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.
store at controlled room temperature: 15°C–25°C (59°F–77°F) protect this product from excessive heat and direct sun
WELCOME TO THE OBAGI-C® Rx SYSTEM OF SKIN CARE PRODUCTS!
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 on 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 metabisulfate, 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.
The Obagi-C® Rx System C-Therapy Night Cream contains sodium metabisulfite, a sulfite that may cause allergic-type reactions including anaphylactic symptoms and lifethreatening 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.
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 Cosmeceuticals LLC, at 1-800-636-7546 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.
(Hydroquinone, USP 4%) for Normal to Dry Skin is available as follows:
1 fl. oz. (30 mL) bottle
NDC 62032-106-10
(Hydroquinone, USP 4%) for Normal to Oily Skin is available as follows:
1 fl. oz. (30 mL) bottle
NDC 62032-122-10
(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 Cosmeceuticals LLC, Long Beach, CA 90806
U.S. Patent 6,299,889
All products/brand names, whether designated by notice or not (®/TM), are trademarks of Obagi Cosmeceuticals LLC and/or its affiliates.
©2019 Obagi Cosmeceuticals LLC.
All rights reserved.
9578903 Revised: 1/2019
Drug Facts
| Active ingredients | Purpose |
|---|---|
| Homosalate 10% | Sunscreen |
| Octisalate 5% | Sunscreen |
| Zinc Oxide 16.5% | Sunscreen |
For external use only
Do not use on damaged or broken skin
Stop use and ask a doctor if rash occurs
When using this product keep out of eyes. Rinse with water to remove.
Keep out of reach of children. If swallowed, get medical help or contact a Poison Control Center right away.
Water (Aqua), C15-19 Alkane, Octyldodecyl Neopentanoate, Polymethylsilsesquioxane, Sorbitan Olivate, Silica, Polyglyceryl-6 Polyrininoleate, Sodium Chloride, Xanthan Gum, Glycerin, Hydroxyacetophenone, Disodium EDTA, 1,2-Hexanediol, Caprylyl Glycol, Sodium Hydroxide, Triethoxycaprylsilane, Polyhydroxystearic Acid, Disteardimonium Hectorite, Polyglyceryl-2 Isostearate, Euphorbia Cerifera (candelilla) Wax, Beeswax, Dimethicone
1.800.636.7546
Monday–Friday 9 a.m.–4 p.m. Pacific Time
Distributed by Obagi Cosmeceuticals LLC,
Long Beach, CA 90806
| 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 |
|---|---|---|---|---|---|
| 62032-534-04 | 2025-01-30 | C162847 | 48780-1 | f386c64a-338e-0266-e053-dadaa90a7c1a | OBAGI-C ® RX SYSTEM |
| 62032-534-04 | 2023-02-02 | C162847 | 48780-1 | f386c64a-338e-0266-e053-dadaa90a7c1a | OBAGI-C ® RX SYSTEM |
| 62032-534-04 | 2023-01-30 | C162847 | 48780-1 | f386c64a-338e-0266-e053-dadaa90a7c1a | OBAGI-C ® RX SYSTEM |
| Package NDC | Product | Description | Form | Quantity | Strength | SPL version |
|---|---|---|---|---|---|---|
| 62032-534-04 | OBAGI-C RX system NORMAL-oily SKIN INTERVENTION | 1 in 1 KIT | KIT | 1 | 3 |
| NDC | Dashboard title | SPL version | Validation | Dashboard ZIP |
|---|---|---|---|---|
| 62032-534 | OBAGI-C RX SYSTEM NORMAL-OILY SKIN INTERVENTION (HYDROQUINONE, HOMOSALATE, OCTISALATE AND ZINC OXIDE) KIT [OBAGI COSMECEUTICALS LLC] | 3 | Legacy NDC, 1 package rows | 20230203_b31837f7-721f-484e-89d5-4ad84ad0f400.zip |
Every source-derived product name is available through these pages.
| Product NDC | Package NDC |
|---|---|
| 62032-534 | 62032-534-04 |
Every source-derived ingredient row is available through these pages.
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 |
|---|---|---|---|---|---|---|
| 79f3240f-32ed-4063-b6a5-df7ae4eba3ab | b31837f7-721f-484e-89d5-4ad84ad0f400 | 2023-01-26 | Warnings, Adverse reactions | 79f3240f-32ed-4063-b6a5-df7ae4eba3ab b31837f7-721f-484e-89d5-4ad84ad0f400 |
Adverse event summaries are temporarily unavailable. Other product information remains available.