What is the most important information I should know about dextromethorphan?
Do not use this medicine if you have used an MAO inhibitor in the past 14 days, such as isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, or tranylcypromine.
What is dextromethorphan?
Dextromethorphan is a cough suppressant that is used to treat cough caused by the common cold or flu.
Dextromethorphan will not treat a cough caused by smoking, asthma, or emphysema.
There are many brands and forms of dextromethorphan available. Not all brands are listed on this leaflet.
Dextromethorphan may also be used for purposes not listed in this medication guide.
What should I discuss with my healthcare provider before taking dextromethorphan?
Do not use dextromethorphan if you have used an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, tranylcypromine, and others.
You should not use dextromethorphan if you are allergic to it.
Ask a doctor or pharmacist if this medicine is safe to use if you have any medical conditions.
Dextromethorphan should not be given to a child younger than 12 years old.
Ask a doctor before using this medicine if you are pregnant or breast-feeding.
This medicine may contain phenylalanine. Check the medication label if you have phenylketonuria (PKU).
How should I take dextromethorphan?
Use exactly as directed on the label, or as prescribed by your doctor. Cold or cough medicine is only for short-term use until your symptoms clear up.
Measure liquid medicine carefully. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon).
Call your doctor if your symptoms do not improve after 7 days, or if you have a fever, rash, or headaches.
If you need surgery or medical tests, tell your surgeon or doctor ahead of time that you have taken dextromethorphan in the past few days.
Store at room temperature away from moisture, heat, and light. Do not freeze.
What happens if I miss a dose?
Since cough or cold medicine is used when needed, you may not be on a dosing schedule. Skip any missed dose if it's almost time for your next dose. Do not use two doses at one time.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
What should I avoid while taking dextromethorphan?
Avoid driving or hazardous activity until you know how this medicine will affect you. Your reactions could be impaired.
Drinking alcohol can increase certain side effects of this medicine.
Ask a doctor or pharmacist before using over-the-counter medicines that may contain ingredients similar to dextromethorphan.
What are the possible side effects of dextromethorphan?
Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Stop using dextromethorphan and call your doctor at once if you have:
- severe nervousness, confusion;
- severe dizziness or drowsiness;
- blurred vision; or
- painful or difficult urination.
Common side effects may include:
- nausea, diarrhea, loss of appetite;
- tingling; or
- feeling restless.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What other drugs will affect dextromethorphan?
Avoid using this medicine with other drugs that cause drowsiness or slow your breathing (such as opioid medicine, a muscle relaxer, or medicine for anxiety or seizures). Ask a doctor or pharmacist before using any other medication, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed in this medication guide.
Where can I get more information?
Your pharmacist can provide more information about dextromethorphan.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.
Copyright 1996-2023 Cerner Multum, Inc. Version: 8.01. Revision date: 4/22/2019.