Last Updated on Thursday, 24 September 2009 12:52
Call an ambulance. Dial 111. Don't delay because you think you or your friend might get into trouble. Ambulance officers are not obliged to involve the police.
Stay with the person until the ambulance arrives. Find out if anyone at the scene knows mouth-to-mouth resuscitation or cardiopulmonary resuscitation (CPR).
Ensure the person gets enough air by keeping crowds back and opening windows. Loosen tight clothing.
If the person is unconscious, don't leave them on their back - they could choke.
Turn them on their side and into the recovery position. Gently tilt their head back so their tongue does not block their airway.
If breathing has stopped, give mouth-to-mouth resuscitation. If there is no pulse, apply CPR.
Provide the ambulance officers with as much information as you can - what drugs were taken, how long ago, and any pre-existing medical conditions that you know the person has.
Talk to your friends about what to do in a crisis before you take any drugs.