What does cross addiction and cross dependence mean?

Answer:

Drugs can be grouped into different classes according to their effect on the central nervous system (your brain and its connections to the various organs and other parts of your body). If you are using a drug repeatedly over a period of time, you will develop dependence on that drug. But you will also develop dependence to other drugs that you have not used that are in the same class as the drug you are using. This means that when you stop using one drug and begin to experience withdrawal, prescribed use of another drug in the same class might stop or decrease the severity of withdrawal. An example is the use of methadone (a narcotic) to help heroin (a narcotic) users avoid withdrawal. Cross addiction has also been used to describe addiction to more than one drug, whether or not it is in the same class
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