Mucinex (Guaifenesin) – Oral

What Is Mucinex ?

Mucinex ( guaifenesin ) is an over-the-counter ( OTC ) medicine used to help relieve chest congestion from a cold or influenza .

Mucinex belongs to a group of drugs called expectorants. Expectorants make it easier for you to cough up phlegm by loosening and thinning the mucus in your lungs.

Mucinex is available in several unlike nonprescription preparations, including tablets, liquids, and dissolving granules. several OTC cough and cold combination products besides contain guaifenesin as an ingredient .

Drug Facts

Generic Name: Guaifenesin Brand Name: Mucinex Drug Availability: Over the counterpunch Therapeutic Classification: Expectorant
Available Generically: yes Controlled Substance: N/A Administration Route: Oral Active Ingredient: Guaifenesin Dosage Form(s): Tablet, extended-release pad, solution, syrup, liquid, mailboat

What Is Mucinex Used For ?

The Food and Drug Administration ( FDA ) approved Mucinex to help loosen mucus ( languor ) and thin lung secretions, making it easier for you to cough up mucus and clear your lungs .

Mucinex is much used to improve symptoms of the common cold and other acute accent lung infections, but it wo n’t treat your cold or help you recover any fast .

Mucinex (Guaifenesin) Drug Information - Illustration by Zoe Hansen
Verywell / Zoe Hansen

How to Take Mucinex

Mucinex comes in many different formulations, including extended-release ( ER ) tablets, liquids, and dissolving granules. It ’ mho authoritative to follow the instructions on the package carefully to ensure you ’ re taking the discipline measure .

Guaifenesin is present in many combination cough and cold products. Always review the number of active ingredients of all medicines you are using to ensure guaifenesin is not present in more than one intersection .

You can take Mucinex with or without food, but taking it with food can help if it causes an disturbance abdomen. Mucinex tablets should be taken with a wax glass of water. Staying well-hydrated help all Mucinex products work. by and large, aim to drink at least eight 8-ounce glasses of water. Try to stick to non-caffeinated drinks .

If you ’ re using the Mucinex ER tablets, swallow them unharmed, without crushing, chewing, or breaking them .

If you ’ re using the dissolving granules, empty the packet onto your tongue and swallow. Try not to chew the granules to avoid an unpleasant taste .


You can store Mucinex at board temperature. Keep Mucinex and all your medications in a safe location, off from children and pets .

Off-Label Uses

Your healthcare provider may prescribe Mucinex to help with chest congestion for conditions not intended to be treated by the product, including lung diseases like chronic bronchitis. If you have a chronic lung circumstance, lone function Mucinex if your supplier recommends it .

How Long Does Mucinex Take to Work?

Mucinex should begin to work the first day you start using it. Let your healthcare supplier know if your symptoms seaport ’ triiodothyronine improved within seven days or if you have a senior high school fever, foolhardy, or headache that doesn ’ metric ton go away.

What Are the Side Effects of Mucinex ?

This is not a complete list of side effects and others may occur. A aesculapian professional can advise you on side effects. If you experience other effects, contact your pharmacist or a checkup professional. You may report english effects to the FDA at or 800-FDA-1088.

coarse Side Effects

Most people don ’ metric ton have any slope effects while taking Mucinex, but let your healthcare supplier know if you develop any reactions, including :

  • Headache
  • Nausea 
  • Vomiting

austere Side Effects

rarely, Mucinex may cause hard side effects. Call your healthcare provider justly away if you develop any hard symptoms. Call 911 if you think you are having a dangerous reaction.

Mucinex may cause an allergic reaction that can sometimes be serious. Contact your supplier correct away if you develop :

  • Hives 
  • Itchy, red, swollen, blistered, or peeling skin 
  • Rash 
  • Swelling of the mouth, face, lips, tongue, or throat 
  • Tightness in the chest or throat
  • Trouble breathing, talking, or swallowing 
  • Unusual hoarseness 
  • Wheezing

Report Side Effects

Mucinex may cause other side effects. Call your healthcare supplier if you have any unusual problems while taking this medication .
If you experience a serious side effect, you or your supplier may send a report to the FDA ‘s MedWatch Adverse Event Reporting Program or by call ( 800-332-1088 ) .
( 800 ) 332-1088

dose : How much Mucinex Should I Take ?

Drug Content Provided and Reviewed by

IBM Micromedex


The acid of this medicine will be different for different patients. Follow your repair ‘s orders or the directions on the label. The follow information includes only the average doses of this medicate. If your dose is different, do not change it unless your sophisticate tells you to do so .
The total of medicine that you take depends on the strength of the medicate. besides, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine count on the checkup problem for which you are using the medicine .

