The signs and symptoms of using speed can include:

• Increased and irregular heart rate
• Increased breathing
• Teeth grinding
• Nervousness
• Restlessness
• Insomnia
• Aggression
• Fever and sweating
• Headaches
• Blurred vision
• Overheating
• Dry mouth and lips
• Dilated pupils
• Nausea and vomiting
• Mood swings
• Hallucinations
• Paranoia

The consequences of using speed may include:

• Chronic sleep problems
• Cracked teeth through grinding
• Panic attacks
• Insomnia
• Anxiety
• Decreased emotional control
• Severe depression
• Violent behaviour
• Speed psychosis
• Nerve cell damage
• Death from heart failure or stroke
• High risk of dependence (addiction), especially if injected
• HIV and hepatitis infections through needle sharing