Which of the following is NOT a positive aspect of methadone for heroin addiction?

The focus of the question is on identifying an aspect of methadone that does not reflect a positive characteristic for treating heroin addiction. While methadone is indeed a valuable treatment option, its availability in IV form is not typically considered a positive aspect in this context.

Methadone is primarily administered in oral forms, such as tablets or liquid solutions, which are more suitable for maintenance therapy in treating opioid dependence. The controlled oral administration allows for a stable plasma level of methadone, reducing the risk of overdose and decreasing the potential for abuse compared to intravenous use, which can lead to more immediate effects and a higher likelihood of misuse.

The other characteristics of methadone—being controlled by a physician, being available in tablet form, and being a legal medication—are all considered positive aspects in the context of managing heroin addiction. Controlled administration helps ensure safety and adherence to treatment protocols, while its legal status provides a legitimate therapeutic alternative to illicit drugs, aiding in recovery from addiction.