Guaifenesin is an over-the-counter medication commonly used as an expectorant. It helps loosen mucus in the airways, making it easier to cough up and clear out. This can provide relief from symptoms associated with colds, bronchitis, and other respiratory conditions. Typically found in cough syrups and tablets, Guaifenesin is often combined with other ingredients to enhance its effectiveness. It is important to stay hydrated while using this medication, as fluids can further help thin mucus. Always follow the dosage instructions on the label or as directed by a healthcare professional.