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.

Buckley's Mucus and Phlegm Relief (Guaifenesin / Menthol)


Buckley's Mucus and Phlegm Relief (Guaifenesin / Menthol)


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  • Product Details


    Buckley's Mucus and Phlegm Relief is an over-the-counter (OTC) medication designed to alleviate the discomfort associated with excessive mucus and phlegm. This medication combines guaifenesin and menthol to provide effective relief from respiratory congestion.

    Buckley's Mucus and Phlegm Relief treats conditions with the symptoms of overproduction of mucus and phlegm, such as the common cold, bronchitis, and respiratory infections. Guaifenesin, the active ingredient, is an expectorant. It thins and loosens mucus in the airways, making it easier to clear by coughing. Menthol provides a soothing effect, alleviating throat irritation and enhancing overall comfort.


    For adults and children over 12, the usual dosage is 2-3 tsp (10-15 mL) every 6 hours as needed. 

    Follow the dosing instructions provided on the packaging, and only take as directed by your doctor.


    The active ingredients are guaifenesin and menthol.


    The most common drug-drug interactions with this drug may include:

    • Alcohol
    • Alprazolam
    • Baclofen
    • Carisoprodol
    • Chlorpheniramine
    • Clonazepam
    • Codeine
    • Cyclobenzaprine
    • Dextromethorphan
    • Diazepam
    • Diphenhydramine
    • Eszopiclone
    • Guaifenesin
    • Hydroxyzine
    • Lorazepam
    • Metaxalone
    • Methocarbamol
    • Midazolam
    • Orphenadrine
    • Phenylephrine
    • Pseudoephedrine
    • Quetiapine
    • Temazepam
    • Tizanidine
    • Zolpidem


    Tell your doctor about all medical conditions before you start taking this drug. Use caution if you have a history of kidney or liver problems. 

    If symptoms persist for over seven days or worsen, visit your doctor. Tell your doctor if you develop a rash or cough up yellow or green mucus.

    Do not use this drug if the security seals are broken on the cap. 

    Keep out of reach of children. This medication is for ages 12 and older.

    Side Effects

    The most common adverse reactions to this drug are:

    • Allergic reactions
    • Diarrhea
    • Dizziness
    • Headache
    • Nausea
    • Skin rash (rare)
    • Upset stomach
    • Vomiting


    Buckley's Mucus and Phlegm [product page]. Mississauga, Ont.: Haleon; 2023.

    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 : 13193

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