Chlorzoxazone

Product NDC: 0591-2520
11-digit product format: 005912520
Labeler code: 0591
Product ID: 0591-2520_9ea218a7-b12c-4aec-9c0b-3104b03649ce
Type: HUMAN PRESCRIPTION DRUG
Nonproprietary name: Chlorzoxazone
Dosage form: TABLET
Route: ORAL
Labeler: Actavis Pharma, Inc.
Application: ANDA089859
Marketing category: ANDA
Marketing start: 2011-08-22
Substance: CHLORZOXAZONE
Active strength: 500 mg/1
Pharmacologic classes: Centrally-mediated Muscle Relaxation [PE], Muscle Relaxant [EPC]
NDC exclude flag: No
Listing certified through: 2026-12-31
Current FDA listing: Yes

NDC auxiliary status#

These records are reproduced from FDA’s unfinished, excluded, and compounder listings. They describe what appeared in the source files; a missing record does not establish a regulatory status. View all current auxiliary records, including entries without an NDC. · View the auxiliary file history.

Current NDC status page 1 of 1 · 3 matching rows.

Dataset, Scope, Product NDC table
Dataset	Scope	Product NDC	Package NDC	Code	Status	Source date
unfinished product	product	0591-2520		UNFINISHED	Active or certified unfinished drug listing	2026-08-17
unfinished package	package	0591-2520	0591-2520-00	UNFINISHED	Active or certified unfinished drug listing	2026-08-17
unfinished package	package	0591-2520	0591-2520-77	UNFINISHED	Active or certified unfinished drug listing	2026-08-17

Observed NDC auxiliary status history#

This history shows the information present in each captured FDA auxiliary file. It is not a continuous regulatory timeline, and a missing record does not establish a status.

Historic NDC status page 1 of 1 · 53 matching rows.

View current auxiliary records. · View the auxiliary file history.

