Bivirkninger, som er rapporteret efter indtagelse af mindst 5 gange den anbefalede daglige dosis, er: konfusion, diarré, træthed, hovedpine, utilpashed, mydriasis, kløe, rastløshed, sedation, døsighed, stupor, takykardi, tremor og urinretention.
Adverse events reported after an intake of at least 5 times the recommended daily dose are: confusion, diarrhoea, dizziness, fatigue, headache, malaise, mydriasis, pruritus, restlessness, sedation, somnolence, stupor, tachycardia, tremor, and urinary retention.