This medicine may cause pseudotumor cerebri (increased pressure in the brain). Call your doctor right away if you have blurred or double vision, dizziness, eye pain, severe headache, or nausea and vomiting.
Encephalopathic syndrome (brain problem) may occur in patients using this medicine together with a medicine to treat mental illness (eg, chlorpromazine [Thorazine®], clozapine [Clozaril®], fluphenazine [Prolixin®], haloperidol [Haldol®], perphenazine [Trilafon®], risperidone [Risperdal®], thioridazine [Mellaril®]). Check with your doctor right away if you have the following symptoms while using this medicine: fever, confusion, drowsiness, difficulty with speaking, uncontrolled body movements, and unusual tiredness or weakness.