How is a "prescribed restricted substance" defined?

A "prescribed restricted substance" is defined as any substance specified in Schedule Four of the Poisons List. This designation indicates that these substances require a prescription due to their potential risks and the need for professional supervision when used. Schedule Four specifically includes drugs that may be effective for treatment but also possess variables related to safety, efficacy, and potential for abuse or adverse effects.

This classification helps regulate medications to ensure that they are used appropriately and minimizes the risk of misuse by requiring healthcare professional oversight. The other options do not accurately capture the specificity needed for this definition; for instance, solely focusing on effectiveness would ignore the regulatory aspects linked to prescribing, and a general class of drugs or substances “banned entirely” lacks the nuance and specificity given in the Poisons List.