Flagyl ER (Metronidazole) Extended-Release Tablets: Prices, Strengths, and Package Options

We stock Flagyl ER, the extended-release oral tablet form of metronidazole, in two strengths and several package sizes so that returning and new customers can match an order to a defined treatment plan rather than guessing at quantity. Choosing the right option means looking at strength, pill count, unit value, and the amount authorized for the course or planned refill, and this guide walks through each of those choices using the packages we currently carry.

Metronidazole belongs to the nitroimidazole class of antibiotics. An extended-release tablet controls how the medicine is released and should not be treated as interchangeable with an immediate-release metronidazole tablet. Dosing frequency and course length depend on the prescribed regimen, so package comparisons should begin with the exact formulation and directions rather than an assumption about how many tablets will be taken each day.

The Real Choices You're Making

When you order Flagyl ER from us, you are choosing among three things at once: the tablet strength (200 mg or 400 mg), the package quantity available for that strength, and the pill count that lines up with the treatment plan your prescriber has specified. We count and price every package in pills, so the unit you see at checkout is always the individual tablet.

Strength and quantity answer different questions. Strength determines how much metronidazole each tablet contains, while package quantity determines how many tablets are supplied. A package with more pills is not a higher-strength product, and a lower unit price does not make a package medically preferable if its strength or quantity does not match the intended regimen.

Available Packages and Unit Value

Because a lower price per pill only matters if the package size fits how long you will actually be taking Flagyl ER, the comparison below is built around exact totals rather than a single headline price. It lines up every package quantity we offer for the 400 mg strength against its total cost and price per tablet, so you can see where unit value improves as package size increases and where a smaller package may better fit the planned supply.

The comparison covers all five quantities currently offered for Flagyl ER 400 mg. It lets you compare total outlay with unit value: a larger package may have a lower price per tablet while still requiring a higher payment at checkout. The best-value option is therefore the one that supplies the correct strength and useful quantity at an acceptable total cost, not automatically the package with the lowest unit figure.

The same decision process applies to the 200 mg strength, although its available quantities differ. Across both strengths, the packages we currently carry are:

• 200 mg tablets: packages of 120, 180, 270, or 360 pills
• 400 mg tablets: packages of 90, 120, 180, 270, or 360 pills

Larger packages may lower the price per tablet, but that benefit is useful only when the quantity corresponds to a prescribed course, an authorized refill, or another defined supply need. Buying extra tablets in anticipation of an unconfirmed longer or repeated course can leave an unnecessary surplus and should not replace a clinician's decision about further treatment.

Matching Strength, Form, and Quantity to Your Course

How Should You Decide Between the 200 mg and 400 mg Tablets?

Metronidazole dosing is selected according to the infection being treated, the formulation, the patient's clinical circumstances, liver function, interacting medicines, and other relevant factors. The package options on this page should not be used to calculate a dose. We offer both 200 mg and 400 mg extended-release tablets so customers whose treatment instructions specify one of these strengths can select the matching option without substituting an immediate-release product or altering an extended-release tablet.

The table below summarizes the package counts we carry for each strength side by side. This makes it possible to compare how many tablets are supplied at each available package size before considering the exact price shown for the selected option.

For quantity planning, start with the number of tablets directed per day, multiply it by the prescribed number of treatment days, and include only refills or additional courses that have actually been authorized. If that total does not correspond neatly to an available package, confirm the appropriate quantity with a prescriber or pharmacist rather than changing the dose, splitting an extended-release tablet, or extending treatment to use the remaining pills.

A few practical points are worth weighing alongside strength and package size:

• Match the package to the prescribed course and any authorized refills rather than adding tablets for possible missed doses or unconfirmed future treatment.
• Check the expiration date when the package arrives and make sure the tablets will remain within their labeled shelf life for the intended supply period.
• Keep tablets at 68°F to 77°F in a tightly closed, light-resistant container and protect them from direct light.
• Consider both total checkout cost and price per pill; a larger package provides value only when its full quantity has an appropriate planned use.

Brand, Generic, and Related Antibiotic Context

Flagyl ER is the brand name for the extended-release metronidazole tablet we sell. Generic metronidazole is also available in other formulations, including immediate-release tablets, but products with different release characteristics can have different dosing instructions and should not be substituted solely because they contain the same active ingredient.

Other nitroimidazole medicines, such as tinidazole and secnidazole, cover some of the same organisms or indications but have their own dosing schedules, contraindications, and approved uses. Clindamycin may be considered for certain anaerobic infections or bacterial vaginosis when clinically appropriate. Vancomycin has an important role in specific serious gram-positive infections and in certain regimens for Clostridioides difficile infection, but it is not a general substitute for metronidazole. A clinician should select among these medicines according to the organism, infection site, susceptibility information, and patient-specific risks. If you are exploring treatment types more broadly, our Antibiotics selection provides a useful starting point.

What Flagyl ER Is Used For

Metronidazole enters susceptible anaerobic bacteria and certain protozoa, where it is converted into reactive compounds that damage microbial DNA and disrupt replication. The extended-release oral formulation is established for bacterial vaginosis, while metronidazole in other formulations is used for various anaerobic bacterial and protozoal infections, including trichomoniasis, amebiasis, and giardiasis. Those broader uses do not mean that every metronidazole formulation or schedule is interchangeable.

