Flagyl ER Extended-Release Tablets: Prices and Package Options

We carry Flagyl ER, the extended-release oral tablet form of metronidazole, in two strengths, 200 mg and 400 mg, so customers can match their order to what a prescriber has directed. Because metronidazole extended-release tablets are meant to be taken as part of a defined course rather than as an open-ended supply, the package quantity should follow the current treatment plan first. Unit value is a secondary comparison once the required strength and number of tablets are known.

Below, we walk through the exact package choices available from us, how strength and quantity interact, where Flagyl ER fits next to related antimicrobial options, and what our ordering and delivery process looks like for customers across Canada.

Flagyl ER at a Glance: Strengths, Quantities, and Choices

Flagyl ER is supplied as an oral extended-release tablet designed for once-daily administration, rather than the divided dosing often used with immediate-release metronidazole. We offer the 200 mg strength in packs of 120, 180, 270, or 360 tablets, and the 400 mg strength in packs of 90, 120, 180, 270, or 360 tablets. Each package is counted by individual tablet, which makes it possible to compare quantities and unit value directly.

Choosing between these options comes down to three practical questions: which strength has been directed, how many tablets the current treatment plan calls for, and which available package meets that need with the least unnecessary excess. Strengths should not be exchanged or combined unless the prescriber or pharmacist confirms the intended dose.

Which Flagyl ER package size offers the best value?

Unit value becomes easier to see once quantities are placed side by side. The comparison below presents the exact total prices, per-tablet value, and relative savings across all five of our current 400 mg package quantities.

Larger packages may have a lower price per tablet, but that saving is useful only when the quantity is appropriate for an active treatment plan. Even the smallest package offered here may contain more tablets than some individual courses require. Ordering extra antimicrobial medicine for possible future self-treatment is not good value and can lead to inappropriate reuse, expired stock, or delayed assessment of a new infection.

Confirm the total number of tablets required before choosing a package. If more than one available quantity would appropriately cover the authorized order, the comparison can help distinguish their unit value. Do not extend a course, repeat treatment, or save leftover tablets for a later illness unless a qualified health professional specifically directs you to do so. A pharmacist can also advise how to return or dispose of medicine that is no longer needed.

Choosing Between the 200 mg and 400 mg Tablets

Strength and quantity work together, not separately. A prescriber's selected dose determines how many tablets of a particular strength are needed, while the package quantity determines how many tablets arrive in the order. A 200 mg tablet and a 400 mg tablet are not interchangeable on a one-for-one basis, and an extended-release tablet should not be altered to create a different strength.

A few practical points can help with this decision:

• Confirm both the exact strength and the total tablet quantity directed for the current course before ordering.
• Do not substitute two lower-strength tablets for one higher-strength tablet, or the reverse, unless a prescriber or pharmacist has confirmed the dosing instructions.
• Choose the smallest available package that appropriately fulfils the intended order rather than selecting excess tablets solely for a lower unit price.
• Extended-release tablets should be swallowed whole. Splitting, crushing, or chewing them can interfere with their modified-release characteristics.
• Check the expiry date when the package arrives, and do not use tablets left from an earlier course to treat a new illness without medical assessment.

Flagyl ER, Tinidazole, and Secnidazole

Metronidazole belongs to the nitroimidazole class of antimicrobials, and Flagyl ER is an extended-release oral form intended to support once-daily administration. Immediate-release metronidazole products can have different strengths, schedules, and approved uses, so their directions should not be applied automatically to Flagyl ER.

For patients whose prescriber has selected another nitroimidazole, we also carry Tinidazole and Secnidazole. These medicines share aspects of metronidazole's antimicrobial mechanism but differ in half-life, dosing schedule, approved indications, interaction details, and available dosage forms. They are not direct substitutes for Flagyl ER, and a lower dose frequency does not necessarily make one option more suitable for a particular infection. Customers reviewing prescribed anti-infective options can also browse our Antibiotics selection.

What Flagyl ER Is Used For

Extended-release metronidazole is used for infections caused by susceptible anaerobic bacteria and certain protozoa, with extended-release product labelling supporting once-daily adult treatment of bacterial vaginosis. The correct product and regimen depend on the organism, infection site, patient factors, and applicable product labelling. Metronidazole does not treat viral illnesses, and its limited activity against typical aerobic bacteria means it is not a general-purpose treatment for every bacterial infection.

• Bacterial vaginosis in adults when an extended-release metronidazole regimen is selected.
• Susceptible anaerobic bacterial infections when the formulation and regimen are appropriate.
• Certain protozoal infections for which a clinician has selected nitroimidazole treatment.

Symptoms may begin to improve during the first few days, but response time varies with the infection and its severity. Finish the directed course unless a health professional tells you to stop. Seek reassessment if symptoms worsen, do not begin to improve as expected, or return after treatment, because another diagnosis, organism, or medicine may need to be considered.

How does metronidazole extended-release work, and how should it be taken?

Metronidazole enters susceptible anaerobic bacteria and protozoa, where it is reduced to reactive intermediates that disrupt microbial DNA and inhibit nucleic-acid synthesis. This activity depends partly on conditions inside susceptible anaerobic organisms, which helps explain why metronidazole has limited activity against typical aerobic bacteria.

