Drink plenty of extra fluids while you are taking this medication. Do not crush or chew the tablets. Swallow them whole or break them in half where they are scored to make them easier to swallow. Guaifenesin is an expectorant. It is used to break up congestion and mucous to help you breathe more easily.
Phenylephrine is a decongestant.
Phenylephrine helps to open airways and decrease the amount of fluid in your respiratory tract to make it easier for you to breathe. Guaifenesin and phenylephrine is used to treat the symptoms of the common cold and of infections of your sinuses, your lungs, and your throat. Guaifenesin and phenylephrine may also be used for purposes other than those listed in this medication guide. A very serious drug interaction could occur, leading to serious side effects. You may not be able to take guaifenesin and phenylephrine, or you may require a lower dose or special monitoring during treatment if you have any of the conditions listed above.