1.   Drugs used to control behaviour, such as amphetamine derivatives, can be continued during the diet.

2.   Animal studies of ecstasy, an amphetamine derivative, have found it can trigger a sudden release of serotonin, which has a powerful effect on mood.

3.   Ecstasy, an amphetamine derivative that is psychologically but not physically addictive, is popular among young people.

4.   The illegal drug known as Ecstasy, an amphetamine derivative, combines some of the mind-altering effects of the hallucinogen mescaline and the stimulant methamphetamine.

5.   Also known as ice or shabu, the crystalline amphetamine derivative is smokeable and has a huge illegal market across the Far East.