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

We carry Flagyl ER, an oral extended-release tablet containing metronidazole, in two strengths: 200 mg and 400 mg. The main purchasing decision is how to match the prescribed strength and quantity to one of our available package sizes without treating the lowest per-tablet cost as the only measure of value. Below, we explain the exact options we stock, how to compare package value, what distinguishes extended-release tablets from other metronidazole products, and what to check before placing an order.

Flagyl ER Price and Choice Overview

Our current offer covers 200 mg and 400 mg extended-release tablets. The 200 mg strength is available in packages of 120, 180, 270, and 360 pills, while the 400 mg strength is available in packages of 90, 120, 180, 270, and 360 pills. In this catalog, each pill is one extended-release tablet.

Price comparisons are most useful when they answer two separate questions: what is the total package cost, and does that quantity correspond to the treatment plan? A larger package may provide a lower cost per tablet, but it is not automatically the better choice if it substantially exceeds the quantity prescribed. Metronidazole should not be saved for an unrelated future illness or shared with another person, and unused tablets should be handled according to appropriate medication-disposal guidance.

Available Package Sizes and Unit Value

We offer Flagyl ER 400 mg in five package sizes: 90, 120, 180, 270, and 360 tablets. Flagyl ER 200 mg is available in packages of 120, 180, 270, and 360 tablets. The comparison below presents our current total prices, per-tablet cost, and relative savings across the five 400 mg package options so that you can compare total spending with unit value.

Use the comparison as one part of the decision rather than as a reason to order more medication than needed. Before choosing a package, confirm the strength, number of tablets per dose, dosing frequency, and treatment duration shown on the prescription or dispensing instructions. If none of the listed package quantities closely matches the intended supply, ask a prescriber or pharmacist how the package should be used rather than changing the regimen to fit the package.

Other practical value factors include the printed expiration date, whether the tablets can remain in a tightly closed and light-resistant container, and whether the package will be stored correctly for its entire period of use. We date and pack stock so that a standard course finishes within the printed expiration date, but customers considering a larger package should still check the supplied product and expiration information when it arrives.

Choosing Your Strength, Form, and Quantity

Both offered strengths are extended-release oral tablets, but the letters "ER" do not by themselves establish the correct dose or confirm that every presentation follows the same schedule. Some metronidazole extended-release regimens are taken once daily, but customers should follow the directions for the exact manufacturer, strength, and indication supplied. Do not create a dose by combining 200 mg and 400 mg tablets unless the prescriber or dispensing label specifically instructs you to do so.

When comparing strengths and quantities, consider these practical points:

• Prescribed strength: select the strength written on the prescription or confirmed by the prescriber rather than choosing solely by unit price.
• Exact regimen: verify the number of tablets per dose, the dosing frequency, and the treatment duration. Extended-release and immediate-release directions are not interchangeable.
• Package fit: compare the total number of tablets required with the available package quantities, and ask for guidance if a package contains substantially more than the planned course.
• Administration: swallow extended-release tablets whole unless the exact product label explicitly says otherwise. Crushing, chewing, or splitting an extended-release tablet can alter how the medicine is released.
• Storage and expiration: choose a quantity that can be used as directed and stored correctly before the printed expiration date.

Food instructions can also differ by formulation. Some metronidazole extended-release labeling directs patients to take the dose on an empty stomach, such as at least one hour before or two hours after a meal. Follow the instructions supplied with the exact product rather than applying directions from a different metronidazole formulation.

Flagyl ER, Generic Metronidazole, Tinidazole, and Secnidazole

Flagyl ER is a brand name associated with extended-release metronidazole. A generic product may be an appropriate equivalent only when its active ingredient, strength, dosage form, release type, and labeling match what was prescribed. The word "metronidazole" alone does not establish equivalence because standard immediate-release tablets, extended-release tablets, capsules, topical products, and vaginal products have different uses and administration instructions.

• Flagyl ER and matching generic extended-release products: both contain metronidazole, but the exact strength, release characteristics, manufacturer, and product labeling should be verified before substitution.
• Immediate-release metronidazole: this is a different dosage form that may be taken on a different schedule and should not be substituted tablet for tablet for an extended-release product.
• Related nitroimidazoles: Tinidazole and Secnidazole act against some similar susceptible organisms, but they differ in approved uses, dosing, duration, interactions, and patient suitability.

A lower price for a different formulation or active ingredient does not make it a direct replacement. A prescriber should decide whether a brand, generic, immediate-release product, or related nitroimidazole is suitable for the infection being treated.

What Is Flagyl ER Used For?

Metronidazole is a nitroimidazole antimicrobial used against susceptible anaerobic bacteria and certain protozoa. Depending on the specific formulation and label, metronidazole products may be used for conditions such as bacterial vaginosis, trichomoniasis, amebiasis, giardiasis, and selected anaerobic bacterial infections. However, those indications do not automatically apply to every strength or release type.

Extended-release metronidazole labeling has a narrower product-specific role than the complete range of uses associated with immediate-release metronidazole. Follow the supplied label for the diagnosed condition and prescribed regimen. Metronidazole does not treat viral illnesses, and using it for an infection that is not susceptible can delay appropriate care and contribute to antimicrobial resistance.

Symptoms may begin improving during a prescribed course, but the timing depends on the infection, its severity, and the patient's response. Do not stop early, extend treatment, or reuse remaining tablets solely because symptoms improve, persist, or recur. Contact the prescriber if symptoms worsen, fail to improve as expected, or return after treatment.

How Does Metronidazole Extended-Release Work?

