Drug rehab doctors can go by a variety of titles depending on their specific area of expertise and training. Some common titles for doctors who specialize in drug addiction treatment and rehabilitation include:

Addiction Medicine Specialist
Addiction Psychiatrist
Behavioral Health Specialist
Substance Abuse Counselor

These professionals work in a variety of settings, including hospitals, treatment centers, and private practices. They may use a combination of medication, therapy, and other approaches to help individuals recover from drug addiction and maintain sobriety.