An expectorant found by itself and in many combination cold and cough products, such as Mucinex® and Robitussin®, guaifenesin comes in both syrup and tablet forms. The drug works by thinning bronchial secretions such as phlegm, making them easier to "cough up." It is approved primarily for adults and children over the age of 12, but may be given to children between the ages of 4 and 12 if the child's healthcare provider approves.
In general, this medication is taken every 4 to 12 hours, but this will depend on whether the tablet or syrup form of guaifenesin is used, as well as the person's age, weight, and if other drugs are also being taken. People who should avoid alcohol may need to avoid guaifenesin as well, especially if it is packaged as a combination cold and cough product, since these often contain alcohol.
(Click Guaifenesin to learn more about both syrup and tablet forms of this drug, including possible side effects, important safety precautions, and what to do in case of overdose.)