Captured / source date, Dataset, Scope table
Captured / source date	Dataset	Scope	Package NDC	Snapshot	Source SHA-256
2025-12-14 21:27 UTC · source 2025-12-05	unfinished product	product		`a6255e0c9aa5…`	`a0211a219f2e…`
2025-12-14 21:27 UTC · source 2025-12-05	unfinished package	package	0591-2520-77	`a6255e0c9aa5…`	`a0211a219f2e…`
2025-12-14 21:27 UTC · source 2025-12-05	unfinished package	package	0591-2520-00	`a6255e0c9aa5…`	`a0211a219f2e…`
2025-08-26 23:59 UTC · source 2025-08-26	unfinished product	product		`1d862106b807…`	`00c93037cd84…`
2025-08-26 23:59 UTC · source 2025-08-26	unfinished package	package	0591-2520-77	`1d862106b807…`	`00c93037cd84…`
2025-08-26 23:59 UTC · source 2025-08-26	unfinished package	package	0591-2520-00	`1d862106b807…`	`00c93037cd84…`
2025-05-15 14:59 UTC · source 2025-05-14	unfinished product	product		`390b4c401c3f…`	`2c692c2daee3…`
2025-05-15 14:59 UTC · source 2025-05-14	unfinished package	package	0591-2520-77	`390b4c401c3f…`	`2c692c2daee3…`
2025-05-15 14:59 UTC · source 2025-05-14	unfinished package	package	0591-2520-00	`390b4c401c3f…`	`2c692c2daee3…`
2025-04-01 07:37 UTC · source 2025-03-31	unfinished product	product		`e30019b0c005…`	`a3f0b14938b7…`
2025-04-01 07:37 UTC · source 2025-03-31	unfinished package	package	0591-2520-77	`e30019b0c005…`	`a3f0b14938b7…`
2025-04-01 07:37 UTC · source 2025-03-31	unfinished package	package	0591-2520-00	`e30019b0c005…`	`a3f0b14938b7…`
2025-03-01 13:19 UTC · source 2025-02-28	unfinished product	product		`bbbc9f937eca…`	`946b9c97cf81…`
2025-03-01 13:19 UTC · source 2025-02-28	unfinished package	package	0591-2520-77	`bbbc9f937eca…`	`946b9c97cf81…`
2025-03-01 13:19 UTC · source 2025-02-28	unfinished package	package	0591-2520-00	`bbbc9f937eca…`	`946b9c97cf81…`
2025-02-27 05:24 UTC · source 2025-02-26	unfinished product	product		`f268b84574a6…`	`26285f5ac5df…`
2025-02-27 05:24 UTC · source 2025-02-26	unfinished package	package	0591-2520-77	`f268b84574a6…`	`26285f5ac5df…`
2025-02-27 05:24 UTC · source 2025-02-26	unfinished package	package	0591-2520-00	`f268b84574a6…`	`26285f5ac5df…`
2025-02-01 13:13 UTC · source 2025-01-31	unfinished product	product		`f764e8902f78…`	`92046438deef…`
2025-02-01 13:13 UTC · source 2025-01-31	unfinished package	package	0591-2520-77	`f764e8902f78…`	`92046438deef…`
2025-02-01 13:13 UTC · source 2025-01-31	unfinished package	package	0591-2520-00	`f764e8902f78…`	`92046438deef…`
2025-01-20 13:05 UTC · source 2025-01-17	unfinished product	product		`68b1e3bced9e…`	`98a755eb8bc6…`
2025-01-20 13:05 UTC · source 2025-01-17	unfinished package	package	0591-2520-77	`68b1e3bced9e…`	`98a755eb8bc6…`
2025-01-20 13:05 UTC · source 2025-01-17	unfinished package	package	0591-2520-00	`68b1e3bced9e…`	`98a755eb8bc6…`
2024-11-29 20:42 UTC · source 2024-11-29	unfinished product	product		`05c55d027831…`	`ca05dca9dc4c…`
2024-11-29 20:42 UTC · source 2024-11-29	unfinished package	package	0591-2520-77	`05c55d027831…`	`ca05dca9dc4c…`
2024-11-29 20:42 UTC · source 2024-11-29	unfinished package	package	0591-2520-00	`05c55d027831…`	`ca05dca9dc4c…`
2024-11-09 02:36 UTC · source 2024-11-08	unfinished product	product		`48b4f40e6753…`	`c7c7a00d2afa…`
2024-11-09 02:36 UTC · source 2024-11-08	unfinished package	package	0591-2520-77	`48b4f40e6753…`	`c7c7a00d2afa…`
2024-11-09 02:36 UTC · source 2024-11-08	unfinished package	package	0591-2520-00	`48b4f40e6753…`	`c7c7a00d2afa…`
2024-10-09 02:27 UTC · source 2024-10-08	unfinished product	product		`27f29a85d7e4…`	`1372111e901f…`
2024-10-09 02:27 UTC · source 2024-10-08	unfinished package	package	0591-2520-77	`27f29a85d7e4…`	`1372111e901f…`
2024-10-09 02:27 UTC · source 2024-10-08	unfinished package	package	0591-2520-00	`27f29a85d7e4…`	`1372111e901f…`
2024-07-10 04:00 UTC · source 2024-07-09	unfinished product	product		`8d62ce987f31…`	`9fe9ef23e30d…`
2024-07-10 04:00 UTC · source 2024-07-09	unfinished package	package	0591-2520-00	`8d62ce987f31…`	`9fe9ef23e30d…`
2024-05-28 21:11 UTC · source 2024-05-28	unfinished product	product		`d1e113ab4d42…`	`063ee3eb0a1d…`
2024-05-28 21:11 UTC · source 2024-05-28	unfinished package	package	0591-2520-00	`d1e113ab4d42…`	`063ee3eb0a1d…`
2024-05-15 03:51 UTC · source 2024-05-14	unfinished product	product		`50b4072663b7…`	`eae3003ed65e…`
2024-05-15 03:51 UTC · source 2024-05-14	unfinished package	package	0591-2520-00	`50b4072663b7…`	`eae3003ed65e…`
2022-04-09 23:13 UTC · source 2022-04-08	unfinished product	product		`906f6e251498…`	`bf70b80e44f0…`
2022-04-09 23:13 UTC · source 2022-04-08	unfinished package	package	0591-2520-00	`906f6e251498…`	`bf70b80e44f0…`
2021-12-27 23:28 UTC · source 2021-12-27	unfinished product	product		`6db9cb8d1e19…`	`3449e1ec5b70…`
2021-12-27 23:28 UTC · source 2021-12-27	unfinished package	package	0591-2520-00	`6db9cb8d1e19…`	`3449e1ec5b70…`
2021-02-18 23:40 UTC · source 2021-02-18	unfinished product	product		`8fc7167e32ce…`	`e96bbc724034…`
2021-02-18 23:40 UTC · source 2021-02-18	unfinished package	package	0591-2520-00	`8fc7167e32ce…`	`e96bbc724034…`
2020-12-18 03:04 UTC · source 2020-12-17	unfinished product	product		`4184dd79f89f…`	`545327b3e20f…`
2020-12-18 03:04 UTC · source 2020-12-17	unfinished package	package	0591-2520-00	`4184dd79f89f…`	`545327b3e20f…`
2020-06-10 20:45 UTC · source 2020-06-10	unfinished product	product		`4bd3596a7b87…`	`5c64c6f6865f…`
2020-06-10 20:45 UTC · source 2020-06-10	unfinished package	package	0591-2520-00	`4bd3596a7b87…`	`5c64c6f6865f…`
2019-12-08 06:16 UTC · source 2019-12-05	unfinished product	product		`263afe128892…`	`91768de4ddbe…`
2019-12-08 06:16 UTC · source 2019-12-05	unfinished package	package	0591-2520-00	`263afe128892…`	`91768de4ddbe…`
2019-06-01 22:24 UTC · source 2019-05-30	unfinished product	product		`5b2001dcd8f5…`	`54b53d4dc9e4…`
2019-06-01 22:24 UTC · source 2019-05-30	unfinished package	package	0591-2520-00	`5b2001dcd8f5…`	`54b53d4dc9e4…`

Source provenance: Browse the complete Orange Book source catalog · source snapshot 42.

Orange Book products#

Current product rows page 1 of 1 · 1 matching rows.

Application-product, Trade name, Ingredient table
Application-product	Trade name	Ingredient	Strength	Dosage form / route	TE codes	RLD / RS	Approval date
A089859-001	CHLORZOXAZONE	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04

Therapeutic equivalence codes#

Current TE-code rows page 1 of 1 · 1 matching rows.

Application-product, TE code table
Application-product	TE code
A089859-001	AA

Observed Orange Book product history#

Observed FDA ZIP history: Each table is queried independently by exact application/product key from successfully parsed Orange Book snapshots. Capture times identify archived source observations; absence or a change between snapshots is not inferred. FDA publication files that were not recoverable as structured ZIP data are not represented as states.

Product history page 1 of 2 · 42 observed states.

