Janis has just volunteered to undergo treatment for drug addiction. after she leaves the clinic, she is to stay off drugs because her recovery at the clinic was

Janis has just volunteered to undergo treatment for drug addiction. after she leaves the clinic, she is likely to stay off drugs because her recovery at the clinic was. a very difficult ordeal.
To overcome a drug addiction, addicts first must eliminate all the drug residual from their body (most commonly as detoxing). This process is really painful, to the point where the addicts will no longer want to take another drugs because they associate it with those painful feelings

Agonist is the answer i believe