Mucinex, or guaifenesin, is an over-the-counter expectorant that relieves chest congestion typically associated with a cold, allergy, or flu-like condition by loosening up mucus that then can be coughed up and expelled from the lungs. Mucinex aids in clearing chest stuffiness and improves breathing. Extra fluids are recommended with this medication since the extra fluid will help break up the congestion and keep the throat from getting dry or sore during excessive episodes of coughing. As with any medication, some uncomfortable or negative side effects may occur with Mucinex.
Respiratory
Mucinex is for the purpose of alleviating congestion, therefore a productive cough may be experienced. Also, throat irritation may occur as phlegm loosens and material is coughed up from the sinuses and the lungs.
Gastrointestinal
Several mild side effects have been reported by individuals while taking Mucinex. This group of common side effects includes an upset stomach with diarrhea as well as possible nausea and vomiting. Some abdominal pain also may be experienced.
Headaches
Headaches and dizziness have been reported by patients taking Mucinex Lying down may improve this symptom.
Other
Side effects of increasing severity also have been reported from taking this medication. For example, hypertension and an increased heartbeat have been experienced. Other serious effects include those symptoms indicative of an allergic reaction, such as hives and rash, breathing problems and chest tightness. Swelling about the face, including the areas of the mouth, lips, and tongue may occur, which also are indicative of an allergic reaction. Medical care should be sought immediately if any of these symptoms appear after taking Mucinex.
