After reading this chapter, you will be able to:

• Identify the main classes of drugs.
• Describe the effects of each class of drugs on the nervous system.
• Predict how different drugs will affect behavior, based on the neural systems on which those drugs act.
• Illustrate how the brain changes during addiction.
• Discuss the role of learning in overdose and addiction.
• Explain how pharmacology can be used to treat addiction.
• Contrast the environmental and hereditary influences on addiction.