Ikke almindelige bivirkninger inkluderer: svimmelhed, svaghed, nedsat koordination af bevægelser, vaklen og/ eller fald (ataksi), nedsat koncentration, sløvhed, hvileløshed, depression, ophidselse, irritabilitet, forvirring, unormal tænkning og opførsel (udadvendthed som ikke synes at passe til personen, nedsat hæmning, aggressivitet, raseri, vrangforestillinger, depersonalisation, psykose), mareridt, hallucinationer, dobbeltsyn eller andre synsproblemer, øget følsomhed over for støj (hyperakusis), lugtforstyrrelser (parosmi), taleforstyrrelser, inkl. sløret tale, følelsesløshed, f. eks. i arme og ben (hypæstesi), kvalme, nedsat appetit, øget lysoverfølsomhed (sollys, UV- lys), utilpashed (malaise).
Uncommon side effects include: dizziness; weakness; reduced coordination of movements; unsteadiness and/ or falls (ataxia); decreased concentration; apathy; restlessness; depression; agitation; irritability; confusion, abnormal thinking and behaviour (extroversion that seems out of character, decreased inhibition, aggressiveness, rages, delusion, depersonalisation, psychosis); nightmares; hallucinations; double vision or other sight problems; increased sensitivity to noise (hyperacusis); smell disorder (parosmia); speech disorders, including slurred speech; numbness, e. g. in the extremities (hypoaesthesia); nausea; decreased appetite; increased sensitivity to light (sunlight, UV light); feeling vaguely ill (malaise).