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)


Mucinex (Guaifenesin)


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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




    US FDA



    Legal status

    RX Only

    Chemical Name


    Elimination half-life

    1–5 hours

    Dosage (Strength)

    600mg (20 tablets), 1200mg (14 tablets)


    Consult a doctor



    Protein binding


    PubChem CID






    ATC code

    R05CA03, QM03BX90





    Routes of administration



    • 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

    Frequently Asked Questions about Mucinex (Guaifenesin)

    What is Mucinex (Guaifenesin)?

    Mucinex is an over-the-counter medication containing the active ingredient Guaifenesin, which is an expectorant. It helps to loosen and thin mucus in the airways, making it easier to cough up.

    How does Mucinex work?

    Mucinex works by increasing the volume of bronchial secretions and reducing the viscosity or stickiness of the mucus. This helps in clearing the airways and makes coughing more productive.

    How should I take Mucinex?

    Always follow the directions on the label or as prescribed by your doctor. Typically, it is taken orally with a full glass of water.

    Are there any side effects associated with Mucinex?

    Common side effects may include stomach upset, dizziness, or headache. If you experience severe side effects or an allergic reaction, seek medical attention immediately.

    Can I take Mucinex if I'm pregnant or breastfeeding?

    Consult with your healthcare provider before taking Mucinex if you are pregnant, planning to become pregnant, or breastfeeding.

    Can children take Mucinex?

    There are pediatric formulations of Mucinex available. Always consult with a pediatrician before giving any medication to children.

    Can I take Mucinex with other medications?

    It's essential to inform your doctor or pharmacist about all the medications you're currently taking, including prescription, over-the-counter, vitamins, and herbal supplements, to ensure there are no interactions.

    How long can I take Mucinex?

    Do not take Mucinex for longer than recommended on the label or by your doctor. If your symptoms persist or worsen, consult with a healthcare professional.

    Is it safe to consume alcohol while taking Mucinex?

    It's best to avoid alcohol while taking Mucinex as it can increase the risk of dizziness and drowsiness.

    What should I do if I miss a dose?

    If you miss a dose, take it as soon as you remember. If it's close to the time for your next dose, skip the missed dose and continue with your regular schedule. 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 : 5914

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