Flagyl ER (Metronidazole) 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, and in packages containing 90 to 360 pills, depending on the strength selected. Each pill is an extended-release tablet. Choosing the right option for your order means thinking through four things at once: which strength your prescriber has specified, how many tablets your course requires, which available package provides suitable value for that need, and how that quantity fits your planned storage and expiration timeline. This guide walks through each of those choices using our current catalog, so you can place an order that matches what you actually need.

Flagyl ER: Matching the Right Package to Your Treatment

Flagyl ER is a brand-name, extended-release formulation of metronidazole, a nitroimidazole antibiotic taken by mouth. Because it is extended-release, each tablet is designed to release the drug over time, which is why these tablets are swallowed whole rather than split or crushed. We offer Flagyl ER in 200 mg and 400 mg strengths, with several package quantities available for each strength. These package quantities describe our current offer; they do not indicate the dose, course length, or number of tablets that is medically appropriate for an individual. The choice between strengths and package sizes has cost and practical implications, but it must begin with the exact strength and regimen directed by a prescriber.

Comparing Our Flagyl ER Package Sizes and Value

Metronidazole is normally prescribed for a defined course, so matching your order quantity to a confirmed treatment need is more useful than simply chasing the lowest price per tablet. Our larger package options may provide a lower price per pill, and it helps to see that relationship clearly before you decide. The comparison below shows our current 400 mg package sizes side by side, including total price, price per unit, and relative savings.

When you look at the comparison, weigh the unit value of a larger package against how many tablets have actually been directed for your treatment. Metronidazole extended-release tablets should be stored at 68°F to 77°F in a tightly closed, light-resistant container and protected from light. Like any medicine, they also carry an expiration date. Buying more tablets than a confirmed course requires purely to obtain a lower unit price is not appropriate if the remaining medicine has no planned use or may expire. Do not save leftover antibiotics to treat a future illness without medical advice, because similar symptoms can have different causes and may require a different medicine.

A few factors are worth weighing before you select a package size:

• The strength and total number of tablets directed for the current course.
• Whether a larger quantity is supported by a current treatment plan rather than an unconfirmed future need.
• How long the medicine can be stored correctly before its labeled expiration date.
• The total price and price per pill shown for each relevant package option.

How Do I Choose Between the 200 mg and 400 mg Strength?

The strength you order should follow directly from what your prescriber has written. Metronidazole dose and treatment duration depend on the diagnosed infection, the formulation, and individual clinical factors. Extended-release schedules may differ from those used for immediate-release tablets, so patients should not choose a strength or calculate a replacement schedule solely by comparing milligram totals. A 400 mg tablet contains twice as much metronidazole as a 200 mg tablet, but that arithmetic does not by itself make two 200 mg tablets interchangeable with one 400 mg tablet in a prescribed regimen.

Strength is therefore a prescribing decision rather than primarily a value decision. Once the required strength is clear, our package options let you compare the quantities currently available:

If a prescriber adjusts your dose or schedule during treatment, re-check the required strength and total quantity before placing a new order with us. Do not change the number of tablets taken to use a different strength unless a qualified clinician has confirmed the revised instructions.

Flagyl ER vs. Generic Metronidazole and Related Antibiotics

Flagyl ER is a brand-name extended-release metronidazole product. Immediate-release metronidazole tablets contain the same active ingredient, but their release characteristics and dosing schedules can differ. The formulations should not be treated as automatically interchangeable unless a prescriber or pharmacist confirms the substitution and provides the appropriate instructions. For infections where metronidazole is not suitable, oral antibiotics such as Amoxil work through a different mechanism and target different organisms. They are not substitutes for metronidazole, and the appropriate choice depends on the diagnosed infection and likely or confirmed pathogen. Readers comparing oral antibiotic options more broadly can also browse our Antibiotics selection.

What Flagyl ER Treats

Metronidazole belongs to the nitroimidazole class and is active against susceptible anaerobic bacteria and certain protozoal organisms. Across its different formulations, clinicians use metronidazole for conditions that can include bacterial vaginosis, selected anaerobic bacterial infections, trichomoniasis, giardiasis, and amebiasis. However, uses and dosing are formulation-specific. A use established for immediate-release tablets or another metronidazole formulation should not automatically be assumed to apply to this extended-release product. A clinician should determine whether Flagyl ER is appropriate for the diagnosed infection and select the corresponding dose and duration.

Antibiotics do not treat viral infections such as colds or influenza. Using metronidazole when it is not indicated can expose a patient to adverse effects without providing a benefit and may contribute to antimicrobial resistance.

