Guaifenesin is an over-the-counter medication widely used to alleviate chest congestion. It functions as an expectorant, thinning and loosening mucus in the airways to make coughs more productive and help clear phlegm. It is commonly found in various cough and cold products, available as tablets, extended-release tablets, and liquids.
Guaifenesin and Diarrhea
Guaifenesin can cause diarrhea, though it is not a common side effect. This gastrointestinal effect may occur because guaifenesin, when taken orally, is well absorbed along the digestive tract. While the exact mechanism is not fully understood, it may irritate the digestive tract or increase gastric secretions, contributing to looser stools.
Diarrhea caused by guaifenesin is typically mild and often resolves once the medication is stopped. However, some individuals have reported severe cramping, vomiting, and diarrhea, particularly with higher doses. If you experience diarrhea while taking guaifenesin, it is advisable to increase fluid intake to prevent dehydration.
Other Potential Side Effects
While generally well-tolerated, guaifenesin can lead to other side effects. Common reactions include nausea, vomiting, stomach pain, and dizziness. Nausea and vomiting, along with abdominal discomfort, are frequently reported gastrointestinal issues. These symptoms are usually mild and may subside as the body adjusts to the medication.
Headaches and skin rashes are also potential side effects of guaifenesin. Rarely, hives may develop. Some individuals might experience drowsiness or light-headedness. If you encounter dizziness, it is advisable to avoid driving or operating heavy machinery until you understand how the medication affects you.
When to Seek Medical Advice
Seek medical advice if you experience certain symptoms while taking guaifenesin. If diarrhea is severe, persistent, or accompanied by intense abdominal pain, medical attention is warranted. Signs of dehydration, such as decreased urination, dry mouth, excessive thirst, dizziness, or lightheadedness, also indicate a need for professional evaluation.
Contact a healthcare provider if you notice blood in your stool. If you develop symptoms of an allergic reaction, such as a rash, itching, hives, swelling of the face, lips, tongue, or throat, or difficulty breathing, seek immediate medical help. If your cough persists for more than seven days, returns after clearing, or is accompanied by a fever, rash, or a headache that does not improve, these could indicate a more serious underlying illness.