Cerebellar tremor and cerebellar gait instability are present in up to 70% of chronic MS patients and account for a significant amount of clinical morbidity. Cerebellar tremor is a major therapeutic problem in MS since currently there are no effective treatments. To date medical therapies including propranolol, clonazepam, carbamazepine, isoniazid, phenobarbitone, ondansetron, topiramate, gabapentin and cannabis have all been studied with little sustained benefit. More radical surgical treatments including thalamotomy and Deep Brain Stimulation have also been attempted.