Codeine / diphenhydramine / phenylephrine Side Effects
Nervous system side effects have included drowsiness, dizziness, headache, nervousness, restlessness, impairment of mental performance, weakness, mental clouding, lethargy, anxiety, convulsions, CNS depression, tremor, and insomnia.[Ref]
Psychiatric side effects have included fear, dysphoria, psychic dependence, feeling of well-being, confusion, and mood changes.[Ref]
Respiratory side effects have included respiratory difficulty and respiratory depression.[Ref]
Ocular side effects have included blurring of vision and visual disturbances.[Ref]
1. "Product Information. Endal CD (codeine / diphenhydramine / phenylephrine)." Tiber Laboratories, Suwanee, GA.
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Some side effects may not be reported. You may report them to the FDA.