People who experience chronic cough congestion and symptoms may feel better after taking a dose of Mucinex. Mucinex is a medication available over-the-counter that contains guaifenesin, an expectorant, and helps clear sticky mucus from the airways to allow oxygen to reach the lungs more easily. It is important to be aware of the side effects of this medication before taking it.
Skin Rash
People who use this medication can develop a skin rash as a side effect of treatment, Drugs.com reports. A skin rash is a patch of discolored skin that usually appears red or inflamed. Once Mucinex is discontinued, this side effect typically resolves completely.
Headache
Treatment with guaifenesin can cause headache pain in certain people, PubMed Health warns. Sensations of pain can extend to any region of the head and may disrupt a person's ability to concentrate or think clearly while at work or school. If headache pain is bothersome, people can take pain medication, such as acetaminophen, to alleviate headache discomfort.
Dizziness
Unusual sensations of dizziness can arise when taking this medication. Dizziness may cause people to feel unbalanced or unstable while walking or standing. Such side effects can increase the risk of tripping or falling down, making it important for affected people to remain seated until dizziness episodes pass. Due to these side effects, people should also use caution while driving or participating in potentially hazardous activities after taking guaifenesin, Drugs.com advises.
Upset Stomach
Mucinex can cause upset stomach side effects in certain people. These stomach-related symptoms typically include nausea or vomiting, MedlinePlus explains. People who develop stomach discomfort can also experience a temporary loss of appetite. Not taking guaifenesin on an empty stomach can help limit the development of these side effects.
