Drugs are classified into three categories in the UK based on their potential harm and impact on society, not necessarily the individual. These categories are Class A, Class B, and Class C. Class A drugs are considered the most harmful and carry the harshest penalties. Examples of Class A drugs include heroin, cocaine, ecstasy, and LSD. Class B drugs are considered less harmful than Class A drugs and include amphetamines, barbiturates, cannabis, and dihydrocodeine. Certain Class B drugs are reclassified to Class A if they have been prepared for injection. These include amphetamines, dihydrocodeine, and codeine. Class C drugs are considered the least harmful of the controlled drugs and include benzodiazepines, steroids, and subutex (buprenorphine) . It is important to note that different drugs affect people in different ways and that drugs in all classes, not just those in Class A, are very dangerous.