It causes the body to release adrenaline and noadrenaline.

In the short run that is stimulating. In the long run it is detrimental to your body.

Very simplified speaking it is chemically related to amphetamines, which are shaped in a similar way like dopamine, adrenaline and the other stimulating hormones. So they all end up interactinf with similar parts of your hormone/neurotransmitter system.