People tend to think of drug treatment as a simple unitary thing. That's not true. Just like you don't have a single treatment for hypertension or a single treatment for diabetes, you don't have a single drug treatment.
Drug treatment is composed of a series of elements and components.
Some of it is biological, like medication. Some of it is counseling. Some of it might be mental health services. Some of it might be housing services. We have to help the individual resist the inevitable craving to go back to using drugs.