As of 2015, some cough syrups containing guaifenesin include Tussin, Mucinex, Robafen and Robitussin Chest Congestion, states Drugs.com. Cough syrups such as Mucinex Sinus-Max Day and Night and Mucinex Sinus-Max Pressure and Pain combine guaifenesin with ingredients such as acetaminophen and phenylephrine to relieve both cough and nasal congestion.
Products containing guaifenesin are classified as expectorants, according to Drugs.com. Guaifenesin facilitates coughing up mucus and clearing the air passages by making the mucus in the airways thinner, explains MedlinePlus. In addition to using guaifenesin to help patients with coughing, doctors use it to relieve symptoms of bronchiectasis, fibromyalgia and bronchitis, according to Drugs.com. Patients using guaifenesin may experience side effects such as nausea, vomiting and headaches, notes MedlinePlus.