Carbamide peroxide



Carbamide peroxide is a medication used to loosen ear wax, whiten teeth, and clean oral wounds.

Brand Names
Auro Ear, Gly-oxide, Murine Ear
Generic Name
Carbamide peroxide
DrugBank Accession Number

Carbamide peroxide, also known as urea-hydrogen peroxide, is a water-soluble, white crystalline solid compound consisting of hydrogen peroxide and urea. As it is a source of hydrogen peroxide, it can be found in disinfecting and dental bleaching products. Some adverse effects of carbamide peroxide as a dental bleaching agent include dentin sensitivity and/or gingival irritation led by unstable and reactive H+ free radicals and low pH from prolonged use. It may also alter enamel surface morphology via enamel mineral loss and surface roughening 1. The FDA considers carbamide peroxide to be safe in oral mucosal injury drug products as an oral wound healing agent, although there is insufficient data to establish general recognition of the effectiveness of this ingredient as an oral wound healing agent 6. It is available in OTC otic drugs as non-water, non-oil-based solutions used to soften, loosen and remove excessive ear wax, or cerumen.

Small Molecule
Average: 94.07
Monoisotopic: 94.037842061
Chemical Formula
  • Carbamide peroxide
  • Hydrogen peroxide carbamide
  • Urea dioxide
  • Urea hydrogen peroxide
  • Urea peroxide



Indicated as a dental bleaching agent.

Indicated as an oral wound healing agent in oral mucosal injuries.

Indicated as an aid in the removal of hardened ear wax.

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Associated Conditions
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Carbamide peroxide releases hydrogen peroxide and free radicals upon contact with water or outer surfaces of ear and tooth. Hydrogen peroxide exerts cerumenolytic, enamel-bleaching and antiseptic actions. In vitro, the chemical stability of ceramics against bleaching agents was observed after treatment with 15% carbamide peroxide for 56 h, 16% carbamide peroxide for 126 h, 10% or 15% carbamide peroxide and 38% hydrogen peroxide for 30 minutes or 45 minutes, respectively 1. According to in vitro studies, high (37%) or low (10 or 16%) concentrated carbamide peroxide agents were similarly effective as oral bleaching agents 2. Treatment with carbamide peroxide may lead to demineralization which involves decreased mineral content of enamel calcium, phosphate, and fluoride, and alteration of the chemical, structural, and mechanical properties 3. Carbamide peroxide may affect the organic components of the enamel and lead to increased susceptibility to erosion, fracture stability or decreased abrasion resistance of the treated area 3.

Mechanism of action

Carbamide peroxide release hydrogen peroxide upon contact with teeth, which is a strong oxidizing and bleaching agent. It also release free radicals such as H+ or H3O+ 1. Hydrogen peroxide also acts as an antiseptic, especially in sites with relative anaerobiosis. Following otic administration, carbamide peroxide complex releases hydrogen peroxide that breaks up the hardened wax. The hydrogen peroxide component, which further breaks down into water, is also a cerumenolytic that hydrates the desquamated sheets of corneocytes, which are the major constituent of cerumen plugs 4. The glycerol and urea facilitates softening of the cerumen, either with or without syringing 5. Both hydrogen peroxide and urea mildly induce keratolysis with disintegration of the ear wax to help reduce the keratin-load in the ear debris and allow other active components to reach the skin under the debris 4,5.


Upon treatment into the external auditory canal or the dental cavity, exposure to carbamide peroxide is limited to the intimate contact with the treated area without any systemic absorption.

Volume of distribution

No established pharmacokinetic data.

Protein binding

No established pharmacokinetic data.


No established pharmacokinetic data.

Route of elimination

No established pharmacokinetic data.


No established pharmacokinetic data.


No established pharmacokinetic data.

Adverse Effects
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Oral LD50 in rat is >2000 mg/kg MSDS.

Not Available
Pharmacogenomic Effects/ADRs
Not Available


Drug Interactions
This information should not be interpreted without the help of a healthcare provider. If you believe you are experiencing an interaction, contact a healthcare provider immediately. The absence of an interaction does not necessarily mean no interactions exist.
Not Available
Food Interactions
No interactions found.


