How should a player with suspected concussion be looked after afterwards?

The AIS decision tree for non-healthcare practitioners says athletes should NOT:

• Be left alone initially (at least for 3 hours). Worsening symptoms should lead to immediate medical attention.
• Be sent home by themselves. They need to be with a responsible adult.
• Drink alcohol, or use recreational drugs or drugs not prescribed by their healthcare practitioner.
• Drive a motor vehicle until cleared to do so by a healthcare practitioner.

The AIS also advises checking medications with a doctor, and avoiding aspirin, anti-inflammatories, sleeping tablets and sedating pain medications.