| Code Value |
Definition |
| I | Schedule I Controlled Substances. Substances in this schedule have no currently accepted medical use in the United States, a lack of accepted safety for use under medical supervision, and a high potential for abuse. |
| II | Schedule II Controlled Substances. Substances in this schedule have a high potential for abuse which may lead to severe psychological or physical dependence. |
| III | Schedule III Controlled Substances. Substances in this schedule have a potential for abuse less than substances in Schedules I or II and abuse may lead to moderate or low physical dependence or high psychological dependence. |
| IV | Schedule IV Controlled Substances. Substances in this schedule have a low potential for abuse relative to substances in Schedule III. |
| V | Schedule V Controlled Substances. Substances in this schedule have a low potential for abuse relative to substances listed in Schedule IV and consist primarily of preparations containing limited quantities of certain narcotics. |