Mucinex (Guaifenesin)

Mucinex (Guaifenesin) is an over-the-counter medication used to reduce chest congestion caused by common colds, allergies, bronchitis, and other breathing illnesses, making coughing out through your mouth easier. Chest congestion results in thick and dense mucus buildup in the lungs which can be difficult to get out through coughing. The active ingredient in Mucinex is Guaifenesin. Guaifenesin belongs to a class of drugs called expectorants. It works by thinning and loosening mucus in the airways, clearing congestion, and making breathing easier. Mucinex will not work for ongoing chest congestion from smoking or long-term breathing problems.

Manufacturer Information

Get medical help immediately if you have any of these signs or an allergic reaction while taking Mucinex. The most common side effects of Mucinex may include the following:
• Dizziness;
• Headache;
• Nausea;
• Stomach upset

Contact your doctor right away if you have any of the severe side effects, including:
• Symptoms of an allergic reaction like breathing difficulties, hives, or swelling of face, lips, tongue, or throat;
• Worsening of your condition

These are not all of the side effects of Mucinex. Always contact your doctor if you notice any unusual symptoms.

You should not take Mucinex if you are allergic to Guaifenesin or any ingredient in Mucinex. Before you start using this medication, tell your doctor about your medical history, especially if you:
• Are breastfeeding or planning to breastfeed;
• Are pregnant or planning to be pregnant;
• Have breathing problems like asthma, emphysema, or chronic bronchitis;
• Have ever had a cough that occurs with a large amount of phlegm

Tell your doctor about all your medications, including prescription, OTC, herbal supplements, and vitamins. There may be drug interactions between Mucinex and caffeine, imipramine, phenelzine, methylphenidate, phentermine, etc. Tell your doctor if you are pregnant or planning to become pregnant. It is not known if Mucinex will harm a fetus. Inform your doctor if you are breastfeeding or planning to breastfeed. It is unknown if Mucinex passes into breast milk and if it may harm nursing infants. Take Mucinex precisely as prescribed by your doctor. Use the drug with food if it upsets your stomach. Swallow the tablet whole with a full glass of water. Do not break, crush, or chew. Drink extra fluids to help loosen the congestion and lubricate your throat. Mucinex may make you dizzy. Avoid driving or activities that require you to be alert. Inform your doctor if there is no improvement in your condition despite regular use. Keep this medicine in its original container out of sight and reach of children. Store at room temperature, away from excess heat and moisture.

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