Answer: Maintenance therapy
Explanation:
This is a type of maintenance therapy that is used usually at the beginning of the treatment. Methadone is also opioid which means that is addictive but it is not the same as heroin.
Methadone is also bad, but it is safer for patients, it is taken orally, it is not injected as heroin so it cannot lead patients to various diseases such as HIV. Another different and good thing is that there is no need for the crime of stealing when it comes to methadone.