Final answer:
The average dose range of methadone that yields the best results in decreasing illicit drug use is typically between 60-120 mg per day.
Step-by-step explanation:
The average dose range of methadone that yields the best results in decreasing illicit drug use varies depending on the individual and their specific needs. However, research has shown that a dose range of 60-120 mg per day is commonly effective in reducing opioid cravings and decreasing illicit drug use. It's important to note that the optimal dose may vary for each individual, and it should be determined by a healthcare professional in a specialized treatment setting.