• Speed is a stimulant. It quickens the heart beat and breathing rate.

• Users may feel confident. Their mind races and they feel more awake, energetic and talkative.

• Effects last up to 4 hours, depending on the dose. Common effects include sweating, nausea, abdominal cramps and headache.

• Speed stops the user from eating and keeps them awake. If used regularly speed can lead to weight loss and exhaustion.

• The comedown (tiredness and depression) lasts for one or two days, and sometimes longer.

• Taking lots of speed can make user irritable, tense, anxious and sometimes aggressive.