Hydrogen Peroxide 3%

Hydrogen peroxide

Oral Emetic, Topical AntisepticPOtopicalDogsCatsFerretsSwine

Also known as: Hydrogen Peroxide 3% Solution · Dilute hydrogen peroxide solution · Hydrogen peroxide solution 10-volume · Hydrogen peroxide topical solution

Reviewed by the VetSheet Veterinary TeamUpdated Apr 5, 2026Evidence-based veterinary reference

1 teaspoon (5 mL) per 5 lbs. (2.3 kg) of body weight (approximately 2 mL/kg) not to exceed 3 tablespoons (45 mL).PO· can be repeated once if not initially successful

Body weight— 🐕

Doses are a clinical reference for licensed veterinary professionals. Always confirm against the current label and the individual patient.

Dosing by species

🌎 NA — North America🌍 EU — Europe

Dogs

Indication	Dose	Route	Frequency	Duration	Region
As an emetic	1 teaspoon (5 mL) per 5 lbs. (2.3 kg) of body weight (approximately 2 mL/kg) not to exceed 3 tablespoons (45 mL).	PO	can be repeated once if not initially successful	—	🌎 NA
As an emetic	1-2 mL/kg PO up to 2-3 times	PO	up to 2-3 times	—	🌎 NA
As an emetic	1-5 mL/kg PO; generally not to exceed 50 mL for dogs and 10 mL for cats; may repeat one time if after 10 minutes emesis does not occur.	PO	may repeat one time if after 10 minutes emesis does not occur	—	🌎 NA

As an emetic: Vomiting usually occurs within minutes.
As an emetic: Inducing emesis is most effective if administered after a small meal.

Cats

Indication	Dose	Route	Frequency	Duration	Region
As an emetic	1 teaspoon (5 mL) per 5 lbs. (2.3 kg) of body weight (approximately 2 mL/kg) not to exceed 3 tablespoons (45 mL).	PO	can be repeated once if not initially successful	—	🌎 NA
As an emetic	1-2 mL/kg PO up to 2-3 times	PO	up to 2-3 times	—	🌎 NA
As an emetic	1-5 mL/kg PO; generally not to exceed 50 mL for dogs and 10 mL for cats; may repeat one time if after 10 minutes emesis does not occur.	PO	may repeat one time if after 10 minutes emesis does not occur	—	🌎 NA

As an emetic: Vomiting usually occurs within minutes. Note: Use in cats is generally discouraged due to risk of severe gastric ulceration.
As an emetic: Inducing emesis is most effective if administered after a small meal.

Ferrets

Indication	Dose	Route	Frequency	Duration	Region
As an emetic	1 teaspoon (5 mL) per 5 lbs. (2.3 kg) of body weight (approximately 2 mL/kg) not to exceed 3 tablespoons (45 mL).	PO	can be repeated once if not initially successful	—	🌎 NA
As an emetic	1-2 mL/kg PO up to 2-3 times	PO	up to 2-3 times	—	🌎 NA
As an emetic	1-5 mL/kg PO; may repeat one time if after 10 minutes emesis does not occur.	PO	may repeat one time if after 10 minutes emesis does not occur	—	🌎 NA

As an emetic: Vomiting usually occurs within minutes.
As an emetic: Inducing emesis is most effective if administered after a small meal.

Swine

Indication	Dose	Route	Frequency	Duration	Region
As an emetic (pot-bellied pigs)	1 teaspoon (5 mL) per 5 lbs. (2.3 kg) of body weight (approximately 2 mL/kg) not to exceed 3 tablespoons (45 mL).	PO	can be repeated once if not initially successful	—	🌎 NA
As an emetic (pot-bellied pigs)	1-2 mL/kg PO up to 2-3 times	PO	up to 2-3 times	—	🌎 NA
As an emetic (pot-bellied pigs)	1-5 mL/kg PO; may repeat one time if after 10 minutes emesis does not occur.	PO	may repeat one time if after 10 minutes emesis does not occur	—	🌎 NA

As an emetic (pot-bellied pigs): Vomiting usually occurs within minutes.
As an emetic (pot-bellied pigs): Inducing emesis is most effective if administered after a small meal.

Doses are a clinical reference for licensed veterinary professionals. Always confirm against the current label and the individual patient.

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Overview

Hydrogen peroxide 3% is a widely available topical antiseptic that is frequently utilized in veterinary medicine as an emergency oral emetic, primarily in dogs.

Clinical Pearl: While it is a household staple, its use as an emetic is generally reserved for situations where immediate veterinary care is inaccessible and rapid decontamination is required. In a clinical setting, centrally acting emetics like apomorphine (for dogs) or xylazine/dexmedetomidine (for cats) are preferred due to higher efficacy and a lower risk of severe mucosal irritation.
Feline Caution: Its use in cats is increasingly discouraged by toxicologists due to a high risk of severe necrotizing hemorrhagic gastritis.
Efficacy: Successful induction of emesis does not ensure that stomach contents have been completely emptied; significant quantities of the ingested drug/toxin may remain or may have already been absorbed.