  • For regular (short-acting) oral dosage forms (capsules, oral solution, syrup, or tablets):

    • For cough:

      • Adults—200 to 400 milligrams (mg) every four hours.
      • Children 6 to 12 years of age—100 to 200 mg every four hours.
      • Children 4 to 6 years of age—50 to 100 mg every four hours.
      • Children and infants up to 4 years of age—Use is not recommended .
  • For long-acting oral dosage forms (extended-release capsules or tablets):

    • For cough:

      • Adults—600 to 1200 mg every twelve hours.
      • Children 6 to 12 years of age—600 mg every twelve hours.
      • Children 4 to 6 years of age—300 mg every twelve hours.
      • Children and infants up to 4 years of age—Use is not recommended .


Cough and cold combination products, including those containing guaifenesin, the active ingredient in Mucinex, can cause dangerous reactions and death in young children. Do not use these products in children younger than 4 years old.

For children over 4 years, be certain you select a children ’ mho product approved for the child ’ south age ( this information will be on the packaging ). Read the instructions cautiously to ensure you give the right dose for the child ’ mho old age and weight. Never use an adult product on a child. If you have any questions about choosing a product or how much to give, ask a baby doctor or pharmacist .

Missed Dose

Mucinex is typically taken as needed, meaning merely when you have symptoms. If your healthcare provider has told you to take Mucinex regularly, take your missed dose arsenic soon as you remember. If it ’ sulfur about prison term for your future acid, skip the missed dose and resume your normal dose schedule. Don ’ triiodothyronine double up or take supernumerary Mucinex .

overdose : What Happens If I Take excessively much Mucinex ?

There is limited information regarding the effects of a Mucinex overdose, though it is not expected to cause austere symptoms. high gear doses of Mucinex may cause nausea and vomit. Taking high doses of Mucinex for a long time can besides cause kidney stones .

What Happens If I Overdose on Mucinex?

If you think you or person else may have overdosed on Mucinex, call a healthcare supplier or the Poison Control Center ( 800-222-1222 ). If person collapses or is n’t breathing after taking Mucinex, call 911 immediately .


Drug Content Provided and Reviewed by

IBM Micromedex


If your cough has not improved after 7 days or if you have a fever, skin foolhardy, continuing concern, or sore throat with the cough, check with your doctor. These signs may mean that you have other medical problems .

What Are Reasons I Shouldn ’ t Take Mucinex ?

Do not take Mucinex if you are allergic to guaifenesin or any early component included in the combination products. Always check the number of active ingredients on the box to ensure the merchandise does not contain a medicine you are allergic to .

Do not use these products in children younger than 4 years old .

What early Medications Interact With Mucinex ?

Mucinex may interact with other medications you take. Always keep an update list of all your medicines, including OTC products, and share this information with your healthcare provider anytime there are changes.

Certain liquid forms of Mucinex contain alcohol. Avoid using these products with the be medications since unpleasant and sometimes good reactions may result :

  • Antabuse (disulfiram)
  • Solosec (secnidazole)

This is not a complete list of all the drugs that may interact with Mucinex. Always ask your supplier before starting anything new .

Frequently Asked Questions

  • What is Mucinex used for?

    Mucinex is used to improve chest congestion caused by colds and acute lung infections .

  • How does Mucinex work?

    Mucinex is an expectorant and works by thinning lung secretions and loosening mucus ( emotionlessness ). This makes it easier for you to cough up mucus and clear your lungs .

  • When should you see your healthcare provider?

    Call your provider if your symptoms don ’ thyroxine improve within seven days or you have a high fever, foolhardy, or concern that does not go aside. Don ’ t take Mucinex for a chronic lung condition ( such as asthma or chronic clogging pneumonic disease, or COPD ) unless your provider recommends it .

How Can I Stay Healthy While Taking Mucinex ?

If you find yourself searching the shelves at the drugstore looking for something to relieve your cold symptoms, Mucinex may be one merchandise that can help. Just remember, Mucinex won ’ thymine treat your cold or avail you get better any flying. Getting plenty of rest and staying hydrated is key .

other remedies, such as using a humidifier or saline adenoidal irrigation, can besides help relieve symptoms of congestion .

If you ’ re still not feeling yourself after seven days or if you have a eminent fever, foolhardy, or headache that doesn ’ thyroxine go away, be sure to see your healthcare supplier. These could be symptoms of another condition that requires treatment.

Medical Disclaimer

Verywell Health ‘s drug information is meant for educational purposes only and is not intended as a successor for medical advice, diagnosis, or treatment from a healthcare professional. Consult your doctor before taking any new medication ( second ). IBM Watson Micromedex provides some of the drug contentedness, as indicated on the page .

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