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Active Moieties
Hydrogen peroxideunknownBBX060AN9V7722-84-1MHAJPDPJQMAIIY-UHFFFAOYSA-N
International/Other Brands
Aquadrate / Balneum plus / Calmurid / Eucerin / Flexifoot / Flexitol / Hydromol intensive / Nutraplus / Sential E / St.James balm / Ureaphil
Brand Name Prescription Products
NameDosageStrengthRouteLabellerMarketing StartMarketing EndRegionImage
Endoperox 100%Tablet100 %DentalSeptodont1988-12-312000-08-03Canada flag
Over the Counter Products
NameDosageStrengthRouteLabellerMarketing StartMarketing EndRegionImage
Audiologists Choice Earwax Removal Aid DropsSolution / drops65 mg/1mLAuricular (otic)Oaktree Products Inc2016-06-01Not applicableUS flag
Audiologists Choice Earwax Removal SystemLiquid65 mg/1mLTopicalOaktree Products Inc.2014-11-28Not applicableUS flag
AuralytLiquid7.8 mg/12mLTopicalMenper Distributors, Inc2014-01-01Not applicableUS flag
Auro Ear Wax RemoverLiquid1.44 mL/22mLAuricular (otic)Insight Pharmaceuticals2010-07-01Not applicableUS flag
Best Choice Earwax Removal DropsSolution / drops65 mg/1mLAuricular (otic)Valu Merchandisers Company2014-11-27Not applicableUS flag
Best Choice Earwax Removal KitLiquid65 mg/1mLTopicalValu Merchandisers, Co.2014-11-27Not applicableUS flag
CareOne Earwax Removal DropsSolution / drops65 mg/1mLAuricular (otic)Retail Business Services, LLC2020-01-01Not applicableUS flag
CareOne Earwax Removal Kit, Earwax and BulbKit65 mg/1mLAuricular (otic)Retail Business Services, LLC2020-01-01Not applicableUS flag
Cleanse Right Ear Wax DropsLiquid0.065 g/1mLIrrigationBlue Echo Care2022-09-07Not applicableUS flag
Clear canal Earwax softener dropsSolution / drops6.5 mg/1mLAuricular (otic)NeilMed Pharmaceuticals, Inc.2019-02-162019-02-16US flag
Mixture Products
NameIngredientsDosageRouteLabellerMarketing StartMarketing EndRegionImage
Dr.Whitiss 15%Carbamide peroxide (150 mg/1g) + Sodium fluoride (2.5 mg/1g)Gel, dentifriceDentalNIBEC Co., Ltd.2015-06-07Not applicableUS flag
Dr.Whitiss 15%Carbamide peroxide (150 mg/1g) + Sodium fluoride (2.5 mg/1g)Gel, dentifriceDentalNIBEC Co., Ltd.2015-06-07Not applicableUS flag
Unapproved/Other Products
NameIngredientsDosageRouteLabellerMarketing StartMarketing EndRegionImage
Lutooth Tooth WhiteningCarbamide peroxide (8.3 g/100mL)KitDentalDent-White Co LTD2016-05-052016-05-06US flag
Thera-EarCarbamide peroxide (7.15 g/79.37mL)Solution / dropsTopicalHarmony Labs, Inc.2008-01-012011-04-06US flag


Drug Categories
Chemical TaxonomyProvided by Classyfire
This compound belongs to the class of organic compounds known as ureas. These are compounds containing two amine groups joined by a carbonyl (C=O) functional group.
Organic compounds
Super Class
Organic acids and derivatives
Organic carbonic acids and derivatives
Sub Class
Direct Parent
Alternative Parents
Organopnictogen compounds / Organonitrogen compounds / Organic oxides / Hydrocarbon derivatives / Carbonyl compounds
Aliphatic acyclic compound / Carbonyl group / Hydrocarbon derivative / Organic nitrogen compound / Organic oxide / Organic oxygen compound / Organonitrogen compound / Organooxygen compound / Organopnictogen compound / Urea
Molecular Framework
Aliphatic acyclic compounds
External Descriptors
mixture (CHEBI:75178)
Affected organisms
Not Available

Chemical Identifiers

CAS number
InChI Key
peroxol; urea


General References
  1. Ourique SA, Arrais CA, Cassoni A, Ota-Tsuzuki C, Rodrigues JA: Effects of different concentrations of carbamide peroxide and bleaching periods on the roughness of dental ceramics. Braz Oral Res. 2011 Sep-Oct;25(5):453-8. [Article]
  2. Meireles SS, Fontes ST, Coimbra LA, Della Bona A, Demarco FF: Effectiveness of different carbamide peroxide concentrations used for tooth bleaching: an in vitro study. J Appl Oral Sci. 2012 Mar-Apr;20(2):186-91. [Article]
  3. Bollineni S, Janga RK, Venugopal L, Reddy IR, Babu PR, Kumar SS: Role of fluoridated carbamide peroxide whitening gel in the remineralization of demineralized enamel: An in vitro study. J Int Soc Prev Community Dent. 2014 May;4(2):117-21. doi: 10.4103/2231-0762.137638. [Article]
  4. Hand C, Harvey I: The effectiveness of topical preparations for the treatment of earwax: a systematic review. Br J Gen Pract. 2004 Nov;54(508):862-7. [Article]
  5. electronic Medicines Compendium (eMC): Otex Ear Drops [Link]
  6. CFR - Code of Federal Regulations Title 21: Sec. 310.534 Drug products containing active ingredients offered over-the-counter (OTC) for human use as oral wound healing agents. [Link]
  7. DailyMed: Earwax Treatment Drops (carbamide peroxide) otic solution [Link]
PubChem Compound
PubChem Substance
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Clinical Trials