Mechanism of action

Orally administered hydrogen peroxide (3%) induces a vomiting reflex via direct irritant effects on the oropharynx and gastric lining.

Mechanism: H₂O₂ interacts with the enzyme catalase present in tissue and blood → rapid release of water (H₂O) and oxygen gas (O₂) → massive bubbling and gastric distension.
The combination of direct mucosal irritation and sudden gastric distension stimulates visceral afferent vagal and sympathetic nerves → signals the emetic center in the medulla oblongata → triggers the vomiting reflex.
Emesis typically ensues within 10 minutes of administration.

Safety & warnings

Contraindications

Animals already vomiting
Severely lethargic, comatose, or debilitated animals (e.g., respiratory distress, decreased swallowing reflex, bradycardia)
Seizuring or hyperactive animals
Recent abdominal surgery
Megaesophagus
Ingestion of corrosives/caustics (e.g., acids, alkalis)
Ingestion of sharp objects
Ingestion of bagged illicit drugs
Ingestion of hydrocarbons or petroleum distillates
Rodents or rabbits (incapable of vomiting)

Adverse effects

Aspiration of hydrogen peroxide solution or stomach contents
Vasovagal (bradycardic) response in animals with cardiovascular compromise
Gastric ulceration (particularly in cats)
Gastric-dilatation-volvulus (GDV) in dogs

Precautions

WARNING: Do not induce emesis in animals that lack a normal swallowing reflex or are severely depressed due to high aspiration risk.

Neurological Status: Use caution when attempting to induce emesis in a dog that has ingested a compound that can cause seizures or CNS depression, as CNS status may rapidly deteriorate.
Timeframe: Administration and emesis generally must occur within 4 hours (some say 2 hours or 6 hours maximum) of the toxic ingestion.
Product Safety: If home administration is necessary, ensure clients use ONLY the 3% medical grade solution. Higher concentrations are highly corrosive.
Monitoring: Because aspiration and/or bradycardia are possible, animals should be closely observed. Suctioning, respiratory, and cardiovascular support (e.g., atropine) should be available in a clinical setting.
Re-ingestion: Do not allow the animal to re-ingest vomitus.

Drug interactions

ACETYLCYSTEINE (oral)

Hydrogen peroxide can oxidize acetylcysteine in the gut; alternative emetics are preferred for acetaminophen overdoses.

ANTIEMETICS (e.g., ondansetron, maropitant)

Preadministration or ingestion of these products may negate the emetic effects of hydrogen peroxide.

Monitoring

Efficacy (emesis, signs associated with toxicity of the substance ingested, blood levels of toxicants if applicable)
Heart rate and respiration rate
Thoracic auscultation after emesis (to monitor for aspiration pneumonia)

Overdose

Hydrogen peroxide 3% solution is relatively non-toxic after oral ingestion, though it can cause gastric irritation, vomiting, and rarely gastric ulceration or GDV.

DANGER: Hydrogen peroxide in concentrations of 10% or greater (such as hair bleach or industrial peroxide) can be very corrosive, causing severe burns to the oral and gastric mucosa, and can induce fatal oxygen emboli after oral ingestion.

Available products

Formulations

3% solution (2.5-3.5% w/v)

Veterinary

None as an oral emetic

Human-labeled

Hydrogen Peroxide 3% Solution (OTC, usually sold in pint bottles)

Regulatory status

No regulatory data for: 🇺🇸 US · 🇪🇺 EU · 🇬🇧 UK · 🇭🇰 HK · 🇹🇼 TW · 🇯🇵 JP · 🇰🇷 KR · 🇦🇺 AU

Storage & stability

Store 3% solutions in airtight containers at room temperature and protected from light. Hydrogen peroxide 3% can deteriorate with time; outdated or improperly stored products may not be effective as an emetic.

Client information

EMERGENCY USE ONLY: Never induce vomiting without first consulting your veterinarian or a Pet Poison Control Center. Some toxins (like batteries, bleach, or sharp objects) cause severe damage if vomited back up!

Use the Right Product: Ensure you are using standard 3% hydrogen peroxide. Higher concentrations (like hair dye developer) are extremely dangerous and corrosive.
Administration: Use a dosing syringe or turkey baster to squirt the liquid into the side of the mouth. Do not force it down the throat to avoid your pet inhaling the liquid into their lungs.
Pro Tip: Feeding a small, moist meal (like a slice of bread or a little canned food) right before giving the peroxide can give the stomach something to push against and improve the chances of vomiting. Walking your dog around after giving the dose can also help mix the peroxide in the stomach.
Aftercare: Watch your pet closely. Do not let them re-eat the vomit. Collect a sample of the vomit in a plastic bag or container for your vet to examine.

VetSheet drug reference is intended for licensed veterinary professionals as a clinical decision-support aid, not a substitute for professional judgement or the manufacturer’s current label.