed, light-resistant container; protect from light. |
| ATC code | P01AB01 |
This product has 21 ratings, but only 4 written reviews so far. Share your experience and help other customers.
When I lived in London, delivery was two or three days faster. Since moving away, it took two or three days longer.
Nothing on the outer parcel advertised the contents; the Flagyl ER order was packaged discreetly.
I opened the order for metronidazole; the inner packaging was secure and the medicine was undamaged.
I checked the medicine and confirmed the 400 mg strength was the one selected at checkout.
