# Activated Charcoal: veterinary dose and monograph

> Activated Charcoal is a veterinary gastrointestinal drug. Decontamination tool — adsorbs many ingested toxins / drugs in the GI tract, preventing absorption. Indications include ingested toxin / drug overdose within 1–2 h (and many for >2 h with extended elimination); multi-dose for enterohepatic recirculation (ibuprofen, marijuana, theobromine, NSAIDs); iron supplements, ethanol, ethylene glycol — NOT adsorbed (limited / no value). This monograph lists 9 reference doses for dogs, cats, cattle, horses, goats and sheep and 2 more species, each with route, frequency and source, plus meat and milk withdrawal periods for food animals.

Source: https://vetmasterji.com/drugs/activated-charcoal · Last reviewed: 2026-10-01

## At a glance

- **Drug class:** Gastrointestinal
- **Also known as:** ToxiBan, Liqui-Char, Charcoal
- **Species with doses:** Dogs, Cats, Cattle, Horses, Goats, Sheep, Rabbits and Small mammals
- **General dose range:** 1000–4000 mg/kg PO single (or q4–6h × 2–3 doses) — check the species tables for the indication
- **Routes:** PO
- **Last reviewed:** 1 October 2026

## Indications

- Ingested toxin / drug overdose within 1–2 h (and many for >2 h with extended elimination)
- Multi-dose for enterohepatic recirculation (ibuprofen, marijuana, theobromine, NSAIDs)
- Iron supplements, ethanol, ethylene glycol — NOT adsorbed (limited / no value)
- Cyanide, fluoride, strong acids / alkalis — NOT adsorbed

## Activated Charcoal dose by species

Doses are per administration unless stated. mg/kg doses scale with body weight; per-animal, per-quarter and infusion-rate doses are shown as the reference writes them.

### Dogs

*Activated Charcoal doses for dogs*

| Indication | Dose | Route | Frequency | Duration |
| --- | --- | --- | --- | --- |
| Single-dose decontamination | 1000–4000 mg/kg | PO | once | — |
| Multi-dose (enterohepatic toxins) | 1000–2000 mg/kg | PO | q4–6h × 2–3 doses | — |

- Single-dose decontamination: Plumb’s: 1–4 g/kg PO (Rudloff 2006; Beasley & Dorman), up to 5 g/kg (Bailey), as a slurry of 1 g in 5–10 mL water; give an osmotic cathartic with or within 30 min of the first dose. Protect the airway (cuffed ET tube) if the patient is sedated or neurologically abnormal. Contact a poison-control service for toxin-specific advice.
- Multi-dose (enterohepatic toxins): Plumb’s (Rudloff 2006): repeat every 4–6 h for toxins that undergo enterohepatic or enteroenteric recirculation. Give cathartic with the first dose only; monitor sodium (hypernatraemia risk with repeated doses). Dose 1–2 g/kg PO per repeat.

### Cats

*Activated Charcoal doses for cats*

| Indication | Dose | Route | Frequency | Duration |
| --- | --- | --- | --- | --- |
| Single-dose decontamination | 1000–4000 mg/kg | PO | once | — |

- Single-dose decontamination: Plumb’s (dogs and cats): 1–4 g/kg PO as a slurry; a nasogastric tube is useful in cats (Jutkowitz & Schildt 2009). Protect the airway if sedated.

### Cattle

*Activated Charcoal doses for cattle*

| Indication | Dose | Route | Frequency | Duration | Withdrawal |
| --- | --- | --- | --- | --- | --- |
| Pesticide / mycotoxin ingestion | 1000–5000 mg/kg | PO | once | — | no slaughter withdrawal |

- Pesticide / mycotoxin ingestion: Plumb’s (Puschner 2010): ruminants 1–5 g/kg as a slurry (≈1 g in 5 mL water) by stomach tube; multi-dose helps in several plant intoxications (e.g. oleander). Mix in a cathartic — sodium or magnesium sulfate 250–500 mg/kg or 70% sorbitol 3 mL/kg — unless diarrhoea is present. Activated charcoal is not absorbed — no withdrawal is required for the charcoal itself (the toxin may still require one).