Metronidazole is activated inside susceptible anaerobic organisms. Reactive metabolites interact with DNA and disrupt nucleic acid synthesis, damaging the organism and preventing normal survival. Human cells and organisms that do not activate metronidazole in the same way are less susceptible to this effect.

The extended-release dosage form is designed to release metronidazole more gradually than an immediate-release tablet. That design can support less frequent dosing for certain labeled regimens, but it does not mean that every extended-release strength is taken once daily or that customers can convert an immediate-release dose on their own. Use only the schedule printed on the exact dispensing label.

For practical administration:

• Take each dose at the scheduled time and follow the exact food instructions supplied with the product.
• Swallow the extended-release tablet whole with water unless product-specific instructions clearly permit another method.
• If a dose is missed, follow the product instructions or ask a pharmacist; do not routinely double the next dose.
• Complete the prescribed course unless a clinician tells you to stop because of an adverse reaction or a change in treatment.
• Avoid alcohol and products containing propylene glycol during treatment and for at least three days after the final dose, in line with metronidazole labeling.

Safety, Precautions, and Drug Interactions to Know

Metronidazole is contraindicated in people 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 because psychotic reactions have been reported. A prescriber should also review significant liver disease, neurologic disorders, blood disorders, pregnancy, breastfeeding, and any previous serious reaction to a nitroimidazole.

Important interactions and precautions include:

• Warfarin and related anticoagulants: metronidazole can increase anticoagulant effects and may require closer monitoring of clotting tests and dose adjustment by a clinician.
• Lithium: concurrent use can increase lithium concentrations and the risk of toxicity, so monitoring may be needed.
• Seizure medicines: phenytoin and phenobarbital can interact with metronidazole, and metronidazole may affect phenytoin handling.
• Disulfiram: avoid concurrent use and use within the preceding two weeks.
• Alcohol and propylene glycol: avoid them during treatment and for at least three days afterward because labeling warns of abdominal cramps, nausea, vomiting, headache, and flushing.
• Neurologic effects: dizziness, confusion, impaired coordination, seizures, encephalopathy, and peripheral neuropathy have been reported. Anyone affected should avoid driving or operating machinery and seek medical advice.
• Pregnancy and breastfeeding: metronidazole crosses the placenta and enters human milk. The prescriber should weigh the indication, formulation, treatment duration, and available alternatives.

Common adverse effects include nausea, stomach discomfort, reduced appetite, headache, and a metallic or unpleasant taste. Dark or reddish-brown urine can occur because of a metronidazole metabolite and is usually not clinically significant, but unexpected urine changes can still be discussed with a clinician. Seek urgent help for trouble breathing, facial swelling, a severe or blistering rash, seizures, marked confusion, loss of coordination, or other signs of a serious reaction.

Prolonged or repeated treatment may require clinical review and laboratory monitoring, particularly when there is liver impairment, a history of blood-cell abnormalities, or new numbness and tingling. Patients should give the prescriber and pharmacist a complete list of prescription medicines, over-the-counter products, supplements, and relevant health conditions before starting treatment.

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

Oral metronidazole, including extended-release tablets, is classified as a prescription medicine in the United States. That regulatory classification is separate from our ordering process: our policy does not require customers to upload a prescription document before selecting a strength and package quantity and completing checkout. A qualified prescriber should still determine whether metronidazole is appropriate and provide the regimen to follow.

Coverage is a separate question from ordering access. Medicare Part D coverage and out-of-pocket cost depend on the individual plan formulary, and there is no single CMS reimbursement status that applies to every metronidazole product or customer.

Ordering, Delivery, and Receiving Your Medication

We have operated as an online pharmacy since 2010, and our support team, including a pharmacist, is available 24/7 by email, online chat, and phone. Once you select the intended strength and package quantity at checkout, our ordering and delivery process includes the following steps:

• We confirm the strength and quantity selected before packing the order.
• We pack the tablets to protect them from light and moisture in transit, consistent with the stated storage conditions.
• We ship to US addresses and use the destination ZIP code to route delivery and provide available tracking information.
• Our support team can answer questions about order status, packaging, or general product information.
• When the package arrives, check the product name, active ingredient, strength, extended-release designation, tablet count, manufacturer details, seal, and expiration date before use.

At home, store Flagyl ER tablets at 68°F to 77°F in a tightly closed, light-resistant container. Protect them from direct light and excess humidity, keep them out of reach of children and pets, and do not use tablets that are damaged, improperly sealed, or past the printed expiration date.

Making the Best Value Decision for Your Supply

The best-value package is the one that provides the correct prescribed product and a suitable quantity at a reasonable total and per-tablet cost. Before choosing, confirm that the intended medicine is metronidazole in an extended-release oral tablet, verify whether the prescribed strength is 200 mg or 400 mg, and calculate the required number of tablets from the actual regimen. Then compare that requirement with the package quantities we offer.

A final decision checklist can help:

• Confirm the active ingredient, strength, extended-release form, and oral route.
• Verify the product-specific dosing and food instructions rather than relying on directions for another metronidazole formulation.
• Choose a package quantity that reasonably corresponds to the prescribed course or planned supply.
• Compare both total package cost and cost per tablet in the package-value comparison.
• Check interactions, contraindications, alcohol precautions, storage requirements, and the printed expiration date.
• Ask a prescriber or pharmacist before substituting another formulation or a related medicine.

If you are exploring treatments used for susceptible anaerobic or parasitic infections, our antibiotics selection provides a useful place to review other options for discussion with a prescriber. The package-value comparison above should ultimately support a medically appropriate choice, not replace the diagnosis, product verification, or dosing instructions needed for safe treatment.