Metronidazole does not treat viral illnesses, and it should be used only for an infection for which it is appropriate. Depending on the condition, diagnosis may involve symptoms, examination, laboratory testing, or identification of a likely organism. Readers researching bacterial vaginosis may also find our Women's Health listings useful for related care.

How It Works and How to Take It

Flagyl ER tablets are designed to release metronidazole over an extended period. Follow the exact dosing schedule supplied for the product and condition being treated rather than applying directions from immediate-release metronidazole. Extended-release labeling generally directs patients to take the tablet on an empty stomach, about one hour before or two hours after a meal. Tablets should be swallowed whole because crushing, chewing, or splitting them can interfere with the intended release pattern.

How quickly symptoms improve varies with the infection, its severity, and the patient's response. Feeling better does not necessarily mean the infection has been fully treated, so the prescribed course should be completed unless a clinician directs otherwise. Contact a healthcare professional if symptoms worsen, do not begin to improve within the expected period, or return after treatment.

• Take each dose at approximately the same time according to the prescribed schedule.
• Avoid alcohol and products containing propylene glycol during treatment and for at least three days after the final dose.
• If a dose is missed, take it when remembered unless it is almost time for the next dose; do not take two doses at once.
• Keep the tablets in their protected container and do not stop the course early solely because symptoms have eased.

Safety, Interactions, and Who Should Be Cautious

Metronidazole is contraindicated for anyone with known hypersensitivity to metronidazole, other nitroimidazole derivatives, or relevant product ingredients. It should not be used with disulfiram or within two weeks after disulfiram use because psychotic reactions have been reported. Alcohol and products containing propylene glycol should also be avoided during treatment and for at least three days afterward because abdominal cramps, nausea, vomiting, headache, and flushing can occur.

Commonly reported adverse effects include nausea, metallic taste, headache, abdominal discomfort, and other gastrointestinal symptoms. Less common but potentially serious effects include peripheral neuropathy, seizures, encephalopathy, confusion, and blood-cell abnormalities. New numbness, tingling, severe unsteadiness, seizures, marked confusion, or a serious rash warrants prompt medical attention. Because dizziness, confusion, or visual disturbances can occur, patients affected by these symptoms should not drive or operate machinery.

Metronidazole can increase the anticoagulant effect of warfarin and related medicines, so clotting tests and dose adjustment may be needed. It can also raise lithium concentrations, while medicines that induce or inhibit liver enzymes may alter metronidazole exposure. Significant liver impairment can reduce clearance and may require a modified regimen. For prolonged or repeated treatment, clinicians may monitor neurologic symptoms, liver function, blood counts, or interacting drug levels according to individual risk.

Metronidazole crosses the placenta and is present in human milk at concentrations similar to those in plasma. Use during pregnancy or breastfeeding should therefore be discussed individually with a prescriber. Safety and effectiveness of oral extended-release metronidazole tablets have not been established in pediatric patients.

Do You Need a Prescription to Order Flagyl ER in the United States?

Metronidazole is authorized for human medicinal use in the United States, and the extended-release tablet dosage form we carry is classified as a prescription medicine under US regulation. That legal classification is separate from our ordering policy: we do not require you to submit a prescription for us to accept and process an order for Flagyl ER.

Our ordering policy does not change the importance of using the medicine under appropriate clinical guidance. Before selecting a strength or quantity, make sure you understand the intended formulation, dose, course length, contraindications, and relevant interactions. Our pharmacist-supported team is available 24/7 by email, online chat, and phone if you have questions about the product options or ordering process before checkout.

Ordering, Delivery, and What to Expect

We have operated our catalog and ordering process since 2017. Every Flagyl ER order is priced and confirmed in US dollars at checkout, where the selected strength and package quantity are displayed before payment. Review those details carefully, particularly when comparing package sizes that are available in both strengths.

Once an order is placed, our team packs it for dispatch and ships it to the ZIP code you provide. Shipping describes the service used to send the order, while delivery refers to the package reaching the destination. Our support staff can answer questions about packing, dispatch timing, shipping, or delivery status along the way. When the package arrives, compare the product name, strength, extended-release form, and pill count with the order confirmation before use. If anything does not match what you selected, contact our support team promptly so the issue can be reviewed.

Making the Value-Based Decision

Choosing the right Flagyl ER order comes down to aligning three things: the specified strength, a package quantity that covers the authorized supply without creating a large unused surplus, and the per-tablet value shown for the relevant option. The 400 mg comparison near the beginning of this guide makes the total-cost and unit-value tradeoff visible across all five available quantities, while the package table shows how the offered counts differ between 200 mg and 400 mg.

A bigger package may lower the cost per pill, but it adds genuine value only when the tablets have a planned use and can be stored correctly within their labeled shelf life. Confirm the formulation and regimen first, compare total cost as well as unit cost, and then choose the smallest available quantity that appropriately covers the planned supply. That approach keeps medical suitability, practical value, and budget in the right order.