Molecular model of the stimulant drug Mephedrone. This drug is classed as an amphetamine and cathinone. Used as a recreational drug, it is illegal in many countries. Mephedrone can make users feel confident, talkative and euphoric. It can also cause a loss of appetite. Side effects of the drug include nosebleeding, overstimulating and damaging the heart and circulation. Atoms are represented as spheres and are colour-coded: carbon (black), hydrogen (grey), nitrogen (blue) and oxygen (red).