Captured, Edition, Application-product table
Captured	Edition	Application-product	Trade name	Strength	Dosage form / route	Product TE source text	RLD / RS	Approval date	Source SHA-256
2026-08-18 06:07:40	2026-07	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`caaa826d4ba7…`
2026-02-19 14:30 UTC	2026-02	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`011fe1cb6892…`
2025-12-14 10:44 UTC · 2 captures of this ZIP	2025-12	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`31067a03dcf5…`
2025-08-23 18:47 UTC	2025-08	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`6a471c1ec25d…`
2025-03-22 03:13 UTC · 3 captures of this ZIP	2025-03	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`fd3edfee7708…`
2025-02-26 10:13 UTC · 3 captures of this ZIP	2025-02	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`b8a1b40f171c…`
2025-01-19 17:59 UTC · 7 captures of this ZIP	2025-01	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`03ed91905a0d…`
2024-12-13 21:23 UTC · 2 captures of this ZIP	2024-12	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`2680178bc6a6…`
2024-09-14 05:58 UTC · 2 captures of this ZIP	2024-09	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`5bbf6a4d5a75…`
2024-11-08 22:44 UTC · 3 captures of this ZIP	2024-11	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`d8e5a09893c0…`
2024-10-29 15:01 UTC	2024-10	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`d06236e962d9…`
2024-08-13 05:28 UTC · 3 captures of this ZIP	2024-08	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`79d66fd596c7…`
2024-07-13 05:37 UTC · 2 captures of this ZIP	2024-07	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`301d65b070ca…`
2024-06-18 03:08 UTC · 5 captures of this ZIP	2024-06	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`1e350fbaab3a…`
2024-05-31 18:47 UTC	2024-05	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`8072bd15b7f6…`
2022-06-29 02:47 UTC · 2 captures of this ZIP	2022-06	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`5c6f7cd8ea54…`
2022-04-08 23:34 UTC	2022-04	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`5d02ea3f76ae…`
2022-04-04 05:41 UTC	2022-04	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`4b0b4de00fa7…`
2019-12-13 00:20 UTC	2019-12	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`74a2ff9319b5…`
2022-03-09 01:35 UTC	2022-03	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`bb7c543d1eb4…`
2021-12-28 21:50 UTC	2021-12	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`782e0a99824c…`
2021-05-05 16:15 UTC · 3 captures of this ZIP	2021-05	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`87673890dc5c…`
2021-03-12 10:30 UTC	2021-03	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`5aa47cf7b7d7…`
2020-12-22 03:56 UTC	2020-12	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`8869cabd3fbd…`
2020-11-12 02:37 UTC	2020-11	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`c0c555d07b60…`
2019-12-14 00:12 UTC	2019-12	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`3f01610625f2…`
2019-09-15 20:21 UTC	2019-09	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL		RS	1988-05-04	`b00525d2431f…`
2019-07-19 19:46 UTC	2019-07	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL		RS	1988-05-04	`ea99ee380514…`
2024-03-16 18:09 UTC · 4 captures of this ZIP	2024-03	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`6a51e52b5d6a…`
2024-02-18 07:12 UTC	2024-02	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`1c564ffb4f44…`
2023-12-20 04:57 UTC	2023-12	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`ea1830bbd6c7…`
2023-11-28 05:40 UTC · 2 captures of this ZIP	2023-11	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`a72a2bbeb626…`
2023-10-25 00:34 UTC · 2 captures of this ZIP	2023-10	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`9b2671bbb829…`
2023-07-15 15:27 UTC · 2 captures of this ZIP	2023-07	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`a67488948f0b…`
2023-06-13 01:57 UTC · 3 captures of this ZIP	2023-06	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`3f0d92c62455…`
2023-05-13 08:27 UTC	2023-05	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`053a50430f4f…`
2023-01-26 05:58 UTC	2023-01	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`3bdfa0b2c4d7…`
2022-11-12 20:34 UTC · 5 captures of this ZIP	2022-11	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`3a93d1ddd44b…`
2022-10-28 04:53 UTC	2022-10	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`f41ea6bd6efb…`
2022-09-29 23:25 UTC	2022-09	A089859-001	CHLORZOXAZONE	500MG	TABLET / ORAL	AA	RS	1988-05-04	`e64feba35796…`

