Indications and uses
The gradual bleaching of hyperpigmented skin conditions such as chloasma, melasma, freckles, senile lentigines, and other unwanted areas of melanin hyperpigmentation.
The gradual bleaching of hyperpigmented skin conditions such as chloasma, melasma, freckles, senile lentigines, and other unwanted areas of melanin hyperpigmentation.
A thin application should be applied once or twice daily or as directed by a physician. If no improvement is seen after three (3) months of treatment, use of this product should be discontinued. Sun exposure should be limited by using a sunscreen agent or protective clothing to cover bleached skin when using and after using this product in order to prevent darkening from reoccurring.
WELCOME TO THE OBAGI-C® RX SYSTEM OF SKIN CARE PRODUCTS!
For Topical Use Only
Complete skin care regimen formulated with 4% hydroquinone to reduce hyperpigmentation and other essential ingredients to help address the signs of skin aging caused by photoaging.
Please read this product information prior to use of the Obagi-C® Rx System. Any questions regarding your particular skin care regimen should be directed to your physician. More information about the Obagi-C® Rx System or other Obagi systems is available at our website at
www.obagi.com.
Rx only
FOR EXTERNAL USE ONLY
Each gram of Obagi-C® Rx System C-Clarifying Serum for Normal to Dry Skin contains:
Active: Hydroquinone, USP 4% (40 mg per g)
Inactives: ascorbic acid, propylene carbonate, propylene glycol, sodium lauryl sulfate, water
Each gram of Obagi-C® Rx System C-Clarifying Serum for Normal to Oily Skin contains:
Active: Hydroquinone, USP 4% (40 mg per g)
Inactives: ascorbic acid, dipropylene glycol, fragrance, propylene carbonate, propylene glycol, SD alcohol-39-C, sodium lauryl sulfate, water
Each gram of Obagi-C® Rx System C-Therapy Night Cream contains:
Active: Hydroquinone, USP 4% (40 mg per g)
Inactives: ascorbic acid, BHT, cetyl alcohol, disodium EDTA, glycerin, lactic acid, methylparaben, phenyl trimethicone, PPG-2 myristyl ether propionate, propylparaben, saponins, sodium lauryl sulfate, sodium metabisulfite, TEA-salicylate, tocopheryl acetate, water
Hydroquinone is 1,4-benzenediol. Hydroquinone occurs as fine, white needles. The drug is freely soluble in water and in alcohol. Chemically, hydroquinone is designated as p-dihydroxybenzene; the empirical formula is C6H6O2; molecular weight is 110.11 g per mol.
The chemical structure is in the diagram.

Topical application of hydroquinone produces a reversible depigmentation of the skin by inhibition of the enzymatic oxidation of tyrosine to 3, 4-dihydroxyphenylalanine (DOPA) and suppression of other melanocyte metabolic processes. Exposure to sunlight or ultraviolet light will cause repigmentation of the bleached areas, which may be prevented by the use of sunscreen agents contained in the Obagi-C® Rx System Sun Shield Matte Broad Spectrum SPF 50.
The gradual bleaching of hyperpigmented skin conditions such as chloasma, melasma, freckles, senile lentigines, and other unwanted areas of melanin hyperpigmentation.
A thin application should be applied once or twice daily or as directed by a physician. If no improvement is seen after three (3) months of treatment, use of this product should be discontinued. Sun exposure should be limited by using a sunscreen agent or protective clothing to cover bleached skin when using and after using this product in order to prevent darkening from reoccurring.
• Hydroquinone is a skin-bleaching agent, which may produce unwanted cosmetic effects if not used as directed. The physician should be familiar with the contents of this insert before prescribing or dispensing this product.
• Test for skin sensitivity before using by applying a small amount to an unbroken patch of skin and check within 24 hours. Minor redness is not a contraindication, but where there is itching or vesicle formation or excessive inflammatory response, the product should be discontinued and a physician consulted. Close patient supervision is recommended.
• Avoid contact with eyes, nose, mouth, and lips. In case of accidental contact, the patient should rinse thoroughly with water and contact a physician.
• Sunscreen use is an essential aspect of hydroquinone therapy because even minimal sunlight exposure sustains melanocytic activity.
The Obagi-C® Rx System C-Therapy Night Cream contains sodium metabisulfite, a sulfite that may cause allergic-type reactions including anaphylactic symptoms and life-threatening or less severe asthmatic episodes in certain susceptible people. The overall prevalence of sulfite sensitivity in the general population is unknown and probably low. Sulfite sensitivity is seen more frequently in asthmatic than in nonasthmatic people.
