Narcotics Anonymous is the Basic Text of NA, or the “Narcotics Anonymous Big Book.”
The book offers practical help for anyone struggling with drug use problems. It does not go into the causes of addiction but instead it offers day to day help as well an introduction to the Narcotics Anonymous 12-Step program. There are numerous stories of people who found this program to be a lifesaver.
The subject of the book is addiction in general, and not specific to substances.
Narcotics Anonymous explains the disease concept of addiction, the 12 step approach to recovery, and gives other self-help information.