Hydroquinone
Pronunciation: hye-droh-KWIN-own.
- Generic name
- Hydroquinone
- Brand names
- Melanocyl, Obagi Clear, Eldoquin, Melalite, Solaquin, Eukroma
- Drug class
- Topical depigmenting agent (skin lightening agent)
Availability and supply rules vary by country
Trade names by country: United States · Canada
Australia: · Full directory
What Hydroquinone is and how it works
Uses, formulations, monitoring, and supply rules can differ by patient, product, and country. Follow the exact local product information and professional advice.
Mechanism of action: how Hydroquinone works
Hydroquinone inhibits the enzymatic oxidation of tyrosine to 3,4-dihydroxyphenylalanine (DOPA) and suppresses melanocyte metabolic processes, leading to decreased melanin synthesis and gradual lightening of hyperpigmented skin lesions. (1)
What Hydroquinone is used for
Hyperpigmentation
Used to gradually lighten areas of skin that have become darker than the surrounding skin. (3) (2)
Melasma
Used to lighten melasma/chloasma, patches of darkened skin often linked to pregnancy, birth control pills, or hormone therapy. (3) (2)
Freckles
Used cosmetically to lighten the appearance of freckles. (3) (2)
Age spots
Used to lighten age spots (solar lentigines) caused by sun exposure over time. (3) (2)
Post-inflammatory hyperpigmentation
Used to lighten darkened skin that remains after an injury, acne, or other skin inflammation has healed. (3) (2)
Before taking Hydroquinone
Do not take / not appropriate for
- Contraindicated in patients with known hypersensitivity to hydroquinone or formulation components, and in those with active skin infections or open wounds at the application site. (Contraindication) (3)
Tell your clinician about
(3) (2)How to take Hydroquinone
- General Instructions: Apply a thin layer to the affected area(s) of skin, usually once or twice daily as directed by your healthcare provider. Wash hands before and after application.. Adult Dosing: Apply a thin film to the affected area(s) once or twice daily. Do not exceed recommended frequency.. Pediatric Dosing: Safety and efficacy in children under 12 years have not been established. Use only under medical supervision.. Administration: Clean and dry the skin before application. Apply only to areas of hyperpigmentation, avoiding normal skin, eyes, mouth, and mucous membranes.. When To Stop: Contact your healthcare provider if you develop severe irritation, an allergic reaction, or see no improvement after 2 months, so they can advise on next steps; prolonged use (over 6 months) is generally not recommended and should be reviewed with your provider.. Storage: Store at room temperature, away from heat and light. Keep out of reach of children.
- This page does not provide a dose calculator. Dosing must follow the prescriber, pharmacist, or product label.
Procedures and treatment changes
Tell the treating team before surgery, procedures, or any medicine change. Do not alter treatment without the responsible clinician. (3) (2)
Missed dose
If you miss a dose, apply it as soon as you remember. If it is almost time for your next dose, skip the missed dose and resume your regular schedule. Do not apply extra to make up for a missed dose.
Overdose
Hydroquinone overdose from topical use is rare but may cause increased skin irritation. If accidentally ingested or large amounts are applied, seek emergency medical attention or contact a poison control center immediately. (3) (2)
Side effects
Side effects and their urgency vary; report severe, persistent, or concerning symptoms to a healthcare professional.
Skin irritation (redness, stinging, burning)
Incidence: Reported in the clinician-authored database; frequency not established
Dryness or flaking of skin
Incidence: Reported in the clinician-authored database; frequency not established
Itching
Incidence: Reported in the clinician-authored database; frequency not established
Ochronosis (darkening of the skin, especially with prolonged use)
Incidence: Reported in the clinician-authored database; frequency not established
Allergic contact dermatitis
Incidence: Reported in the clinician-authored database; frequency not established
Hypopigmentation (unintended lightening of surrounding skin)
Incidence: Reported in the clinician-authored database; frequency not established
Serious warnings
For external use only — serious
Symptoms: For external use only; do not ingest. May cause skin irritation or allergic reactions. Prolonged use may result in ochronosis (a bluish-black skin discoloration), which the FDA specifically warns may be PERMANENT. Not recommended during pregnancy or breastfeeding unless prescribed. Avoid use in children under 12 years unless directed by a healthcare provider.