(See WARNINGS .)
Treatment should be limited to relatively small areas of the body at one time since some patients experience a transient skin reddening and a mild burning sensation, which does not preclude treatment.
Pregnancy Category C
Animal reproduction studies have not been conducted with topical hydroquinone. It is also not known whether hydroquinone can cause fetal harm when used topically on a pregnant woman or affect reproductive capacity. It is not known to what degree, if any, topical hydroquinone is absorbed systemically. Topical hydroquinone should be used on pregnant women only when clearly indicated.
It is not known whether topical hydroquinone is absorbed or excreted in human milk. Caution is advised when topical hydroquinone is used by a nursing mother.
Safety and effectiveness in children, below the age of 12 years, have not been established.
No systemic adverse reactions have been reported. Occasional hypersensitivity (localized contact dermatitis) may occur, in which case the product should be discontinued and physician notified immediately.
To report SUSPECTED ADVERSE REACTIONS, contact Obagi Medical Products, a division of Valeant Pharmaceuticals North America LLC, at 1-800-321-4576 or FDA at 1-800-FDA-1088 or
www.fda.gov/medwatch.
People with prior history of sensitivity or allergic reaction to this product or any of its ingredients should not use it. The safety of topical hydroquinone use during pregnancy or in children (12 years and under) has not been established.
Obagi-C® Rx System C-Clarifying Serum
(Hydroquinone, USP 4%) for Normal to Dry Skin is available as follows:
1 fl. oz. (30 mL) bottle
NDC 62032-106-10
Obagi-C® Rx System C-Clarifying Serum
(Hydroquinone, USP 4%) for Normal to Oily Skin is available as follows:
1 fl. oz. (30 mL) bottle
NDC 62032-122-10
Obagi-C® Rx System C-Therapy Night Cream
(Hydroquinone, USP 4%) is available as follows:
Net wt. 2 oz. (57 g) bottle
NDC 62032-105-36
Store at controlled room temperature: 15° to 25°C (59° to 77°F). Keep out of direct sunlight.
Distributed by:
Obagi Medical Products, Inc., a division of Valeant Pharmaceuticals North America LLC
Bridgewater, NJ 08807 USA
U.S. Patent 6,299,889
Obagi-C is a trademark of Valeant Pharmaceuticals International, Inc. or its affiliates.
©OMP, Inc.
9578900
Revised: 10/2016
| Class | Version | Type | Effective |
|---|---|---|---|
| HYDROQUINONE Pharmacologic Class Indexing | 2 | Indexing - Pharmacologic Class | 20180813 |
| Product concept | Relation | Version | Effective |
|---|---|---|---|
| c5cd4727-ac49-4409-82b1-5bd8006c3ec7 | Product name | 1 | 20171122 |
| 85490a6b-2306-6bf2-c51b-eb63537dc2da | Product name | 1 | 20140508 |
| NDC | Effective | Action | Document | Indexing SPL | Related label |
|---|---|---|---|---|---|
| 62032-106-10 | 2025-03-05 | C162847 | 48780-1 | 2cef2736-8af0-d83d-e063-dadaa90ab31f | OBAGI-C ® RX SYSTEM |
| 62032-106-10 | 2025-01-30 | C162847 | 48780-1 | 2cef2736-8af0-d83d-e063-dadaa90ab31f | OBAGI-C ® RX SYSTEM |
| Package NDC | Product | Description | Form | Quantity | Strength | SPL version |
|---|---|---|---|---|---|---|
| 62032-106-10 | OBAGI C RX system C CLARIFYING SERUM | 30 mL in 1 BOTTLE, GLASS | SOLUTION | 30 | 7 | |
| 62032-106-10 | OBAGI C RX system C CLARIFYING SERUM | 1 in 1 CARTON | SOLUTION | 1 | 7 |
| Ingredient | Type | UNII | SPL version | Uploaded |
|---|---|---|---|---|
| HYDROQUINONE | ACTIVE INGREDIENT | XV74C1N1AE | 3 | |
| HYDROQUINONE | ACTIVE MOIETY | XV74C1N1AE | 3 | |
| ASCORBIC ACID | INACTIVE INGREDIENT | PQ6CK8PD0R | 3 | |
| PROPYLENE CARBONATE | INACTIVE INGREDIENT | 8D08K3S51E | 3 | |
| PROPYLENE GLYCOL | INACTIVE INGREDIENT | 6DC9Q167V3 | 3 | |
| SODIUM LAURYL SULFATE | INACTIVE INGREDIENT | 368GB5141J | 3 | |
| WATER | INACTIVE INGREDIENT | 059QF0KO0R | 3 |
Every source-derived product name is available through these pages.
