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DEXTROMETHORPHAN; GUAIFENESIN; PHENYLEPHRINE (dex troe meth OR fan; gwye FEN e sin; fen il EF rin) is a combination of a cough suppressant, an expectorant, and a decongestant. It is used to treat cough and congestion. This medicine will not treat an infection.
Take this medicine by mouth. Follow the directions on the prescription label. Shake well before using. Take with food or milk. Use a specially marked spoon or container to measure your dose. Household spoons are not accurate. Take your medicine at regular intervals. Do not take it more often than directed.
Talk to your pediatrician regarding the use of this medicine in children. While this drug may be prescribed for children as young as 6 years old for selected conditions, precautions do apply.
Patients over 60 years old may have a stronger reaction and need a smaller dose.
Side effects that you should report to your doctor or health care professional as soon as possible:
allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
anxiety, irritable, or excited
fast, irregular heartbeat
unusually weak or tired
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
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:
barbiturates like phenobarbital
certain heart medicines like metoprolol, digoxin, and methyldopa
medicines for depression, anxiety, or psychotic disturbances
medicines for sleep
medicines to treat blood pressure
other medicines for cold, cough, or allergy
some medicines used for sleep during surgery
If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.
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.
They need to know if you have any of these conditions:
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
an unusual or allergic reaction to dextromethorphan, guaifenesin, phenylephrine, other medicines, foods, dyes, or preservatives
pregnant or trying to get pregnant
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.
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