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.

Mucinex (Guaifenesin Extended-Release)


Mucinex (Guaifenesin Extended-Release)


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  • Product Details


    Mucinex (guaifenesin) is a drug used to help with chest congestion and cough. It works by breaking up mucus in your airways and allowing it to be coughed up more easily. You can buy Mucinex as 600mg or 1200mg tablets. The tablets have an extended-releasing coating on them to allow the drug to be taken less frequently. You should store your Mucinex tablets at room temperature and keep them out of reach of children.


    • Swallow the tablets whole. Do not crush or chew them.
    • Take Mucinex with plenty of water.
    • Mucinex can be taken on an empty stomach or with a meal.
    • Mucinex Dosage:
      • Take 600mg – 1200mg every 12 hours. Do not exceed 2400mg per day.


    The active ingredient in Mucinex is guaifenesin. For a full list of inactive ingredients, see the package insert.

    Fact Table
    Formula C10H14O4
    License US FDA
    Routes of administration By mouth (tablet)
    Legal status US: OTC
    Chemical Name Guaifenesin
    Elimination half-life 1-5 hours
    Dosage (Strength) 600mg, 1200mg
    Pregnancy Risk not ruled out
    Brands Mucinex
    Protein binding -
    PubChem CID 3516
    MedlinePlus a682494
    ChEBI 5551
    ATC code R05CA03, QM03BX90
    DrugBank DB00874
    KEGG D00337
    Bioavailability -


    • Mucinex extended-release tablets are not for children under 12. Your physician or pharmacist can recommend alternatives for children.
    • Coughs that last for more than seven days may require help from your physician.
    • Using Mucinex during pregnancy may have associated risks. Consult with your doctor before starting Mucinex if you are pregnant or plan to become pregnant.

    Side Effects

    Mucinex has relatively few side effects. The most common side effects are nausea and vomiting.

    Other Considerations

    • Mucinex is available in a variety of formulations. You can also buy Mucinex in combination with other drugs. Consult your physician or pharmacist if you have questions about combination products.
      • If you are currently using an MAOI drug, avoid Mucinex products that contain dextromethorphan.
      • If you have any of the following conditions, avoid using Mucinex products that contain phenylephrine:
        • Cardiac Disorders
        • Diabetes
        • High blood pressure
        • Prostatic Hypertrophy
        • Glaucoma
      • If you know someone who may be interested in buying Mucinex, click here to learn about Canada Pharmacy’s referral program.


    1. DailyMed - MUCINEX- guaifenesin tablet, extended release. (2019). Retrieved March 22, 2020
    2. Guaifenesin. (n.d.). Retrieved March 22, 2020

    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 : 5914

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