### Horses

*Activated Charcoal doses for horses*

| Indication | Dose | Route | Frequency | Duration |
| --- | --- | --- | --- | --- |
| Toxin / NSAID overdose decontamination | 1000–5000 mg/kg | PO | once via NG tube | — |

- Toxin / NSAID overdose decontamination: Plumb’s: foals at least 250 g, adults up to 750 g TOTAL as a slurry in up to 4 L warm water by stomach tube; leave 20–30 min, then give a laxative (Oehme 1987). The 1–5 g/kg range is the ruminant/large-animal plant-toxin dose (Puschner 2010).

### Goats

*Activated Charcoal doses for goats*

| Indication | Dose | Route | Frequency | Duration | Withdrawal |
| --- | --- | --- | --- | --- | --- |
| Pesticide ingestion | 1000–5000 mg/kg | PO | once | — | no slaughter withdrawal |

- Pesticide ingestion: Plumb’s (Puschner 2010): ruminants 1–5 g/kg as a slurry by stomach tube, with a cathartic unless diarrhoea is present.

### Sheep

*Activated Charcoal doses for sheep*

| Indication | Dose | Route | Frequency | Duration | Withdrawal |
| --- | --- | --- | --- | --- | --- |
| Pesticide ingestion | 1000–5000 mg/kg | PO | once | — | no slaughter withdrawal |

- Pesticide ingestion: Plumb’s (Puschner 2010): ruminants 1–5 g/kg as a slurry by stomach tube, with a cathartic unless diarrhoea is present.

### Buffalo

No buffalo-specific doses are on file, so buffalo are dosed as cattle.

*Activated Charcoal doses for buffalo*

| Indication | Dose | Route | Frequency | Duration | Withdrawal |
| --- | --- | --- | --- | --- | --- |
| Pesticide / mycotoxin ingestion | 1000–5000 mg/kg | PO | once | — | no slaughter withdrawal |

- Pesticide / mycotoxin ingestion: Plumb’s (Puschner 2010): ruminants 1–5 g/kg as a slurry (≈1 g in 5 mL water) by stomach tube; multi-dose helps in several plant intoxications (e.g. oleander). Mix in a cathartic — sodium or magnesium sulfate 250–500 mg/kg or 70% sorbitol 3 mL/kg — unless diarrhoea is present. Activated charcoal is not absorbed — no withdrawal is required for the charcoal itself (the toxin may still require one).

### Rabbits

*Activated Charcoal doses for rabbits*

| Indication | Dose | Route | Frequency | Duration |
| --- | --- | --- | --- | --- |
| Rabbit / cavy toxin ingestion | 1000–3000 mg/kg | PO | once | — |

- Rabbit / cavy toxin ingestion: Plumb’s (vitamin K1 monograph, Richardson & Gwaltney-Brant 2002): rabbits, rodents and small mammals — activated charcoal 1–3 g/kg effectively adsorbs anticoagulants. Do not induce emesis in rabbits or rodents.

### Small mammals

*Activated Charcoal doses for small mammals*

| Indication | Dose | Route | Frequency | Duration |
| --- | --- | --- | --- | --- |
| Ferret / rodent toxin ingestion | 1000–3000 mg/kg | PO | once | — |

- Ferret / rodent toxin ingestion: Plumb’s (vitamin K1 monograph, Richardson & Gwaltney-Brant 2002): rabbits, rodents and small mammals 1–3 g/kg. Do not induce emesis in rodents; 3% hydrogen peroxide is an effective emetic in ferrets.

## Contraindications

Unprotected airway (sedated, comatose, seizing patient) — aspiration risk; intubate first or wait. Caustic ingestion (acids, alkalis, hydrocarbons) — charcoal does not bind these and may obscure endoscopy. GI perforation / obstruction. Severe vomiting. Sorbitol-containing products: avoid in dehydrated patients and small animals (hypernatraemic dehydration).

