De hyppigst indberettede ADRs i de længevarende kliniske forsøg var svimmelhed (42%), kvalme (30%), nystagmus (23%), konfusionstilstand (25%), abnorm gangart (16%), svigtende hukommelse (13%), sløret syn (14%), hovedpine (12%), asteni (13%), opkastning (11%) og somnolens (10%).
The most commonly reported ADRs reported in long-term clinical trials were dizziness (42%), nausea (30%), nystagmus (23%), confusional state (25%), gait abnormal (16%), memory impairment (13%), vision blurred (14%), headache (12%), asthenia (13%), vomiting (11%), and somnolence (10%).