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Medications

Dextromethorphan; Guaifenesin capsules and ER tablets

What is this medicine?

DEXTROMETHORPHAN; GUAIFENESIN (dex troe meth OR fan; gwye FEN e sin) is a cough suppressant, expectorant combination. It is used to provide relief from cough. This medicine will not treat an infection.

How should I use this medicine?

Take this medicine by mouth with a full glass of water. Follow the directions on the prescription label. Do not crush or chew. Take your medicine at regular intervals. Do not take your medicine 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 of age for selected conditions, precautions do apply.

What side effects may I notice from receiving this medicine?

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

  • confusion

  • excitement, nervousness, restlessness, or irritability

  • slow or troubled breathing

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

  • headache

  • stomach upset

What may interact with this medicine?

Do not take this medicine with any of the following medications:

  • MAOIs like Carbex, Eldepryl, Marplan, Nardil, and Parnate

  • procarbazine

This medicine may also interact with the following medications:

  • medicines for depression or other mental disturbances

  • other medicines for colds or allergy

What if I miss a dose?

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.

Where should I keep my medicine?

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.

What should I tell my health care provider before I take this medicine?

They need to know if you have any of these conditions:

  • asthma

  • chronic bronchitis

  • emphysema

  • if you have taken an MAOI like Carbex, Eldepryl, Marplan, Nardil, or Parnate in last 14 days

  • kidney or liver disease

  • unable to sit up

  • an unusual or allergic reaction to dextromethorphan, guaifenesin, other medicines, foods, dyes, bromides, or preservatives

  • pregnant or trying to get pregnant

  • breast-feeding

What should I watch for while using this medicine?

Tell your doctor if your symptoms do not improve within 5 days or if they get worse. If you have a high fever, skin rash, lasting headache, or sore throat, see your doctor.

Drink 6 to 8 glasses of water daily while you are taking this medicine to 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.


NOTE:This sheet is a summary. It may not cover all possible information. If you have questions about this medicine, talk to your doctor, pharmacist, or health care provider. Copyright© 2017 Elsevier