The recovery position
If the patient is unconscious, there is a safe position to put them in which allows them to breathe easily and stops them choking on any vomit. However, you must first carefully consider whether there is any chance that the casualty has hurt their back or neck, or has an injury that would be made worse by moving them. Putting them in the recovery position in this case could have serious consequences. If you are in any doubt, and the casualty is in no further danger by being left in their original position, do not move them. Wait for the paramedics to arrive.
How to put someone in the recovery position
Once you have checked that they are breathing normally, lie them on one side, with a cushion at their back, bring their knee forward, and point their head downward to allow any vomit to escape without them swallowing it or breathing it in. Remember, when you are moving the patient onto their side, make sure their neck and back are well supported.