Speed is a stimulant which can make you feel more awake and alert. Users may feel more confident. However, it creates a feeling of loss of coordination. It will make people less likely to react on time to potential dangers. The effects can last up to several hours depending on how it was taken, and from person to person.
The specific effects of driving on Speed are:
Headaches and dizziness
Irregular heartbeat and breathing
Irritability, restlessness and anxiety as the effects wear off
After an initial alertness, the user can experience sleeping problems, exhaustion and fatigue
For general information on Speed and it’s effects Talk to Frank – Speed