Blood alcohol levels

Symptoms of drunkenness at different levels of blood alcohol concentration (BAC).

BAC

Symptoms

<50 mg/dL

Some impairment in motor coordination and thinking ability

Talkativeness

Relaxation

50-150 mg/dL

Altered mood (increased wellbeing or unhappiness)

Friendliness, shyness or argumentativeness

Impaired concentration and judgement

Reduced sexual disinhibition

150-250 mg/dL

Slurred speech

Unsteady walking

Nausea

Double vision

Increased heart rate

Drowsiness

Mood, personality and behaviour changes that may be sudden, angry and antisocial

300 mg/dL

Unresponsive/extremely drowsy

Speech incoherent/confused

Memory loss

Vomiting

Heavy breathing

>400 mg/dL

Breathing slowed, shallow or stopped

Coma

Death

Adapted from: Table 163.1 in Brust, J. C. M. (2005). Alcoholism. In L. P. Rowland (Ed.), Merritt’s neurology (11th ed.). Philadelphia: Lippincott Williams and Wilkins.and Table 1 in Vonghia, L., Leggio, L., Ferrulli, A., Bertini, M., Gasbarrini, G., Addolorato, G., et al. (2008). Acute alcohol intoxication. European Journal of Internal Medicine, 19(8), 561-567.

​Go to the body effects section to find out more about the effects of alcohol on your body. 
 
Go to the health effects section to find out how alcohol can affect your health.