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Guaifenesin Dosage, Mucinex DM, Side Effects & Interactions

Read information about guaifenesin dosage, Mucinex DM: Side effects, uses, doses, warnings, precautions, mechanism of action, contraindications.

Guaifenesin Dosage

Mucinex DM helps to lower the intensity of coughing and the urged cough so you can sleep better. Originally manufactured as a prescription drug. Mucinex DM was switched to over-the-counter (OTC) status in 2014. It is distributed by Reckitt Benckiser in two strengths:

Guaifenesin dosage

  1. Mucinex DM has 30 milligrams of dextromethorphan and 600 milligrams of guaifenesin dosage.
  2. MucinexDM maximum strength has 60 milligrams of dextromethorphan and 1200 milligrams of guaifenesin.
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Cough Suppressant

Mucinex DM is a cough medicine that contains dextromethorphan. A cough suppressant and guaifenesin and expectorant. Hence, this combination of two drugs helps loosen mucus and phlegm and thin out bronchial secretions making coughs more productive.

Mucinex DM for Adults

Tablets are formulated as extended-release which are meant to work for 12 hours. Mucinex DM is for adults and children age 12 years and older. Therefore, any other OTC brands of cough suppressants and expectance containing dextromethorphan and guaifenesin exist including others marketed under the Mucinex brand.

Guaifenesin Dosage for Fibromyalgia

We have a review of a woman with fibromyalgia, who shared her review about guaifenesin dosage on the internet. Hence, you can read what she had to say.

I started at the 600 milligrams and I feel my hip, my left hip, joint a little worse. I’m tired. I feel kind of hot flashes, a little worse. I feel like I am ready for the pain.

FDA Approval

In 2007, the FDA began to take action against companies that marketed drugs containing guaifenesin in time-release formulations that did not have FDA approval. Hence, the FDA took this measure to be sure these products release the active ingredients in a safe manner. However, Mucinex DM tablets have a distinct odor caused by the guaifenesin dosage, the drug maker says.

Mucinex DM warnings

  • You should not take Mucinex DM if you are taking prescription drugs known as monoamine oxidase inhibitors (MAOIs).
  • These include Isocarboxazid (Marplan), Nardil (phenelzine), Parnate (tranylcypromine) and others.
  • You should also not take Mucinex DM if you are on certain other antidepressants or on medication to treat Parkinson’s disease.

Fibromyalgia and Pregnancy

Pregnancy and Mucinex DM

Mucinex DM might cause harm to a developing fetus. If you’re pregnant don’t take Mucinex DM without first asking your doctor. If you are breastfeeding check with your doctor before taking Mucinex DM. According to some unsubstantiated internet reports, a certain number of women to believe that taking Mucinex DM may help them get pregnant.

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Therefore, perhaps by thinning their cervical mucus. It makes it easier for the sperm to swim and meet the egg. On fibromyalgia and pregnancy and fertility websites for consumers, some women claim it helps. However, while others do not think so. However, the evidence appears to be entirely in anecdotal.



This content is strictly an overview and is for informational and educational purposes only. Neither the sources of this content nor the publisher of this content takes responsibility. All readers of this content, especially those taking prescription or over-the-counter medications, should consult their physicians before beginning any medication.


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