Do not take this medicine with any of the following medications:
-ergot alkaloids like dihydroergotamine
-MAOIs like Carbex, Eldepryl, Marplan, Nardil, and Parnate
-stimulant medicines for attention disorders, weight loss, or to stay awake

This medicine may also interact with the following medications:
-alcohol
-barbiturates like phenobarbital
-certain heart medicines like metoprolol, digoxin, and methyldopa
-diuretics
-doxazosin
-medicines for depression, anxiety, or psychotic disturbances
-medicines for sleep
-medicines to treat blood pressure
-muscle relaxers
-other medicines for cold, cough, or allergy
-some medicines used for sleep during surgery
-tamsulosin

They need to know if you have any of these conditions:
-diabetes
-enlarged prostrate
-glaucoma
-heart disease
-high blood pressure
-if you have taken an MAOI like Carbex, Eldepryl, Marplan, Nardil, or Parnate in last 14 days
-lung or breathing disease, like asthma
-thyroid disease
-an unusual or allergic reaction to dextromethorphan, guaifenesin, phenylephrine, other medicines, foods, dyes, or preservatives
-pregnant or trying to get pregnant
-breast-feeding

Talk to your doctor if your cough lasts for more than 1 week. If you have a high fever, skin rash, lasting headache, or sore throat, see your doctor.

Drink several glasses of water each day. This will help loosen mucus.

You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol may interfere with the effect of this medicine. Avoid alcoholic drinks.

Keep out of the reach of children.

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