Clinical Trials
4CompletedTreatmentAtopic Dermatitis1
3CompletedTreatmentAcute Otitis Media (AOM)1
3CompletedTreatmentSensitivity, Tooth1
3RecruitingTreatmentAcute Otitis Media (AOM) / Pain1
3TerminatedTreatmentAcute Otitis Media (AOM)1
2CompletedTreatmentAcute Otitis Externa1
2CompletedTreatmentEar Diseases / Ear, Nose, and Throat (ENT) Disease / Otitis / Otitis Externa1
1Unknown StatusTreatmentChronic suppurative Otitis media1
1Unknown StatusTreatmentOtitis Media (OM)1


Not Available
Not Available
Dosage Forms
LiquidTopical7.8 mg/12mL
LiquidAuricular (otic)1.44 mL/22mL
KitAuricular (otic)65 mg/1mL
LiquidIrrigation0.065 g/1mL
Solution / dropsAuricular (otic)6.5 mg/1mL
LiquidAuricular (otic)0.065 g/1mL
LiquidTopical65 mg/1mL
LiquidAuricular (otic)0.065 mg/1mL
LiquidAuricular (otic)65 mg/1mL
SolutionTopical65 mg/1mL
Gel, dentifriceDental0.083 g/1g
Gel, dentifriceDental10 g/100g
Gel, dentifriceDental
Gel, dentifriceDental15 g/100g
Gel, dentifriceDental20 g/100g
Gel, dentifriceDental35 g/100g
KitTopical6.5 g/100mL
LiquidAuricular (otic)6.5 mg/100mL
LiquidTopical6.5 g/100mL
Solution / dropsTopical65 mg/1mL
LiquidAuricular (otic)6.5 g/100mL
Solution / dropsAuricular (otic)81.86 mg/1mL
KitAuricular (otic)6.5 g/100mL
LiquidAuricular (otic)65 g/1mL
SolutionAuricular (otic)81.86 mg/1mL
TabletDental100 %
LiquidAuricular (otic)0.065 g/1g
SolutionAuricular (otic)65 mg
Kit; solution / dropsTopical65 mg/1mL
LiquidOral0.1 mg/1mL
LiquidOral100 mg/1mL
Solution / dropsTopical6.5 g/100mL
KitTopical65 mg/1mL
KitDental8.3 g/100mL
Gel, dentifriceDental15 g/100mL
Gel, dentifriceDental8.3 g/100mL
LiquidAuricular (otic)6.5 %
Kit; solution / dropsAuricular (otic)65 mg/1mL
Solution / dropsAuricular (otic)65 mg/1mL
Solution / dropsTopical7.15 g/79.37mL
Solution / dropsAuricular (otic)6.5 g/100mL
CrystalNot applicable1 g/1g
Not Available
Not Available


Experimental Properties
melting point (°C)75-85MSDS
water solubility500 g/L at °CMSDS
Predicted Properties
Water Solubility412.0 mg/mLALOGPS
pKa (Strongest Acidic)15.73Chemaxon
pKa (Strongest Basic)-2.4Chemaxon
Physiological Charge0Chemaxon
Hydrogen Acceptor Count1Chemaxon
Hydrogen Donor Count2Chemaxon
Polar Surface Area69.11 Å2Chemaxon
Rotatable Bond Count0Chemaxon
Refractivity13.14 m3·mol-1Chemaxon
Polarizability5.1 Å3Chemaxon
Number of Rings0Chemaxon
Rule of FiveYesChemaxon
Ghose FilterNoChemaxon
Veber's RuleNoChemaxon
MDDR-like RuleNoChemaxon
Predicted ADMET Features
Not Available


Mass Spec (NIST)
Not Available
SpectrumSpectrum TypeSplash Key
Predicted MS/MS Spectrum - 10V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 20V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 40V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 10V, Negative (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 20V, Negative (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 40V, Negative (Annotated)Predicted LC-MS/MSNot Available

Drug created at December 03, 2015 16:51 / Updated at February 21, 2021 18:52