Ethanol's acute effects are largely due to its nature as a central nervous system depressant, and are dependent on blood alcohol concentrations:<br>
 
20–99 mg/dL - Impaired coordination and euphoria<br>
100–199 mg/dL - Ataxia, poor judgement, labile mood<br>
200–299 mg/dL - Marked ataxia, slurred speech, poor judgement, labile mood, nausea and vomiting<br>
300–399 mg/dL - Stage 1 anaesthesia, memory lapse, labile mood<br>
400+ mg/dL - Respiratory failure, coma
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