Observed Orange Book normalized TE history#

Captured, Edition, Application-product table
Captured	Edition	Application-product	TE code	Order	Source SHA-256
2026-08-18 06:07:40	2026-07	A089859-001	AA	1	`caaa826d4ba7…`
2026-02-19 14:30 UTC	2026-02	A089859-001	AA	1	`011fe1cb6892…`
2025-12-14 10:44 UTC · 2 captures of this ZIP	2025-12	A089859-001	AA	1	`31067a03dcf5…`
2025-08-23 18:47 UTC	2025-08	A089859-001	AA	1	`6a471c1ec25d…`
2025-03-22 03:13 UTC · 3 captures of this ZIP	2025-03	A089859-001	AA	1	`fd3edfee7708…`
2025-02-26 10:13 UTC · 3 captures of this ZIP	2025-02	A089859-001	AA	1	`b8a1b40f171c…`
2025-01-19 17:59 UTC · 7 captures of this ZIP	2025-01	A089859-001	AA	1	`03ed91905a0d…`
2024-12-13 21:23 UTC · 2 captures of this ZIP	2024-12	A089859-001	AA	1	`2680178bc6a6…`
2024-09-14 05:58 UTC · 2 captures of this ZIP	2024-09	A089859-001	AA	1	`5bbf6a4d5a75…`
2024-11-08 22:44 UTC · 3 captures of this ZIP	2024-11	A089859-001	AA	1	`d8e5a09893c0…`
2024-10-29 15:01 UTC	2024-10	A089859-001	AA	1	`d06236e962d9…`
2024-08-13 05:28 UTC · 3 captures of this ZIP	2024-08	A089859-001	AA	1	`79d66fd596c7…`
2024-07-13 05:37 UTC · 2 captures of this ZIP	2024-07	A089859-001	AA	1	`301d65b070ca…`
2024-06-18 03:08 UTC · 5 captures of this ZIP	2024-06	A089859-001	AA	1	`1e350fbaab3a…`
2024-05-31 18:47 UTC	2024-05	A089859-001	AA	1	`8072bd15b7f6…`
2022-06-29 02:47 UTC · 2 captures of this ZIP	2022-06	A089859-001	AA	1	`5c6f7cd8ea54…`
2022-04-08 23:34 UTC	2022-04	A089859-001	AA	1	`5d02ea3f76ae…`
2022-04-04 05:41 UTC	2022-04	A089859-001	AA	1	`4b0b4de00fa7…`
2019-12-13 00:20 UTC	2019-12	A089859-001	AA	1	`74a2ff9319b5…`
2022-03-09 01:35 UTC	2022-03	A089859-001	AA	1	`bb7c543d1eb4…`
2021-12-28 21:50 UTC	2021-12	A089859-001	AA	1	`782e0a99824c…`
2021-05-05 16:15 UTC · 3 captures of this ZIP	2021-05	A089859-001	AA	1	`87673890dc5c…`
2021-03-12 10:30 UTC	2021-03	A089859-001	AA	1	`5aa47cf7b7d7…`
2020-12-22 03:56 UTC	2020-12	A089859-001	AA	1	`8869cabd3fbd…`
2020-11-12 02:37 UTC	2020-11	A089859-001	AA	1	`c0c555d07b60…`
2019-12-14 00:12 UTC	2019-12	A089859-001	AA	1	`3f01610625f2…`
2024-03-16 18:09 UTC · 4 captures of this ZIP	2024-03	A089859-001	AA	1	`6a51e52b5d6a…`
2024-02-18 07:12 UTC	2024-02	A089859-001	AA	1	`1c564ffb4f44…`
2023-12-20 04:57 UTC	2023-12	A089859-001	AA	1	`ea1830bbd6c7…`
2023-11-28 05:40 UTC · 2 captures of this ZIP	2023-11	A089859-001	AA	1	`a72a2bbeb626…`
2023-10-25 00:34 UTC · 2 captures of this ZIP	2023-10	A089859-001	AA	1	`9b2671bbb829…`
2023-07-15 15:27 UTC · 2 captures of this ZIP	2023-07	A089859-001	AA	1	`a67488948f0b…`
2023-06-13 01:57 UTC · 3 captures of this ZIP	2023-06	A089859-001	AA	1	`3f0d92c62455…`
2023-05-13 08:27 UTC	2023-05	A089859-001	AA	1	`053a50430f4f…`
2023-01-26 05:58 UTC	2023-01	A089859-001	AA	1	`3bdfa0b2c4d7…`
2022-11-12 20:34 UTC · 5 captures of this ZIP	2022-11	A089859-001	AA	1	`3a93d1ddd44b…`
2022-10-28 04:53 UTC	2022-10	A089859-001	AA	1	`f41ea6bd6efb…`
2022-09-29 23:25 UTC	2022-09	A089859-001	AA	1	`e64feba35796…`
2022-07-09 03:26 UTC · 3 captures of this ZIP	2022-07	A089859-001	AA	1	`cb3db0bc1861…`
2026-07-26 02:55 UTC · 3 captures of this ZIP	2026-06	A089859-001	AA	1	`a50c72e98297…`

Additional Listing Data#

Finished product: Yes
Brand name base: Chlorzoxazone
Listing expiration: 2026-12-31

Active Ingredients#

Ingredient, Strength table
Ingredient	Strength
CHLORZOXAZONE	500 mg/1

Harmonized UNII identifiers#

UNII identifiers page 1 of 1 · 1 matching rows.

Identifier, FDA.report destination table
Identifier	FDA.report destination
H0DE420U8G	Internal UNII lookup

Harmonized RxCUI identifiers#

RxCUI identifiers page 1 of 1 · 1 matching rows.

Identifier, FDA.report destination table
Identifier	FDA.report destination
197502	Internal RxNorm lookup

Harmonized SPL set identifiers#

SPL set identifiers page 1 of 1 · 1 matching rows.

Identifier, FDA.report destination table
Identifier	FDA.report destination
2f05e8e2-616f-475b-ac9f-c42e1a5dbe81	Available on FDA.report

DailyMed Product Concepts#

Product concept, Relation, Version table
Product concept	Relation	Version	Effective
a7ba9d15-162f-2741-f0fc-3516be5e88bd	Product name	7	20250114
cbf4a4f8-16cb-4546-a0cc-fd91bbe774f2	Product name	2	20240223
c6f86816-7da6-43ea-8c25-ac9758311cc5	Product name	1	20220118
0a48cfb8-244e-463e-aa85-fd9bbbc9190a	Product name	2	20200224
252e11b6-1a9a-4283-a242-df2c129c496d	Product name	3	20170717

DailyMed Package Descriptions#

Package NDC, Product, Description table
Package NDC	Product	Description	Form	Quantity	Strength	SPL version
0591-2520-01	Chlorzoxazone	100 in 1 BOTTLE, PLASTIC	TABLET	100		15
0591-2520-05	Chlorzoxazone	500 in 1 BOTTLE, PLASTIC	TABLET	500		15

DailyMed Billing Units#

Package NDC, Billing unit, Product NDC table
Package NDC	Billing unit	Product NDC	DailyMed indexing SPL	SPL version	Effective
0591-2520-01	EA - Each	0591-2520	c68b0735-e584-41ca-bb99-0be350eaaf06	1	2012-07-24
0591-2520-05	EA - Each	0591-2520	ccc38ea1-8e08-4350-9e63-93d3fa49cd0b	1	2012-07-24

