I’d argue that the Schedule 4 extended definition applies at minimum-
The drug or other substance has a low potential for abuse relative to the drugs or other substances in Schedule III
The drug or other substance has a currently accepted medical use in treatment in the United States
Abuse of the drug or other substance may lead to limited physical dependence or psychological dependence relative to the drugs or other substances in Schedule III
Given that Sch3 has ketamine, anabolic steroids, barbiturates, etc, I’d say the above applies