You should call 911 if you see someone exhibiting behavior that might indicate alcohol poisoning such as any of the following symptoms
Cold, clammy, pale or bluish skin
Unconscious or unable to be roused
Slow or irregular breathing
Puking repeatedly or uncontrollably
After you call 911, place the person on his/her side with knees bent to prevent choking from vomiting. Do not leave that person alone!
Visit the UC Davis Student Health and Counseling Services website for more detailed information on Alcohol Poisoning & How to Help a Drunk Friend