For this discussion, choose at least two different areas of pharmacology and discuss the process by which the drugs work in those areas. Your post should indicate that you know and understand the process, but you should add to that by discussing how this might apply to drug use and addiction. For example, you may want to discuss what is it about drugs that affect the brain function or chemistry that cause people to want more and more, or any other area you choose to discuss.
Some suggested topics for this discussion include: effects of drugs, administration of drugs, bioavailability/biotransformation, half-life and effectiveness, or brain and nervous system processes (neurotransmission).
These areas are discussed in your book, though you may find other sources to help with your discussion as well. Be sure to use and cite sources in your discussion with the complete references at the bottom.