Dextromethorphan, guaifenesin, and phenylephrine Side Effects

Please note - some side effects for Dextromethorphan, guaifenesin, and phenylephrine may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.

Side Effects by Body System - for Healthcare Professionals

Applies to: oral capsule; oral liquid; oral suspension, extended release; oral syrup; oral tablet; oral tablet, extended release

Cardiovascular

Cardiovascular side effects have included palpitations, tachycardia, and cardiovascular collapse and death.

Gastrointestinal

Gastrointestinal side effects have included nausea and vomiting.

Nervous system

Nervous system side effects have included nervousness, dizziness, sleeplessness, light-headedness, tremor, hallucinations, convulsions, CNS depression, fear, anxiety, headache, and increased irritability or excitement.

Respiratory

Respiratory side effects have included respiratory difficulties.

General

General side effects have included weakness and slight drowsiness.

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