# Schedules of Controlled Substances: Placement of Diphenidine in Schedule I

**Action Urgency Score:** 30/100

| Field | Value |
|---|---|
| Agency | Justice Department; Drug Enforcement Administration |
| Type | Final rule |
| Action | Final rule. |
| Published | 2026-09-21 |
| Effective | 2026-10-21 |
| Significant | No |
| CFR parts | 21 CFR 1308 |
| Summary | With the issuance of this final rule, the Drug Enforcement Administration places the substance diphenidine (1-(1,2- diphenylethyl)piperidine), including its salts, isomers, and salts of isomers whenever the existence of such salts, isomers, and salts of isomers is possible, in schedule I of the Controlled Substances Act. This action is being taken, in part, to enable the United States to meet its obligations under the 1971 Convention on Psychotropic Substances. This action imposes the regulatory controls and administrative, civil, and criminal sanctions applicable to schedule I controlled subs |
| Document number | 2026-19231 |

## Why this score
- Final rule.

Source: Federal Register API (Office of the Federal Register) (https://www.federalregister.gov/documents/2026/09/21/2026-19231/schedules-of-controlled-substances-placement-of-diphenidine-in-schedule-i). Last refreshed: 2026-11-04T09:17:43.641Z.
Data from the Federal Register API; the published Federal Register document is authoritative. Informational only, not legal advice.