Action: Follow the urgency stated and seek prompt or emergency care when indicated. (3) (2)
Some hydroquinone formulations contain sodium metabisulfite, a sulfite that can cause allergic-type reactions in susceptible people, including life-threatening or less severe asthma episodes and anaphylactic symptoms — serious
Symptoms: Some hydroquinone formulations contain sodium metabisulfite, a sulfite that can cause allergic-type reactions in susceptible people, including life-threatening or less severe asthma episodes and anaphylactic symptoms. Tell your prescriber if you have a sulfite sensitivity or asthma before starting treatment.
Action: Follow the urgency stated and seek prompt or emergency care when indicated. (3) (2)
Contraindications recorded in the clinician database — serious
Symptoms: Contraindications recorded in the clinician database: Contraindicated in patients with known hypersensitivity to hydroquinone or formulation components, and in those with active skin infections or open wounds at the application site. Use with caution in patients with a history of allergic contact dermatitis or eczema. Not recommended for use in children under 12 years or during pregnancy/breastfeeding unless clearly indicated.
Action: Follow the urgency stated and seek prompt or emergency care when indicated. (3) (2)
Interactions
| Medicine or test | Effect | Action |
|---|---|---|
| Recorded interactions | Hydroquinone may interact with products containing hydrogen peroxide, benzoyl peroxide, or other topical irritants, leading to increased skin irritation or temporary staining. Inform your healthcare provider about all topical and systemic medications you are using. | (1) |
Pregnancy, breastfeeding, kidney/liver function, age
Pregnancy
The safety of topical hydroquinone during pregnancy has not been established — no specific pregnancy risk category has been assigned because adequate safety data are lacking, not because it has been shown to be either safe or harmful. It is not recommended during pregnancy unless a healthcare provider specifically prescribes it after weighing the individual situation. (3) (2)
Breastfeeding
The safety of topical hydroquinone during breastfeeding has not been established. It is not recommended while breastfeeding unless specifically prescribed by a healthcare provider. (3) (2)
Children
Frequency: Not applicable.. Weight Based: Not recommended for pediatric use.. Max Daily Dose: Not applicable.. Max Single Dose: Not applicable.. Age Restrictions: Safety not established in children. (3) (2)
Renal_impairment
Specific renal or hepatic impairment guidance is not established for this topical medication; systemic absorption from the skin is generally low, but any concerns should be discussed with the prescribing clinician. (3) (2)
Hepatic_impairment
Specific renal or hepatic impairment guidance is not established for this topical medication; systemic absorption from the skin is generally low, but any concerns should be discussed with the prescribing clinician. (3) (2)
Monitoring
(3) (2)Storage
Store at room temperature, away from heat and light (hydroquinone can discolor/degrade with light and air exposure — keep the container tightly closed). Keep out of reach of children.
Professional information
Clinician-facing context only. This section does not replace current product labeling.
General
Indication: Hyperpigmentation
Dose summary: Apply a thin layer of hydroquinone cream to the affected area twice daily.
Renal context: No renal-impairment dosing table is established for topical hydroquinone in the sources reviewed for this page. Systemic absorption through intact skin is generally low, so no dose adjustment is specified; any renal concerns should be discussed with the prescribing clinician. (1)
Hepatic guidance
No hepatic-impairment dosing table is established for topical hydroquinone in the sources reviewed for this page. Systemic absorption through intact skin is generally low, so no dose adjustment is specified; any hepatic concerns should be discussed with the prescribing clinician.
Frequently asked questions
How long does it take for hydroquinone to work?
Visible improvement is usually seen after 4-8 weeks of consistent use, but full results may take up to 12 weeks. Sun protection is essential for best results.
Can hydroquinone be used during pregnancy or breastfeeding?
Hydroquinone is not recommended during pregnancy or breastfeeding unless specifically prescribed by a healthcare provider, due to limited safety data.
Is hydroquinone safe for long-term use?
Long-term use (over 6 months) is not recommended due to the risk of ochronosis and other side effects. Use only as directed by your healthcare provider.
What should I do if I develop severe irritation or an allergic reaction?
Contact your healthcare provider promptly if you experience severe irritation, blistering, or signs of an allergic reaction; they can advise whether to stop or continue the medicine and what to do next.
Can I use hydroquinone with other skin products?
Avoid using hydroquinone with other skin-lightening or irritating products unless directed by your healthcare provider, as this may increase the risk of side effects.
What happens if I stop using hydroquinone suddenly?
Stopping hydroquinone may result in gradual return of pigmentation. There are no withdrawal symptoms, but ongoing sun protection is important.
Is hydroquinone available over the counter?
In the United States, hydroquinone has been prescription-only at every strength since September 2020, when the FDA removed all over-the-counter hydroquinone products from the market. Availability may differ in other countries, where regulations vary. Always obtain hydroquinone through a legitimate prescription rather than an unregulated product.
