These substances are called narcotics.
You make them watch Twilight.
The purpose of itching powder is to make a person itch. The itching powder will make the person feel like they are going crazy.
consult the doctor
There are lots of them, far too many to list here.
If they are unconscious and breathing, nothing will happen. If they are unconscious and not breathing, they will die.
When a diabetic person becomes unconscious, check for their emergency glucagon injection kit, as you are calling 911. Once the person is conscious, treat the same as you would a person who has not been unconscious.
When the person does not respond
Go to sleep.
Depends on the person and situation.
yes...mind over matter; subjective thoughts into the unconscious mind will have that effect on you.
a unconscious person needs oxygen because without oxygen they will sufer serious brain damage and can possable die.