From the National Council on Alcoholism and Drug Dependence, Inc.

Some (But Not All) Signs and Symptoms:

• Unconsciousness or semiconsciousness (the person cannot wake up or cannot respond to you)
• Slow respirations (breaths) of eight or less per minute, or lapses of more than eight seconds between breaths
• Cold, clammy, pale, or bluish skin

• Call 911 immediately! This is a medical emergency! Any one of these symptoms requires professional medical attention.
• While waiting for the 911 emergency transport, gently turn the intoxicated person on his/her side and maintain that position with a pillow behind the person's back. This it to prevent the person from choking should the person vomit. Also, stay with the person until medical help arrives.
• If you cannot decide if the person is severely intoxicated or just "sleeping it off," it is still better to be safe than sorry. A semi-conscious person may still have alcohol in their stomach that will continue to enter the bloodstream and cause danger. You cannot afford to guess! If the person cannot respond to you, call a health professional immediately.