At Promises, we recognize that depression and anxiety often go hand in hand with substance abuse, so each client is thoroughly assessed to ensure that both disorders are being treated. David Sack, M.D., addiction psychiatrist and CEO of Promises says, - Identifying co-occurring disorders such as substance dependency and depression or anxiety is critical for successful, long-term recovery, and the evidence-based approach in treating dual diagnosis is one of the strengths that sets us apart from other treatment centers.