How Metronidazole Extended-Release Tablets Work and How to Take Them

Metronidazole enters susceptible anaerobic organisms and is converted into reactive compounds that disrupt DNA and other essential cellular processes. The extended-release formulation controls how the medicine is released, so the tablet should be swallowed whole rather than crushed, chewed, or split. Extended-release metronidazole is generally taken on an empty stomach, at least one hour before or two hours after a meal, unless the product directions or prescriber provide different instructions.

A few practical habits support safe, consistent use:

• Take each dose at approximately the same time according to the prescribed schedule.
• Swallow the tablet whole with water rather than crushing, chewing, or splitting it.
• Avoid alcohol and products containing propylene glycol during treatment and for at least three days after the final dose because unpleasant reactions can occur.
• Complete the directed course unless a clinician tells you to stop, even if symptoms improve earlier.

If you miss a dose, take it when remembered unless it is nearly time for the next scheduled dose. Do not take two doses together to make up for one that was missed. If the instructions are unclear, ask a pharmacist or prescriber before continuing.

How quickly symptoms improve depends on the infection and the individual response. Some people begin to feel better within several days, but early improvement does not mean the infection has been fully treated. Contact a clinician if symptoms worsen, do not begin to improve within the expected period, or return after treatment.

What Should I Know Before Taking Flagyl ER?

Metronidazole can cause nausea, a metallic taste, dry mouth, headache, or gastrointestinal upset. Less commonly, it has been associated with dizziness, confusion, peripheral neuropathy, visual disturbances, or seizures. Anyone experiencing effects that could impair alertness or coordination should avoid driving or operating machinery. Metronidazole is contraindicated in people with known hypersensitivity to metronidazole, other nitroimidazole derivatives, or relevant product ingredients. It should not be used with disulfiram taken within the previous two weeks, and alcohol and propylene glycol must be avoided during treatment and for at least three days afterward.

Important interactions include warfarin and other coumarin anticoagulants, whose effects may increase, as well as lithium and busulfan, whose concentrations or toxicity may rise. Medicines that alter liver enzymes can also affect metronidazole exposure. A prescriber or pharmacist should review all prescription medicines, nonprescription products, and supplements before treatment. Patients using warfarin may require closer clotting-time monitoring, while prolonged or repeated metronidazole treatment can call for blood-count or neurological monitoring.

Certain situations call for a conversation with a prescriber or pharmacist before starting this medicine:

• Pregnancy, since metronidazole crosses the placenta and use should be limited to situations where it is clearly needed.
• Breastfeeding, since metronidazole passes into breast milk at concentrations similar to those in the bloodstream.
• A history of seizures, peripheral neuropathy, or other neurological disease.
• Use in children, since the safety and effectiveness of the extended-release tablet have not been established in pediatric patients.
• Liver disease, including severe hepatic impairment, because reduced clearance can increase metronidazole exposure.
• Cockayne syndrome, which has been associated with severe liver injury during systemic metronidazole treatment.

Metronidazole is an established medicine authorized for human use in the United States. That ingredient-level status is separate from the identity of a particular brand, strength, package size, or presentation in our current offer.

Do I Need a Prescription to Order Flagyl ER From Us?

Metronidazole extended-release tablets are classified as prescription medicine in the United States. That regulatory classification is separate from our checkout requirements. Under our ordering policy, you do not need to submit a prescription for us to accept a Flagyl ER order, so you can select an offered strength and package size and complete checkout directly. Because the medicine remains prescription-classified, we encourage you to confirm with a prescriber or pharmacist that metronidazole, the selected strength, and the extended-release form are appropriate for the infection being treated before starting a course.

Ordering, Payment, and Delivery

Once you have chosen a strength and package size, our checkout confirms the exact option selected before the order is packed and dispatched. Review the strength and pill count carefully at checkout, particularly when the same quantity is available in both strengths. We have supported customers since 2018, and our support team, including a pharmacist, is available 24/7 if you have questions about an order before or after it ships.

Support is available in a few straightforward ways:

• Email support, answered by our team around the clock.
• Online chat for faster back-and-forth questions during the ordering process.
• Access to a pharmacist for medicine-specific questions.

When your delivery arrives, check the product name, strength, package quantity, and condition of the container before use. Keep the tablets in a tightly closed, light-resistant container at 68°F to 77°F, out of reach of children, and do not use tablets that are damaged or past their expiration date.

Choosing the Flagyl ER Option That Fits Your Needs

The most useful way to decide among our Flagyl ER options is to start with the exact product and strength directed for treatment, then confirm the required quantity, and only after that compare how the available package sizes affect total price and price per pill. A larger package may lower the unit cost, but it provides meaningful value only when the quantity is supported by a legitimate treatment need and can be stored correctly at 68°F to 77°F, protected from light, and used before expiration. The package comparison helps you assess our offer; it does not replace an individualized dosing plan. With strength, quantity, formulation, and value considered together, you can choose the available option that most closely matches the intended course rather than selecting a package solely because it has the lowest unit price.