# diphenoxylate (21 CFR 1308.15(c)(4)) — Federal controlled substance schedule (I-V) by drug, with DEA code number

For diphenoxylate (21 CFR 1308.15(c)(4)), substance is diphenoxylate; schedule is Schedule V; listed under is Narcotic drugs containing non-narcotic active medicinal ingredients; only when is Not more than 2.5 milligrams of diphenoxylate and not less than 25 micrograms of atropine sulfate per dosage unit; cfr citation is 21 CFR 1308.15(c)(4), recorded from its source on 2026-09-01.

- **Substance:** diphenoxylate _(verified: appears in the quote below)_
- **Schedule:** Schedule V _(verified: appears in its own passage below)_
- **Listed under:** Narcotic drugs containing non-narcotic active medicinal ingredients _(verified: appears in its own passage below)_
- **Only when:** Not more than 2.5 milligrams of diphenoxylate and not less than 25 micrograms of atropine sulfate per dosage unit _(verified: appears in the quote below)_
- **CFR citation:** 21 CFR 1308.15(c)(4) _(our reading, not quoted from the source)_

## What the source says

> (4) Not more than 2.5 milligrams of diphenoxylate and not less than 25 micrograms of atropine sulfate per dosage unit.

## Where each value comes from

This source states these in separate places, so each value is shown with the passage that states it.

### Schedule

> § 1308.15 Schedule V.

### Listed under

> (c) Narcotic drugs containing non-narcotic active medicinal ingredients.

## Source

- https://www.ecfr.gov/current/title-21/chapter-II/part-1308

Last verified: 2026-09-01. Review by: 2026-12-30.
Part of [Federal controlled substance schedule (I-V) by drug, with DEA code number](https://referencesource.org/dea-controlled-substance-schedule-by-drug/).