Dextromethorphan / Doxylamine / Phenylephrine Side Effects
Applies to dextromethorphan / doxylamine / phenylephrine: oral liquid.
Important warnings
This medicine can cause some serious health issues
Do not use this medicine if you are using or 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, and tranylcypromine.
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 this medicine and call your doctor at once if you have:
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dizziness;
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nervousness; or
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sleep problems (insomnia).
Less serious side effects may be more likely, and you may have none at all.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.
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Further information
Dextromethorphan/doxylamine/phenylephrine side effects can vary depending on the individual. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Note: Medication side effects may be underreported. If you are experiencing side effects that are not listed, submit a report to the FDA by following this guide.