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Alahist DM Side Effects

Generic name: dextromethorphan / pheniramine / phenylephrine

Medically reviewed by Drugs.com. Last updated on Apr 17, 2022.

Note: This document contains side effect information about dextromethorphan / pheniramine / phenylephrine. Some dosage forms listed on this page may not apply to the brand name Alahist DM.

Applies to dextromethorphan / pheniramine / phenylephrine: oral liquid.

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:

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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Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.