Amphetamines or Speed reduces your attention span whilst driving, affecting your ability to react to things, and:
- Causes headaches and dizziness
- Can lead to an irregular heartbeat and irregular breathing
- Can lead to feelings of irritation and cramps
- Affects co-ordination and can cause you to collapse.
As speed is a mental stimulant it can make you feel alert and confident but also makes you overly excited and restless. A few hours in and the effects are rapid mood swings, depression, sleep problems, total exhaustion and fatigue.