'Uppers' affect men more powerfully 20:30 10 April 2006 NewScientist.com news service Roxanne Khamsi The stimulating drugs known as amphetamines have a stronger effect on men than women, a new study reveals. The study is the first to reveal how the release of dopamine, an important nerve signalling chemical, differs between the sexes in humans, says Gary Wand of the Johns Hopkins University School of Medicine in Baltimore, Maryland, US. He says the findings could help researchers understand why some disorders such as Parkinson's disease and Tourette's syndrome more commonly afflict men than women. Research suggests that men are more...