40 - 60% af patienter), træthed, svimmelhed, nervøsitet, depression, abnorm tankegang, søvnløshed, reduceret mobilitet (hypokinesi), reduceret sansning (hypæstesi), gangforstyrrelser, ændret smagssans og hovedpine.
Rarely or very rarely minor weakness of the arms or legs and intestinal paralysis, and epileptic fits can occur.