DailyMed Socrata Ingredients#

Ingredient, Type, UNII table
Ingredient	Type	UNII	DailyMed label	SPL version
CHLORZOXAZONE	ACTIVE INGREDIENT	H0DE420U8G	CHLORZOXAZONE TABLET [LAKE ERIE MEDICAL DBA QUALITY CARE PRODUCTS LLC]	3135
CHLORZOXAZONE	ACTIVE MOIETY	H0DE420U8G	CHLORZOXAZONE TABLET [LAKE ERIE MEDICAL DBA QUALITY CARE PRODUCTS LLC]	3135
CELLULOSE, MICROCRYSTALLINE	INACTIVE INGREDIENT	OP1R32D61U	CHLORZOXAZONE TABLET [LAKE ERIE MEDICAL DBA QUALITY CARE PRODUCTS LLC]	3135
DOCUSATE SODIUM	INACTIVE INGREDIENT	F05Q2T2JA0	CHLORZOXAZONE TABLET [LAKE ERIE MEDICAL DBA QUALITY CARE PRODUCTS LLC]	3135
LACTOSE MONOHYDRATE	INACTIVE INGREDIENT	EWQ57Q8I5X	CHLORZOXAZONE TABLET [LAKE ERIE MEDICAL DBA QUALITY CARE PRODUCTS LLC]	3135
MAGNESIUM STEARATE	INACTIVE INGREDIENT	70097M6I30	CHLORZOXAZONE TABLET [LAKE ERIE MEDICAL DBA QUALITY CARE PRODUCTS LLC]	3135
SODIUM BENZOATE	INACTIVE INGREDIENT	OJ245FE5EU	CHLORZOXAZONE TABLET [LAKE ERIE MEDICAL DBA QUALITY CARE PRODUCTS LLC]	3135
SODIUM STARCH GLYCOLATE TYPE A POTATO	INACTIVE INGREDIENT	5856J3G2A2	CHLORZOXAZONE TABLET [LAKE ERIE MEDICAL DBA QUALITY CARE PRODUCTS LLC]	3135
STARCH, PREGELATINIZED CORN	INACTIVE INGREDIENT	O8232NY3SJ	CHLORZOXAZONE TABLET [LAKE ERIE MEDICAL DBA QUALITY CARE PRODUCTS LLC]	3135
CHLORZOXAZONE	ACTIVE INGREDIENT	H0DE420U8G	CHLORZOXAZONE TABLET [PD-RX PHARMACEUTICALS, INC.]	15
CHLORZOXAZONE	ACTIVE MOIETY	H0DE420U8G	CHLORZOXAZONE TABLET [PD-RX PHARMACEUTICALS, INC.]	15
CELLULOSE, MICROCRYSTALLINE	INACTIVE INGREDIENT	OP1R32D61U	CHLORZOXAZONE TABLET [PD-RX PHARMACEUTICALS, INC.]	15
DOCUSATE SODIUM	INACTIVE INGREDIENT	F05Q2T2JA0	CHLORZOXAZONE TABLET [PD-RX PHARMACEUTICALS, INC.]	15
LACTOSE MONOHYDRATE	INACTIVE INGREDIENT	EWQ57Q8I5X	CHLORZOXAZONE TABLET [PD-RX PHARMACEUTICALS, INC.]	15
MAGNESIUM STEARATE	INACTIVE INGREDIENT	70097M6I30	CHLORZOXAZONE TABLET [PD-RX PHARMACEUTICALS, INC.]	15
SODIUM BENZOATE	INACTIVE INGREDIENT	OJ245FE5EU	CHLORZOXAZONE TABLET [PD-RX PHARMACEUTICALS, INC.]	15
SODIUM STARCH GLYCOLATE TYPE A POTATO	INACTIVE INGREDIENT	5856J3G2A2	CHLORZOXAZONE TABLET [PD-RX PHARMACEUTICALS, INC.]	15
STARCH, PREGELATINIZED CORN	INACTIVE INGREDIENT	O8232NY3SJ	CHLORZOXAZONE TABLET [PD-RX PHARMACEUTICALS, INC.]	15
CHLORZOXAZONE	ACTIVE INGREDIENT	H0DE420U8G	CHLORZOXAZONE TABLET [ACTAVIS PHARMA, INC.]	7
CHLORZOXAZONE	ACTIVE MOIETY	H0DE420U8G	CHLORZOXAZONE TABLET [ACTAVIS PHARMA, INC.]	7
CELLULOSE, MICROCRYSTALLINE	INACTIVE INGREDIENT	OP1R32D61U	CHLORZOXAZONE TABLET [ACTAVIS PHARMA, INC.]	7
DOCUSATE SODIUM	INACTIVE INGREDIENT	F05Q2T2JA0	CHLORZOXAZONE TABLET [ACTAVIS PHARMA, INC.]	7
LACTOSE MONOHYDRATE	INACTIVE INGREDIENT	EWQ57Q8I5X	CHLORZOXAZONE TABLET [ACTAVIS PHARMA, INC.]	7
MAGNESIUM STEARATE	INACTIVE INGREDIENT	70097M6I30	CHLORZOXAZONE TABLET [ACTAVIS PHARMA, INC.]	7
SODIUM BENZOATE	INACTIVE INGREDIENT	OJ245FE5EU	CHLORZOXAZONE TABLET [ACTAVIS PHARMA, INC.]	7
SODIUM STARCH GLYCOLATE TYPE A POTATO	INACTIVE INGREDIENT	5856J3G2A2	CHLORZOXAZONE TABLET [ACTAVIS PHARMA, INC.]	7
STARCH, CORN	INACTIVE INGREDIENT	O8232NY3SJ	CHLORZOXAZONE TABLET [ACTAVIS PHARMA, INC.]	7
CHLORZOXAZONE	ACTIVE INGREDIENT	H0DE420U8G	CHLORZOXAZONE TABLET [REBEL DISTRIBUTORS CORP]	3
CHLORZOXAZONE	ACTIVE MOIETY	H0DE420U8G	CHLORZOXAZONE TABLET [REBEL DISTRIBUTORS CORP]	3
CELLULOSE, MICROCRYSTALLINE	INACTIVE INGREDIENT	OP1R32D61U	CHLORZOXAZONE TABLET [REBEL DISTRIBUTORS CORP]	3
DOCUSATE SODIUM	INACTIVE INGREDIENT	F05Q2T2JA0	CHLORZOXAZONE TABLET [REBEL DISTRIBUTORS CORP]	3
LACTOSE MONOHYDRATE	INACTIVE INGREDIENT	EWQ57Q8I5X	CHLORZOXAZONE TABLET [REBEL DISTRIBUTORS CORP]	3
MAGNESIUM STEARATE	INACTIVE INGREDIENT	70097M6I30	CHLORZOXAZONE TABLET [REBEL DISTRIBUTORS CORP]	3
