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.

Lorzone (Chlorzoxazone)


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Generic Equivalent - Lorzone (Chlorzoxazone)

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  • Product Details


    Lorzone (chlorzoxazone) is a medication that is used with rest, physical therapy, and other regimens to treat the sudden onset of musculoskeletal pain. Lorzone is not a narcotic.

    Fact Table




    US DailyMed


    Well absorbed

    Legal status


    Chemical Name


    Elimination half-life

    1.1 hr Duration of action 3-4 hrs

    Dosage (Strength)

    375mg, 500mg, 750mg


    Consult Doctor



    Protein binding


    PubChem CID






    ATC code






    Routes of administration

    By mouth


    Lorzone is available in 250 mg, 375 mg, 500 mg, and 750 mg tablets.

    The typical starting dose is 250 mg to 500 mg by mouth three to four times a day. 


    The active ingredient in Lorzone is chlorzoxazone. 


    Discuss your allergies with your doctor. Do not take Lorzone if you are allergic to chlorzoxazone or any other ingredient in Lorzone.


    • Lorzone may interact with certain medications. Tell your doctor about all the medications you take. These include prescription and over-the-counter medications as well as vitamins and herbal supplements.
    • Tell your doctor about your health conditions.
    • Lorzone can cause liver problems. Drinking alcohol or taking other medications that can cause central nervous system depression while being treated with Lorzone can further increase the risk.
    • Tell your doctor if you are pregnant or plan to become pregnant.
    • Tell your doctor if you are currently breastfeeding or plan to breastfeed.

    Side Effects

    Lorzone is generally tolerated well but can cause side effects such as drowsiness, dizziness, lightheadedness, overstimulation, gastrointestinal bleeding, or a feeling of general discomfort. Tell your doctor if you experience side effects that bother you or will not go away. 


    1. Lorzone Prescribing Information. Bridgewater, NJ: Vertical Pharmaceuticals, LLC; 2017. 
    2. Chlorzoxazone (Lorzone). GoodRx. Last reviewed December 20, 2021. Accessed February 4, 2022.

    Frequently Asked Questions about Lorzone (Chlorzoxazone)

    What is Lorzone used for?

    Lorzone is a muscle relaxant used to relieve pain and stiffness caused by muscle spasms. It's often used for conditions like back pain, neck pain, and pain from injuries.

    How do I take Lorzone?

    Take it by mouth, with or without food, as directed by your doctor. Don't take more than the prescribed dose or take it more often than advised.

    What is the usual dosage?

    The typical adult dose is 375mg three or four times daily. However, your doctor may adjust the dose based on your needs.

    Can I take Lorzone with other medications?

    Tell your doctor about all medications you're taking, including over-the-counter drugs and supplements. Some medicines can interact with Lorzone, increasing side effects.

    Does Lorzone have side effects?

    Yes, common side effects include drowsiness, dizziness, and headache. Less common, but serious, side effects can occur. Consult your doctor if you experience unusual symptoms.

    Is Lorzone safe for everyone?

    Tell your doctor about any existing medical conditions, especially liver disease, before taking Lorzone. It may not be suitable for everyone.

    Is Lorzone addictive?

    No, Lorzone is not considered addictive. However, it's important to follow your doctor's instructions and not take it for longer than recommended.

    Can I drink alcohol while taking Lorzone?

    Avoid alcohol while on Lorzone, as it can worsen drowsiness and dizziness.

    Can I drive or operate machinery while taking Lorzone?

    Use caution, as Lorzone can cause drowsiness and dizziness. Wait until you know how it affects you before engaging in activities requiring alertness.

    What should I do if I miss a dose?

    Take the missed dose as soon as possible, unless it's near the time for your next dose. Do not double up on doses.

    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 : 13597

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