Guaifenesin with phenylephrine is used for the symptomatic relief of a respiratory condition characterized by a stuffy nose, mucous in the respiratory tract, and dry, nonproductive cough caused by colds, flu, or hay fever. Inform your physician if you are pregnant or nursing. Inform your physician or pharmacist if you have high blood pressure, diabetes, glaucoma, heart disease, or an overactive thyroid. Do not take diet pills while taking this medication. Do not take this medication with a monoamine oxidase inhibitor. This medication may be taken with or without food. Drink a glass of water with each dose. Guaifenesin with phenylephrine may cause trouble sleeping; take your last dose of the day several hours before bedtime. Notify your physician if you develop trouble breathing or a fast, pounding or irregular heart beat. Notify your physician if your cough lasts for more than one week.

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