21 CFR § 1.1390 - When will modified requirements that we adopt or an exemption that we grant become effective?

---
identifier: "/us/cfr/t21/s1.1390"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 1.1390 - When will modified requirements that we adopt or an exemption that we grant become effective?"
title_number: 21
title_name: "Food and Drugs"
section_number: "1.1390"
section_name: "When will modified requirements that we adopt or an exemption that we grant become effective?"
chapter_name: "FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "A"
subchapter_name: "GENERAL"
part_number: "1"
part_name: "GENERAL ENFORCEMENT REGULATIONS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "15 U.S.C. 1333, 1453, 1454, 1455, 4402; 19 U.S.C. 1490, 1491; 21 U.S.C. 321, 331, 332, 333, 334, 335a, 342, 343, 350c, 350d, 350j, 352, 355, 360b, 360ccc, 360ccc-1, 360ccc-2, 362, 371, 374, 381, 382, 384a, 387, 387a, 387c, 393, and 2223; 42 U.S.C. 216, 241, 243, 262, 264, 271."
regulatory_source: "42 FR 15553, Mar. 22, 1977, unless otherwise noted."
cfr_part: "1"
---


# 1.1390 When will modified requirements that we adopt or an exemption that we grant become effective?

Any modified requirements that FDA adopts or exemption that we grant will become effective on the date that notice of the modified requirements or exemption is published in the *Federal Register**,* unless otherwise stated in the notice.