This booklet, the fourth chapter of the World Drug Report 2019, provides analysis of recent trends in the market for stimulants, which include cocaine, amphetamine-type stimulants and new psychoactive substances with stimulant effects. Substances of either a plant-based or synthetic nature, stimulants  increase alertness, heighten arousal and cause behavioural excitement. The early focus of the booklet is on supply of and demand for cocaine, before turning to emerging issues and trends in the consumption and trafficking of amphetamine-type stimulants, including methamphetamine, amphetamine, pharmaceutical stimulants and “ecstasy”. The final part of the booklet looks at supply of and demand for stimulant new psychoactive substances.