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Extendryl DM Side Effects

Generic Name: chlorpheniramine / dextromethorphan / methscopolamine

Note: This page contains information about the side effects of chlorpheniramine / dextromethorphan / methscopolamine. Some of the dosage forms included on this document 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.

Not all side effects for Extendryl DM may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

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