What is a Generic Drug?

A generic drug is a copy of the brand-name drug with the same dosage, safety, strength, quality, consumption method, performance, and intended use. Before generics become available on the market, the generic company must prove it has the same active ingredients as the brand-name drug and works in the same way and in the same amount of time in the body.

The only differences between generics and their brand-name counterparts is that generics are less expensive and may look slightly different (eg. different shape or color), as trademarks laws prevent a generic from looking exactly like the brand-name drug.

Generics are less expensive because generic manufacturers don't have to invest large sums of money to develop a drug. When the brand-name patent expires, generic companies can manufacture a copy of the brand-name and sell it at a substantial discount.

Flagyl S Suspension (Metronidazole)


Flagyl S Suspension (Metronidazole)

Prescription Required

200mg / 5ml 100ml

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  • Product Details


    Flagyl S is a prescription medication used to treat bacterial infections caused by certain types of microorganisms. It is commonly used to treat the following infections:

    • Amebiasis, intestinal or extraintestinal
    • Bacterial vaginosis
    • Balantidiasis
    • Clostridioides difficile infection, treatment
    • Dientamoeba fragilis infection
    • Giardiasis
    • Helicobacter pylori eradication
    • Intra-abdominal infection
    • Intracranial abscess
    • Odontogenic infection
    • Pneumonia, aspiration
    • Pouchitis, acute
    • Sexually transmitted infections
    • Skin and soft tissue infection
    • Surgical prophylaxis
    • Tetanus

    It contains metronidazole, an antibiotic and antiprotozoal medication that kills or stops the growth of bacteria and other microorganisms. Metronidazole is incorporated into the DNA and causes the double-helix structure to unwind, preventing replication.

    Fact Table




    US DailyMed, US FDA



    Legal status


    Chemical Name


    Elimination half-life

    8 hours

    Dosage (Strength)

    200mg / 5ml 100ml


    Consult Doctor



    Protein binding


    PubChem CID






    ATC code






    Routes of administration



    Flagyl S is available as a 200 mg/5 mL oral suspension. It should be taken with food to avoid stomach upset.

    The usual dose for adults varies from 400-1000 mg every eight hours. The pediatric dosage is based on weight and will be determined by the healthcare team.


    The active ingredient in Flagyl S is metronidazole, which is an antibiotic and antiprotozoal medication.


    Common interactions with this medication may include:

    • Alcohol (Ethyl)
    • BCG (Intravesical)
    • BCG Vaccine (Immunization)
    • Bupropion
    • Carbocisteine
    • Cholera Vaccine
    • Dacomitinib
    • Dexamethasone
    • Disulfiram
    • DroNABinol
    • Fluorouracil Products
    • Fluoxetine
    • Fosphenytoin
    • Haloperidol
    • Immune Checkpoint Inhibitors
    • Lactobacillus and Estriol
    • Lithium
    • Mebendazole
    • Mycophenolate
    • Paroxetine
    • PHENobarbital
    • Phenytoin
    • Primidone
    • Quinidine
    • Tipranavir


    Do not take Flagyl S if you are pregnant or breastfeeding unless directed by your doctor.

    Tell your healthcare provider about any history of seizures, liver disease, or blood disorders before using Flagyl S.

    The medication may interact with alcohol and can cause severe side effects such as nausea, diarrhea, and headache.

    Side Effects

    The most common adverse reactions may include:

    • Abdominal pain
    • Bacterial infection
    • Candidiasis
    • Diarrhea
    • Dizziness
    • Dysmenorrhea
    • Flu-like symptoms
    • Genital pruritus
    • Headache
    • Metallic taste
    • Nausea
    • Pharyngitis
    • Rhinitis
    • Sinusitis
    • Upper respiratory tract infection
    • Urinary tract infection
    • Urine abnormality
    • Vaginitis
    • Xerostomia


    1. Flagyl-S oral suspension [package insert]. Sylvia Park, Auckland: Sanofi; 2022.

    IMPORTANT NOTE: The above information is intended to increase awareness of health information and does not suggest treatment or diagnosis. This information is not a substitute for individual medical attention and should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. See your health care professional for medical advice and treatment.

    Product Code : 13845

  • Product Reviews


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