As the primary outcome parameter of study phase 1, we will determine the patients who respond to ethanol by tremor reduction versus patients without reduction of tremor intensities, as measured using spiral analysis of the dominant hand. Criterion for response will be operationally defined in a dichotomized fashion as reduction of tremor intensities, larger than the known diurnal variation of ET. Therefore, a patient will be considered a responder, if spirographic tremor amplitudes decrease by 35% or more at the time-point 60 minutes after an oral ethanol administration, as compared to baseline. As secondary outcome parameters, spiral data from the non-dominant hand, as well as clinical rating scales and breath alcohol levels will be measured to correlate objective with subjective ratings of ethanol effect in ET.