The extended-release formulation releases metronidazole over an extended period and is generally administered once daily. Follow the directions supplied for the exact product. Extended-release metronidazole is generally taken on an empty stomach, at least one hour before or two hours after food, because food can change its absorption. Swallow the tablet whole with water rather than splitting, crushing, or chewing it.

• Take each dose at a consistent time and follow the exact duration directed for the infection.
• Swallow the extended-release tablet whole; do not split, crush, or chew it.
• Complete the directed course even if symptoms improve early, unless a health professional advises otherwise.
• If a dose is missed, follow the product instructions or ask a pharmacist; do not double the next dose unless specifically directed.
• Avoid alcoholic drinks and products containing alcohol or propylene glycol during treatment and for at least three days after the last dose.

Safety Considerations, Interactions, and Precautions

Common adverse effects of metronidazole include nausea, abdominal discomfort, reduced appetite, headache, and a metallic taste. Dizziness can also occur. Serious reactions are less common, but new numbness, tingling, poor coordination, confusion, seizures, severe rash, unusual bruising, or persistent vomiting requires prompt medical advice. Peripheral neuropathy is of particular concern with prolonged or repeated exposure.

Metronidazole should not be used by someone with known hypersensitivity to metronidazole, another nitroimidazole, or an ingredient in the formulation. It is also important to disclose significant liver disease, neurologic disorders, blood disorders, Cockayne syndrome, pregnancy, or breastfeeding before treatment. Severe liver toxicity has been reported in people with Cockayne syndrome, and impaired liver function may increase metronidazole exposure.

• Alcohol and products containing propylene glycol can cause an unpleasant reaction during treatment and for at least three days afterward.
• Metronidazole should not be taken during or within two weeks after disulfiram because psychotic reactions can occur.
• Warfarin and other coumarin anticoagulants may have an increased effect, so clotting tests and dose adjustments may be required.
• Lithium concentrations can rise, while phenytoin, phenobarbital, busulfan, ciclosporin, fluorouracil, and some other medicines may require additional review or monitoring.
• Metronidazole crosses the placenta and is present in human milk. Pregnancy requires an individual benefit-risk assessment, and breastfeeding guidance may include interruption during treatment and for 24 to 48 hours after the last dose.
• Dizziness, confusion, visual disturbances, or poor coordination can impair driving and machinery use. Avoid these activities until you know how the medicine affects you.
• Safety and effectiveness of extended-release metronidazole have not been established in children.

Routine laboratory monitoring is not needed for every short course, but liver function, blood counts, neurologic symptoms, anticoagulation, or interacting medicine levels may need monitoring in higher-risk patients or during prolonged or repeated treatment.

Do we require a prescription to order Flagyl ER in Canada?

Oral metronidazole is classified as a prescription medicine in Canada and ordinarily requires authorization from an eligible prescriber. Health Canada's Drug Product Database provides current product labels and sponsor details for medicines authorized in Canada.

That Canadian regulatory classification is separate from our own ordering policy. We do not require customers to submit a prescription through our checkout to have an order accepted. This policy does not make metronidazole a non-prescription medicine in Canada and does not replace the need for an appropriate diagnosis, dosing directions, or clinical supervision. Our pharmacist is available to answer product and order questions, but customers should consult an authorized prescriber for diagnosis and individualized treatment decisions.

Public drug coverage, where applicable, is determined by the relevant provincial or territorial plan and the patient's eligibility rather than by one universal national formulary. Coverage or reimbursement should therefore be checked directly with the applicable plan.

Ordering, Packing, and Delivery

We have supported customers across Canada since 2010. Our support team is available 24/7 by email, online chat, and phone, and a pharmacist is available to answer appropriate medicine and order questions. Payment, packing, dispatch, and shipping are handled through our standard checkout process. We pack the tablets to help protect them from light and temperature extremes while they are in transit.

• Select the Flagyl ER strength and package quantity shown on this page that correspond to the intended order.
• Review the strength, number of tablets, delivery address, and payment details before completing checkout.
• Contact our pharmacist if you have questions about administration, storage, potential interactions, or the product received.
• Use the tracking details supplied after dispatch to follow delivery, and contact our support team if the parcel is delayed or damaged.
• Inspect the package on arrival and confirm the product name, strength, tablet quantity, expiry date, and condition before use.

Matching Your Package Choice to Your Treatment Plan

Start with the exact prescribed or clinician-directed strength and the total number of tablets required. Then compare that need with our available quantities: 120, 180, 270, or 360 tablets for 200 mg, and 90, 120, 180, 270, or 360 tablets for 400 mg. If the offered package contains more than the current course requires, do not lengthen treatment or keep the remainder for unsupervised treatment of a future illness.

Store Flagyl ER at 20°C to 25°C in a tightly closed, light-resistant container, protect it from light, and keep it out of reach of children. Retain the original label so the identity, strength, expiry date, and directions remain clear. Ask a pharmacist about local medicine-return options for tablets that expire or are no longer required; do not share them with another person.

Price per tablet can help distinguish otherwise suitable package options, but it should not override the intended dose, course length, expiry considerations, or safe-use requirements. The best-value choice is the available strength and quantity that appropriately supports the current treatment plan without encouraging unnecessary antimicrobial use.