Which controlled-substance schedule shows low—moderate physical dependence?

Schedule I substances are considered to have a high potential for abuse and no accepted medical use in the United States. They are associated with severe physical and psychological dependence. Examples include heroin and LSD, which are strictly regulated due to their high risk of addiction and lack of therapeutic benefits.

Schedule II substances have a high potential for abuse, which may lead to severe psychological or physical dependence. While they have accepted medical uses, such as opioids (e.g., morphine, oxycodone), they are subject to strict regulations. The higher dependence potential makes them distinct from Schedule III substances.

Schedule IV substances have a lower potential for abuse relative to Schedule III, and they are associated with limited physical dependence. Examples include benzodiazepines like alprazolam and diazepam. Although they can lead to dependence, the risk is lower compared to Schedule III substances, which display moderate dependence potential.