DSM is just a book to label symptoms. They do have labels for withdrawal symptoms but if you’re asking if it outlines how to treat withdrawals no. That’s more a medical field and you need a psychiatrist who specializes in withdrawals. Most psychiatrists have training in withdrawals but some specialize in it. DMS is widely used in USA but not so much other places. It’s basically a list of numbers to be assigned to symptoms for insurance purposes. Places with national health can be more holistic and work with a person without needing to label them the first session.