SODIUM BENZOATE	INACTIVE INGREDIENT	OJ245FE5EU	CHLORZOXAZONE TABLET [REBEL DISTRIBUTORS CORP]	3
SODIUM STARCH GLYCOLATE TYPE A POTATO	INACTIVE INGREDIENT	5856J3G2A2	CHLORZOXAZONE TABLET [REBEL DISTRIBUTORS CORP]	3
STARCH, CORN	INACTIVE INGREDIENT	O8232NY3SJ	CHLORZOXAZONE TABLET [REBEL DISTRIBUTORS CORP]	3
CHLORZOXAZONE	ACTIVE INGREDIENT	H0DE420U8G	CHLORZOXAZONE TABLET [BRYANT RANCH PREPACK]	2
CHLORZOXAZONE	ACTIVE INGREDIENT	H0DE420U8G	CHLORZOXAZONE TABLET [AIDAREX PHARMACEUTICALS LLC]	2
CHLORZOXAZONE	ACTIVE INGREDIENT	H0DE420U8G	CHLORZOXAZONE TABLET [DIRECT RX]	2
CHLORZOXAZONE	ACTIVE MOIETY	H0DE420U8G	CHLORZOXAZONE TABLET [AIDAREX PHARMACEUTICALS LLC]	2
CHLORZOXAZONE	ACTIVE MOIETY	H0DE420U8G	CHLORZOXAZONE TABLET [BRYANT RANCH PREPACK]	2
CHLORZOXAZONE	ACTIVE MOIETY	H0DE420U8G	CHLORZOXAZONE TABLET [DIRECT RX]	2
CELLULOSE, MICROCRYSTALLINE	INACTIVE INGREDIENT	OP1R32D61U	CHLORZOXAZONE TABLET [AIDAREX PHARMACEUTICALS LLC]	2
CELLULOSE, MICROCRYSTALLINE	INACTIVE INGREDIENT	OP1R32D61U	CHLORZOXAZONE TABLET [BRYANT RANCH PREPACK]	2
CELLULOSE, MICROCRYSTALLINE	INACTIVE INGREDIENT	OP1R32D61U	CHLORZOXAZONE TABLET [DIRECT RX]	2
DOCUSATE SODIUM	INACTIVE INGREDIENT	F05Q2T2JA0	CHLORZOXAZONE TABLET [AIDAREX PHARMACEUTICALS LLC]	2
DOCUSATE SODIUM	INACTIVE INGREDIENT	F05Q2T2JA0	CHLORZOXAZONE TABLET [BRYANT RANCH PREPACK]	2
DOCUSATE SODIUM	INACTIVE INGREDIENT	F05Q2T2JA0	CHLORZOXAZONE TABLET [DIRECT RX]	2
LACTOSE MONOHYDRATE	INACTIVE INGREDIENT	EWQ57Q8I5X	CHLORZOXAZONE TABLET [AIDAREX PHARMACEUTICALS LLC]	2
LACTOSE MONOHYDRATE	INACTIVE INGREDIENT	EWQ57Q8I5X	CHLORZOXAZONE TABLET [DIRECT RX]	2
LACTOSE MONOHYDRATE	INACTIVE INGREDIENT	EWQ57Q8I5X	CHLORZOXAZONE TABLET [BRYANT RANCH PREPACK]	2
MAGNESIUM STEARATE	INACTIVE INGREDIENT	70097M6I30	CHLORZOXAZONE TABLET [DIRECT RX]	2
MAGNESIUM STEARATE	INACTIVE INGREDIENT	70097M6I30	CHLORZOXAZONE TABLET [AIDAREX PHARMACEUTICALS LLC]	2
MAGNESIUM STEARATE	INACTIVE INGREDIENT	70097M6I30	CHLORZOXAZONE TABLET [BRYANT RANCH PREPACK]	2
SODIUM BENZOATE	INACTIVE INGREDIENT	OJ245FE5EU	CHLORZOXAZONE TABLET [DIRECT RX]	2
SODIUM BENZOATE	INACTIVE INGREDIENT	OJ245FE5EU	CHLORZOXAZONE TABLET [BRYANT RANCH PREPACK]	2
SODIUM BENZOATE	INACTIVE INGREDIENT	OJ245FE5EU	CHLORZOXAZONE TABLET [AIDAREX PHARMACEUTICALS LLC]	2
SODIUM STARCH GLYCOLATE TYPE A POTATO	INACTIVE INGREDIENT	5856J3G2A2	CHLORZOXAZONE TABLET [BRYANT RANCH PREPACK]	2
SODIUM STARCH GLYCOLATE TYPE A POTATO	INACTIVE INGREDIENT	5856J3G2A2	CHLORZOXAZONE TABLET [DIRECT RX]	2
SODIUM STARCH GLYCOLATE TYPE A POTATO	INACTIVE INGREDIENT	5856J3G2A2	CHLORZOXAZONE TABLET [AIDAREX PHARMACEUTICALS LLC]	2
STARCH, CORN	INACTIVE INGREDIENT	O8232NY3SJ	CHLORZOXAZONE TABLET [BRYANT RANCH PREPACK]	2
STARCH, CORN	INACTIVE INGREDIENT	O8232NY3SJ	CHLORZOXAZONE TABLET [AIDAREX PHARMACEUTICALS LLC]	2
STARCH, PREGELATINIZED CORN	INACTIVE INGREDIENT	O8232NY3SJ	CHLORZOXAZONE TABLET [DIRECT RX]	2
CHLORZOXAZONE	ACTIVE INGREDIENT	H0DE420U8G	CHLORZOXAZONE TABLET [PROFICIENT RX LP]	1
CHLORZOXAZONE	ACTIVE MOIETY	H0DE420U8G	CHLORZOXAZONE TABLET [PROFICIENT RX LP]	1
CELLULOSE, MICROCRYSTALLINE	INACTIVE INGREDIENT	OP1R32D61U	CHLORZOXAZONE TABLET [PROFICIENT RX LP]	1
DOCUSATE SODIUM	INACTIVE INGREDIENT	F05Q2T2JA0	CHLORZOXAZONE TABLET [PROFICIENT RX LP]	1
LACTOSE MONOHYDRATE	INACTIVE INGREDIENT	EWQ57Q8I5X	CHLORZOXAZONE TABLET [PROFICIENT RX LP]	1
MAGNESIUM STEARATE	INACTIVE INGREDIENT	70097M6I30	CHLORZOXAZONE TABLET [PROFICIENT RX LP]	1
SODIUM BENZOATE	INACTIVE INGREDIENT	OJ245FE5EU	CHLORZOXAZONE TABLET [PROFICIENT RX LP]	1
SODIUM STARCH GLYCOLATE TYPE A POTATO	INACTIVE INGREDIENT	5856J3G2A2	CHLORZOXAZONE TABLET [PROFICIENT RX LP]	1
STARCH, CORN	INACTIVE INGREDIENT	O8232NY3SJ	CHLORZOXAZONE TABLET [PROFICIENT RX LP]	1