| Product NDC | Package NDC |
|---|---|
| 62032-106 | 62032-106-10 |
Every source-derived ingredient row is available through these pages.
| Name | UNII | Kind |
|---|---|---|
| HYDROQUINONE | XV74C1N1AE | ACTIB |
| ASCORBIC ACID | PQ6CK8PD0R | IACT |
| PROPYLENE CARBONATE | 8D08K3S51E | IACT |
| PROPYLENE GLYCOL | 6DC9Q167V3 | IACT |
| SODIUM LAURYL SULFATE | 368GB5141J | IACT |
| WATER | 059QF0KO0R | IACT |
Inactive Ingredient Database values describe FDA-listed use contexts. The match method and ambiguity count are shown because ingredient names, routes, and dosage forms are not always unique. Browse recovered IID releases and source provenance.
| DailyMed ingredient | IID ingredient | UNII | Dosage form / route | Potency | Maximum daily exposure | Match |
|---|---|---|---|---|---|---|
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | CREAM / TOPICAL | 214 mg | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | SPONGE / TOPICAL | 5 %w/w | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | SPRAY / TOPICAL | 7 mg | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | LOTION / TOPICAL | 111 mg | ||
| PROPYLENE GLYCOL | PROPYLENE GLYCOL | 6DC9Q167V3 | SOLUTION / TOPICAL | 4886 mg | ||
| PROPYLENE CARBONATE | PROPYLENE CARBONATE | 8D08K3S51E | OINTMENT / TOPICAL | 3000 mg | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | GEL / TOPICAL | 0.05 %w/w | ||
| ASCORBIC ACID | ASCORBIC ACID | PQ6CK8PD0R | SOLUTION / TOPICAL | 0.04 %w/w | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | OINTMENT / TOPICAL | 14 mg | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | GEL / TOPICAL | 0.05 %w/w | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | SHAMPOO, SUSPENSION / TOPICAL | 40 %w/v | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | SPONGE / TOPICAL | 5 %w/w | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | CREAM / TOPICAL | 214 mg | ||
| PROPYLENE GLYCOL | PROPYLENE GLYCOL | 6DC9Q167V3 | SOLUTION / TOPICAL | 4886 mg | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | LOTION / TOPICAL | 111 mg | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | SHAMPOO / TOPICAL | 65 %w/w | ||
| PROPYLENE CARBONATE | PROPYLENE CARBONATE | 8D08K3S51E | OINTMENT / TOPICAL | 3000 mg | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | SHAMPOO / TOPICAL | 65 %w/w | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | SHAMPOO, SUSPENSION / TOPICAL | 40 %w/v | ||
| ASCORBIC ACID | ASCORBIC ACID | PQ6CK8PD0R | SOLUTION / TOPICAL | 0.04 %w/w | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | OINTMENT / TOPICAL | 14 mg | ||
| SODIUM LAURYL SULFATE | SODIUM LAURYL SULFATE | 368GB5141J | SPRAY / TOPICAL | 7 mg |
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.
| Brand | Generic | Manufacturer | SPL set ID | Effective date | Available safety fields | Join |
|---|---|---|---|---|---|---|
| Obagi-C C-Rx System Normal-Dry Skin Intervention | HYDROQUINONE, HOMOSALATE, OCTISALATE, ZINC OXIDE | Obagi Cosmeceuticals LLC | ca931d1c-4df4-47ce-8d5c-cd8c3e38c02b | 2026-01-26 | Warnings | 62032-106-10 62032010610 |
| Obagi-C C-Rx System Normal-Dry Skin Intervention | HYDROQUINONE, TITANIUM DIOXIDE, ZINC OXIDE | Obagi Cosmeceuticals LLC | e9d8488f-b902-45f4-a6d6-c6eb393c8f08 | 2025-11-13 | Warnings | 62032-106-10 62032010610 |
| OBAGI C RX system C CLARIFYING SERUM | HYDROQUINONE | Obagi Cosmeceuticals LLC | 9ff4f617-b8d3-46d6-8ddb-41088dd8f226 | 2025-01-01 | Warnings, Adverse reactions | 62032-106-10 62032-106 62032010610 83215733-be55-48e1-95dc-2884132042d2 9ff4f617-b8d3-46d6-8ddb-41088dd8f226 |
Adverse event summaries are temporarily unavailable. Other product information remains available.