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.

Firvanq (Vancomycin Hydrochloride)


Firvanq (Vancomycin Hydrochloride)

Prescription Required

Brand 25mg / ml 150 ml
Brand 25mg / ml 300 ml
Brand 50mg / ml 150 ml

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  • Product Details


    Firvanq (vancomycin hydrochloride for oral solution) is an antibacterial used for the treatment of Clostridium difficile-associated diarrhea and enterocolitis caused by Staphylococcus aureus (including methicillin-resistant strains) in adults and pediatric patients.

    Fact Table






    less than 10%

    Legal status


    Chemical Name

    Vancomycin HCL

    Elimination half-life

    4 to 6 hours

    Dosage (Strength)

    25 mg/ml, 50 mg/ml


    not recommended



    Protein binding


    PubChem CID






    ATC code






    Routes of administration



    Each kit of Firvanq consists of vancomycin hydrochloride USP, powder for oral solution, equivalent to 3.75 grams or 7.5 grams or 15.0 grams vancomycin, and grape-flavored diluent.

    Clostridium difficile-associated diarrhea:

    • Adults (18 years and older): 125 mg by mouth four times daily for 10 days
    • Pediatrics (less than 18 years old): 40 mg per kg by mouth in 3 or 4 divided doses for 7 to 10 days. Do not exceed 2,000 mg daily. 

    Enterocolitis caused by Staphylococcus aureus:

    • Adults (18 years and older): 500 mg to 2,000 mg by mouth in 3 or 4 divided doses for 7 to 10 days.
    • Pediatrics (less than 18 years old): 40 mg per kg by mouth in 3 or 4 divided doses for 7 to 10 days. Do not exceed 2,000 mg daily.

    Shake Firvanq oral solution well before each dose. Use a measuring device to measure out the appropriate dose (in milliliters). Store Firvanq in the refrigerator. Discard Firvanq after 14 days or if it looks cloudy or has particulates. 


    The active ingredient in Firvanq is Vancomycin Hydrochloride.


    Discuss your allergies with your doctor. Do not take Firvanq if you are allergic to vancomycin or any of the other ingredients in Firvanq.


    • Discuss all your medications with your doctor, including all prescription, over-the-counter, vitamins, and herbal supplements.
    • Serum levels of vancomycin may increase while taking Firvanq. Serum levels may be monitored.
    • Firvanq can cause kidney damage. Kidney function should be monitored.
    • Firvanq may cause hearing problems.
    • Firvanq may cause severe skin reactions such as rashes, lesions, or blisters.
    • Tell your doctor if you are pregnant or plan to become pregnant.
    • Tell your doctor if you are breastfeeding or plan to breastfeed.

    Side Effects

    The most common side effects associated with Firvanq include nausea, upset stomach, and low potassium levels. These are not all the possible side effects. Tell your doctor right away if you develop side effects that are bothersome or won't go away.


    Firvanq Prescribing Information. Wilmington, MA: azurity pharmaceuticals.

    Frequently Asked Questions about Firvanq (Vancomycin Hydrochloride)

    What is Firvanq used for?

    Firvanq is an antibiotic used to treat two specific infections: Clostridium difficile-associated diarrhea (C. Diff) and staphylococcal enterocolitis.

    How is Firvanq taken?

    Firvanq comes as a powder that you mix with a provided grape-flavored liquid to make an oral solution. It's usually taken 3-4 times a day for 7-10 days.

    What is the dosage of Firvanq?

    The dosage depends on your weight and condition. Typically, it's 40 milligrams per kilogram of body weight, divided into 3-4 doses, but shouldn't exceed 2 grams per day.

    Does Firvanq have side effects?

    Yes, common side effects include nausea, vomiting, diarrhea, stomach pain, and headache. More serious side effects are rare but possible.

    Is Firvanq safe for everyone?

    No, Firvanq shouldn't be used if you're allergic to vancomycin or have severe kidney problems. Tell your doctor about any allergies or health conditions before taking it.

    Can I take Firvanq with other medications?

    Tell your doctor about all medications you're taking, including supplements, as some may interact with Firvanq.

    What if I miss a dose of Firvanq?

    Take the missed dose as soon as possible, but skip it if it's near time for your next dose. Don't double up on doses.

    Can I drink alcohol while taking Firvanq?

    It's best to avoid alcohol while taking Firvanq as it can increase the risk of side effects.

    How long does it take for Firvanq to work?

    You may start feeling better within a few days, but it's important to finish the entire course of treatment even if you feel better.

    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 : 13580

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