Do not take this medicine with any of the following medications:
-any stimulant medication
-bromocriptine
-ergot medications for headaches or some procedures
-MAOIs like Carbex, Eldepryl, Marplan, Nardil, and Parnate
-procarbazine

This medicine may also interact with the following medications:
-indomethacin
-mecamylamine
-medicines for chest pain, heart disease, high blood pressure, or heart rhythm problems
-medicines for depression or other mental disturbances
-methyldopa
-other medicines for allergies or colds
-reserpine
-some medicines used during surgery

They need to know if you have any of the following conditions:
-blood vessel disease
-diabetes
-fever
-glaucoma
-heart disease or heart rhythm problems
-high blood pressure
-other chronic disease
-prostate trouble
-taken an MAOI like Carbex, Eldepryl, Marplan, Nardil, or Parnate within the last 14 days
-thyroid disease
-an unusual or allergic reaction to guaifenesin, phenylephrine, other medicines, foods, dyes, or preservatives
-pregnant or trying to get pregnant
-breast-feeding

Tell your doctor or health care professional if your symptoms do not improve within 5 days or if they get worse. If you have trouble falling asleep at night, take the last dose of the day at least a few hours before bedtime.

Drink 6 to 8 glasses water daily while you are taking this medicine to help loosen mucus.

Keep out of the reach of children.

Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Protect from light and moisture. Throw away any unused medicine after the expiration date.