What happens if I take too much Hydroquinone (dermatologic use)?
Applying excessive amounts of hydroquinone topically can lead to increased skin irritation, redness, and peeling. While systemic absorption is generally low, prolonged overuse may rarely lead to ochronosis, a bluish-black discoloration of the skin that may be permanent. If you suspect an overdose or experience severe adverse reactions, seek emergency medical attention promptly; the treating clinician will advise on whether to stop or continue the product.
Can I drink alcohol while taking Hydroquinone (dermatologic use)?
As a topical medication, hydroquinone is not known to have direct interactions with alcohol. However, alcohol consumption can sometimes exacerbate skin conditions or increase sensitivity, which might indirectly affect the skin's response to treatment. It is generally advisable to maintain good skin health practices and consult your healthcare provider if you have concerns about alcohol use during your treatment.
Is Hydroquinone (dermatologic use) safe during pregnancy?
Hydroquinone's safety during pregnancy has not been established, and current FDA-reviewed labeling does not assign it a specific pregnancy risk category — the data simply are not adequate to say whether it is safe or unsafe. Because of this uncertainty, it is not recommended during pregnancy unless a healthcare provider specifically prescribes it. Always consult your healthcare provider before using hydroquinone if you are pregnant or planning to become pregnant.
What is the mechanism of action of Hydroquinone?
Hydroquinone inhibits the enzymatic oxidation of tyrosine to 3,4-dihydroxyphenylalanine (DOPA) and suppresses melanocyte metabolic processes, leading to decreased melanin synthesis and gradual lightening of hyperpigmented skin lesions. (1)
What is the generic name of Hydroquinone?
The generic name is Hydroquinone. It is sold under brand names including Melanocyl, Obagi Clear, Eldoquin, Melalite, Solaquin, Eukroma.
What class of drug is Hydroquinone?
Hydroquinone is classed as: Topical depigmenting agent (skin lightening agent).
References
- Hydroquinone (dermatologic use) — clinician-authored medicine recordMedGuideGlobal · Global · accessed 2026-08-06 · source 1
- FDA works to protect consumers from potentially harmful OTC skin lightening productsU.S. Food and Drug Administration · United States · dated 2020-09-23 · accessed 2026-08-06 · source 2
- Hydroquinone 4% cream prescribing information — DailyMedU.S. Food and Drug Administration · United States · accessed 2026-08-06 · source 3
- HYDROQUINONE 4% (HYDROQUINONE) CREAM [ACELLA PHARMACEUTICALS, LLC] — US prescribing information (DailyMed SPL)U.S. National Library of Medicine (DailyMed) · US · accessed 2026-08-14 · source 4
- Hydroquinone — RxNorm normalized drug concept (RXCUI 5509)U.S. National Library of Medicine (RxNorm) · US · accessed 2026-08-14 · source 5
Brand names by country
Single-ingredient Hydroquinone names are shown separately by country. Product availability, strengths, and supply rules can change; combination products are not included here.
Priority countries
United States
- Obagi-C Rx system C-Therapy Night Skin Lightening with Vitamins C and E40 mg/g · obagi cosmeceuticals llc
- OBAGI C RX system C CLARIFYING SERUM40 mg/mL · obagi cosmeceuticals llc
- Hydro-Q40 mg/g · dermavance pharmaceuticals
- ZO Skin Health Pigment Control Plus Blending Creme Hydroquinone.04 g/mL · zo skin health, inc.
- ZO Skin Health Pigment Control Creme Hydroquinone40 mg/mL · zo skin health, inc.
- OLIVIA QUIDO BLEMISH ERASER.02 g/g · o skin care llc
- ZO Skin Health Pigment Control plus Brightening Creme Hydroquinone plus Vitamin C.04 mg/mL · zo skin health, inc.
- NU-DERM CLEAR Skin Bleaching and Corrector40 mg/g · obagi cosmeceuticals llc
- OBAGI-C Rx system C-CLARIFYING SERUM NORMAL TO oily SKIN LIGHTENING SERUM WITH VITAMIN C40 mg/mL · obagi cosmeceuticals llc
- NU-DERM BLENDER Skin Lightener and Blending40 mg/g · obagi cosmeceuticals llc
Canada
- CORRECTOR
- VANTEX SKIN BLEACHING CRM W SUNSCREEN
- ADVANCED SKIN LIGHTENING SERUM
- LUSTRA
- SEEQUIN 4 IDS
- ACTIVE