- Have an average weekly alcohol intake that exceeds 14 units per week, or are unwilling to stop alcohol consumption for 48 hours prior to each admission to the clinical research unit (CRU) and while resident at the CRU (1 unit = 12 ounce [oz] or 360 mL of beer; 5 oz or 150 mL of wine; 1.5 oz or 45 mL of distilled spirits)