• Fahn-Tolosa-Marin Essential Tremor Rating Scale (FTM) total score [ Time Frame: 61 days ] [ Designated as safety issue: No ]
  

• Writing tablet recordings of tremor amplitude [ Time Frame: 61 days ] [ Designated as safety issue: No ]
  

Inclusion Criteria:

1. Outpatients with essential tremor diagnosed by a movement disorder specialist.
2. Age 18 years to 80 years.
3. Postural tremor severity score of greater than or equal to 2 in the dominant hand/arm as measured by the FTM rating scale.
4. Women of child-bearing potential must use a reliable method of contraception and must provide a negative pregnancy test at entry into the study.
5. Baseline EKG read as within normal limits (no clinically significant abnormalities)obtained from primary care physician or cardiologist (performed within the past year).
6. Serum creatine kinase, complete metabolic blood count, liver function tests, renal function tests, and platelets are within normal limits (blood drawn within the past year).
7. Stable doses of all medications for 30 days prior to study entry and for the duration of the study.

Exclusion Criteria:

1. Any illness that in the investigator's opinion preclude participation in this study.
2. Pregnancy or lactation.
3. Concurrent participation in another clinical study.
4. Dementia or other psychiatric illness that prevents the patient from giving informed consent (Mini Mental Status Exam score less than 24).
5. Legal incapacity or limited legal capacity.
6. Presence of severe renal disease (BUN 50% greater than normal or creatine clearance <60 mL/min) or hepatic disease.
7. Presence of severe daytime sleepiness.
8. Abnormal creatine kinase and/or platelet count in the past year.
9. Present complaints of somnolence, dizziness, blurred vision, bleeding tendencies, cardiac abnormalities.
10. Previous lack of response to other ET therapies (propranolol AND primidone).
11. Patients who have had deep brain stimulation (DBS).
12. Concomitant treatment with gabapentin.