Highlights for dextromethorphan
dextromethorphan Side Effects
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
- breathing problems
- excitement, nervousness, restlessness, or irritability
- slurred speech
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
- stomach upset
dextromethorphan May Interact with Other Medications
Do not take this medicine with any of the following medications:
- MAOIs like Carbex, Eldepryl, Marplan, Nardil, and Parnate
This medicine may also interact with the following medications:
- medicines for depression, anxiety, or psychotic disturbances
- other medicines for allergies or cold
How to Use dextromethorphan
Take this medicine by mouth. Follow the directions on the prescription label. Use a specially marked spoon or container to measure each dose. Ask your pharmacist if you do not have one. 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 2 years old for selected conditions, precautions do apply.
They need to know if you have any of these conditions:
- large amount of mucus
- liver disease
- an unusual or allergic reaction to dextromethorphan, other medicines, bromides, foods, dyes, or preservatives
- pregnant or trying to get pregnant
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.
Do not treat yourself for a cough for more than 1 week without consulting your doctor or health care professional. If you have a high fever, skin rash, lasting headache, or sore throat, see your doctor.
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 20 and 25 degrees C (68 and 77 degrees F) unless otherwise directed. Protect from light. Do not freeze. Throw away any unused medicine after the expiration date.
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Last Updated: April 17, 2009