DailyMed Dashboard NDC Coverage#

NDC, Dashboard title, SPL version table
NDC	Dashboard title	SPL version	Validation	Dashboard ZIP
0591-2520	CHLORZOXAZONE TABLET [ACTAVIS PHARMA, INC.]	14	Current NDC, Legacy NDC, 2 package rows	20240925_2f05e8e2-616f-475b-ac9f-c42e1a5dbe81.zip

openFDA label cross-check#

OpenFDA label data provides additional search and identifier links. DailyMed’s Structured Product Label is the canonical label on FDA.report. Matching records are deduplicated before they are shown below.

Matched openFDA labels page 1 of 1 · 5 matching rows.

Brand, Generic, Manufacturer table
Brand	Generic	Manufacturer	SPL set ID	Effective date	Available safety fields	Join
Chlorzoxazone	CHLORZOXAZONE	PD-Rx Pharmaceuticals, Inc.	8650d342-92df-48d7-9f3d-cdd6f6f4c0e7	2025-10-20	Warnings, Adverse reactions	Exact identifier application applno (ANDA): 089859 application number: ANDA089859
Chlorzoxazone	CHLORZOXAZONE	Bryant Ranch Prepack	5e6889c9-a091-4622-0a00-ad0fc1830f78	2024-10-08	Warnings, Adverse reactions	Exact identifier application applno (ANDA): 089859 application number: ANDA089859
Chlorzoxazone	CHLORZOXAZONE	Actavis Pharma, Inc.	2f05e8e2-616f-475b-ac9f-c42e1a5dbe81	2024-08-25	Warnings, Adverse reactions	Exact identifier application applno (ANDA): 089859 application number: ANDA089859 ndc (product): 0591-2520
Chlorzoxazone	CHLORZOXAZONE	A-S Medication Solutions	6c418b8f-4a1c-4611-80d5-3a3a7dbca9c8	2023-03-08	Warnings, Adverse reactions	Exact identifier application applno (ANDA): 089859 application number: ANDA089859
Chlorzoxazone	CHLORZOXAZONE	Proficient Rx LP	63338935-f3dd-4ef1-bb66-856a83c95f41	2022-04-01	Warnings, Adverse reactions	Exact identifier application applno (ANDA): 089859 application number: ANDA089859

UNII, Preferred term, Registry number table
UNII	Preferred term	Registry number	Matched term
H0DE420U8G	CHLORZOXAZONE	95-25-0	CHLORZOXAZONE

DailyMed RxNorm Mappings#

RxCUI, RxNorm string, TTY table
RxCUI	RxNorm string	TTY	DailyMed	SPL version
197502	chlorzoxazone 500 MG Oral Tablet	PSN	8650d342-92df-48d7-9f3d-cdd6f6f4c0e7	30
197502	chlorzoxazone 500 MG Oral Tablet	SCD	8650d342-92df-48d7-9f3d-cdd6f6f4c0e7	30
197502	chlorzoxazone 500 MG Oral Tablet	PSN	6c418b8f-4a1c-4611-80d5-3a3a7dbca9c8	21
197502	chlorzoxazone 500 MG Oral Tablet	SCD	6c418b8f-4a1c-4611-80d5-3a3a7dbca9c8	21
197502	chlorzoxazone 500 MG Oral Tablet	PSN	2f05e8e2-616f-475b-ac9f-c42e1a5dbe81	15
197502	chlorzoxazone 500 MG Oral Tablet	SCD	2f05e8e2-616f-475b-ac9f-c42e1a5dbe81	15
197502	chlorzoxazone 500 MG Oral Tablet	PSN	75305abd-a545-401e-8ab7-c9c5edfc91f1	14
197502	chlorzoxazone 500 MG Oral Tablet	SCD	75305abd-a545-401e-8ab7-c9c5edfc91f1	14
197502	chlorzoxazone 500 MG Oral Tablet	PSN	5e6889c9-a091-4622-0a00-ad0fc1830f78	9
197502	chlorzoxazone 500 MG Oral Tablet	SCD	5e6889c9-a091-4622-0a00-ad0fc1830f78	9
197502	chlorzoxazone 500 MG Oral Tablet	PSN	0ed64990-f2f2-40e9-be91-874f0a862f83	6
197502	chlorzoxazone 500 MG Oral Tablet	SCD	0ed64990-f2f2-40e9-be91-874f0a862f83	6
197502	chlorzoxazone 500 MG Oral Tablet	PSN	63338935-f3dd-4ef1-bb66-856a83c95f41	5
197502	chlorzoxazone 500 MG Oral Tablet	PSN	3c3c0279-a570-4ded-9f52-5ef345a6753b	5
197502	chlorzoxazone 500 MG Oral Tablet	SCD	63338935-f3dd-4ef1-bb66-856a83c95f41	5
197502	chlorzoxazone 500 MG Oral Tablet	SCD	3c3c0279-a570-4ded-9f52-5ef345a6753b	5
197502	chlorzoxazone 500 MG Oral Tablet	PSN	9437b8ac-4f0e-4e5d-b699-23c492bf28ab	3
197502	chlorzoxazone 500 MG Oral Tablet	SCD	9437b8ac-4f0e-4e5d-b699-23c492bf28ab	3
197502	chlorzoxazone 500 MG Oral Tablet	PSN	63f43b2a-dd5b-482c-a00c-7643d91c2292	2
197502	chlorzoxazone 500 MG Oral Tablet	SCD	63f43b2a-dd5b-482c-a00c-7643d91c2292	2
197502	chlorzoxazone 500 MG Oral Tablet	PSN	720357e2-6f14-737d-e053-2a95a90ae54b	1
197502	chlorzoxazone 500 MG Oral Tablet	SCD	720357e2-6f14-737d-e053-2a95a90ae54b	1

