Meget almindeligt indberettede bivirkninger (forekommer hos mere end 1 ud af 10 patienter i kliniske forsøg) omfatter: konfusion, svimmelhed, sløret syn, hovedpine, hurtige frem- og- tilbage bevægelser af øjnene, hukommelsestab eller dårlig hukommelse (glemsomhed), vanskelighed ved at gå, opkastning, kvalme, generel svaghed og søvnighed.
Very common reported side effects (occurring in more than 1 out of 10 patients in clinical trials) include: confusion, dizziness, blurred vision, headache, rapid back-and-forth movement of the eyes, loss or impairment of memory (forgetfulness), difficulty walking, vomiting, nausea, general weakness and drowsiness.