Hi, Nelson; sorry to hear your son is addicted to Kratom powder. Scientists are still working on it, but for now, behavioral therapy is considered the best treatment for addiction to Kratom powder. Since your son lives in a different city, I suggest you travel to his city or ask him to come home. This way, you can help him to get over his addiction. Take him to an experienced and professional therapist. The therapist would conduct some sessions to help him get over his addiction. This might take time, but soon you will see positive results.