Packages#

Package NDC, 11-digit format, Description table
Package NDC	11-digit format	Description	Units	Marketing start	Marketing end	Sample	Exclude flag	Status
0591-2520-00	00591252000	14080 TABLET in 1 BOX (0591-2520-00)	14080 tablet	22-AUG-11				Current
0591-2520-01	00591252001	100 TABLET in 1 BOTTLE, PLASTIC (0591-2520-01)	100 tablet	2011-08-22	0000-00-00	No	No	Current
0591-2520-05	00591252005	500 TABLET in 1 BOTTLE, PLASTIC (0591-2520-05)	500 tablet	2011-08-22	0000-00-00	No	No	Current
0591-2520-77	00591252077	16896 TABLET in 1 CONTAINER (0591-2520-77)	16896 tablet	22-JUL-24				Current

Title, Manufacturer, Effective date table
Title	Manufacturer	Effective date	Type	Version
Chlorzoxazone Tablets, USP Rx only	PD-Rx Pharmaceuticals, Inc.	2025-10-20	HUMAN PRESCRIPTION DRUG LABEL	30
Chlorzoxazone Tablets, USP 500 mg Revised: March 2015 Rx only 195609-1	St. Mary's Medical Park Pharmacy	2024-12-12	HUMAN PRESCRIPTION DRUG LABEL	3
Chlorzoxazone Tablets, USP Rx only	Bryant Ranch Prepack	2024-10-08	HUMAN PRESCRIPTION DRUG LABEL	9
Chlorzoxazone Tablets, USP Rx only	Actavis Pharma, Inc.	2024-08-25	HUMAN PRESCRIPTION DRUG LABEL	15
Chlorzoxazone Tablets, USP 500 mg Revised: March 2015 Rx only 195609-1	RPK Pharmaceuticals, Inc.	2023-06-07	HUMAN PRESCRIPTION DRUG LABEL	5
Chlorzoxazone Tablets, USP 500 mg Revised: March 2015 Rx only 195609-1	A-S Medication Solutions	2023-03-08	HUMAN PRESCRIPTION DRUG LABEL	21
CHLORZOXAZONE	DIRECT RX	2022-10-11	HUMAN PRESCRIPTION DRUG LABEL	6
Chlorzoxazone Tablets, USP 500 mg Revised: March 2015 Rx only 195609-1	REMEDYREPACK INC.	2022-06-20	HUMAN PRESCRIPTION DRUG LABEL	7
CHLORZOXAZONE TABLETS, USP 500 mg Revised: November 2010 Rx only 195609	Proficient Rx LP	2022-04-01	HUMAN PRESCRIPTION DRUG LABEL	5
Chlorzoxazone Tablets, USP 500 mg Revised: March 2015 Rx only 195609-1	REMEDYREPACK INC.	2022-01-28	HUMAN PRESCRIPTION DRUG LABEL	4
CHLORZOXAZONE TABLETS, USP 500 mg Revised: November 2010 Rx only 195609	Lake Erie Medical DBA Quality Care Products LLC	2021-01-22	HUMAN PRESCRIPTION DRUG LABEL	3140
Chlorzoxazone Tablets, USP 500 mg Revised: March 2015 Rx only 195609-1	A-S Medication Solutions	2020-01-27	HUMAN PRESCRIPTION DRUG LABEL	14
Chlorzoxazone Tablets, USP 500 mg Revised: March 2015 Rx only 195609-1	NuCare Pharmaceuticals, Inc.	2020-01-21	HUMAN PRESCRIPTION DRUG LABEL	2
Chlorzoxazone Tablets, USP 500 mg Revised: March 2015 Rx only 195609-1	Medsource Pharmaceuticals	2018-07-27	HUMAN PRESCRIPTION DRUG LABEL	1
CHLORZOXAZONE TABLETS, USP 500 mg Revised: November 2010 Rx only 195609	Aidarex Pharmaceuticals LLC	2012-09-14	HUMAN PRESCRIPTION DRUG LABEL	2
CHLORZOXAZONE TABLETS, USP 500 mg Revised: November 2010 Rx only 195609	Rebel Distributors Corp \| PSS World Medical, Inc. \| STAT RX USA LLC \| Dispensing Solutions, Inc. \| SCRIPT PAK \| Keltman Pharmaceuticals, Inc. \| Rebel Distirbutors Corp.	2012-01-24	HUMAN PRESCRIPTION DRUG LABEL	3