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Extendryl DM Side Effects

Generic Name: chlorpheniramine / dextromethorphan / methscopolamine

Note: This document contains side effect information about chlorpheniramine / dextromethorphan / methscopolamine. Some of the dosage forms listed on this page may not apply to the brand name Extendryl DM.

Applies to chlorpheniramine / dextromethorphan / methscopolamine: oral tablet extended release


Cardiovascular side effects have included bradycardia, tachycardia, flushing, and, palpitations.[Ref]


Gastrointestinal side effects have included nausea, xerostomia, diarrhea, abdominal pain, appetite increase, weight gain, constipation, and dysphagia.[Ref]


Ocular side effects have included mydriasis, diplopia, and blurred vision.[Ref]


Musculoskeletal side effects have included arthralgia and weakness.[Ref]

Nervous system

Nervous system side effects have included headache, excitability, irritability, fatigue, nervousness, dizziness, drowsiness, confusion, and memory impairment.[Ref]


Genitourinary side effects have included urinary retention.[Ref]


Renal side effects have included polyuria.[Ref]


Respiratory side effects have included pharyngitis.[Ref]


1. "Product Information. Extendryl DM (chlorpheniramine/DM/methscopolamine)." Aura Laboratories, Fort Lauderdale, FL.

Some side effects of Extendryl DM may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.

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