Chlorpheniramine / dextromethorphan / methscopolamine Side Effects
Ocular side effects have included mydriasis, diplopia, and blurred vision.[Ref]
Musculoskeletal side effects have included arthralgia and weakness.[Ref]
Renal side effects have included polyuria.[Ref]
1. "Product Information. Extendryl DM (chlorpheniramine/DM/methscopolamine)." Aura Laboratories, Fort Lauderdale, FL.
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Some side effects may not be reported. You may report them to the FDA.