## Species-specific warnings

> **Caution:** Cats: Cats often resist oral charcoal — light sedation and gastric tube may be needed. AVOID sorbitol-containing products in dehydrated cats.

> **Caution:** Dogs: Multi-dose for enterohepatic toxins (ibuprofen / marijuana / theobromine).

## Adverse effects

- Black stool (cosmetic)
- Constipation / impaction
- Aspiration pneumonia (most serious — only give to alert / intubated patients)
- Hypernatraemia (with sorbitol-containing products in dehydrated patients)

## Drug interactions

- Reduces absorption of orally administered medications — separate oral drugs by 2–3 h
- N-acetylcysteine (NAC) for acetaminophen: give NAC IV when charcoal is used

## Pregnancy and lactation

Safe — does not absorb systemically.

## Monitoring

- Airway protection during administration
- Hydration status (especially with sorbitol products)
- Clinical signs of intended toxin
- Faecal output (impaction risk with multi-dose)

## Toxicity and overdose

Acute aspiration: most serious complication. Pre-emptively intubate sedated / depressed patients before charcoal administration. Sorbitol-containing products: dehydrated patients can develop hypernatraemia and severe hypovolaemia — avoid in cats and dehydrated small animals.

Management: Aspiration pneumonia: standard pneumonia management — oxygen, broad-spectrum antibiotics, supportive care. Sorbitol-induced hypernatraemia: cautious IV fluid replacement.

## Clinical pearls

- Within 1 h of toxin ingestion: 1–4 g/kg PO single dose is the highest-yield decontamination
- Marijuana ingestion in a dog: multi-dose charcoal every 6 h × 3 doses interrupts enterohepatic THC recycling
- Ibuprofen ingestion: multi-dose charcoal + aggressive IV fluids + GI protection
- NO value for ethylene glycol, ethanol, iron, fluoride, strong acids / alkalis — wasted dose and aspiration risk
- Cat that won't swallow: sedate lightly with dexmedetomidine + intubate + administer via gastric tube
- Always pair first charcoal dose with a cathartic (sorbitol) to speed transit and clear the adsorbed toxin

## Mechanism of action

Highly porous activated carbon — surface area 950–2000 m² per gram — adsorbs ionised and non-ionised compounds within the GI lumen via van der Waals forces, preventing systemic absorption. Multi-dose interrupts enterohepatic recirculation by adsorbing drug excreted in bile back into the gut lumen ("gut dialysis").

## Formulations and products

- Activated charcoal powder 1 g per kg (mix to slurry in water)
- ToxiBan suspension (with sorbitol) — pre-mixed activated charcoal
- ToxiBan (Lloyd) — Activated charcoal suspension with sorbitol, Pre-mixed oral suspension

## Storage

Dry storage in sealed container — activated charcoal absorbs moisture and contaminants from the air.

## Before you use this dose

> **Caution:** Reference doses for veterinary professionals. Confirm the dose against the product label, the patient’s condition, current guidance and local regulations before use; the attending veterinarian remains responsible for every clinical decision.

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## Frequently asked questions

### What is the dose of Activated Charcoal for dogs?

Reference doses for Activated Charcoal in dogs: 1000–4000 mg/kg PO once (Single-dose decontamination); 1000–2000 mg/kg PO q4–6h × 2–3 doses (Multi-dose (enterohepatic toxins)). Confirm against the label and the patient before use.

### What is the dose of Activated Charcoal for cats?

Reference doses for Activated Charcoal in cats: 1000–4000 mg/kg PO once (Single-dose decontamination). Confirm against the label and the patient before use.

### What is the dose of Activated Charcoal for cattle?

Reference doses for Activated Charcoal in cattle: 1000–5000 mg/kg PO once (Pesticide / mycotoxin ingestion). Confirm against the label and the patient before use.

### What is the withdrawal period for Activated Charcoal?

Cattle, PO (Pesticide / mycotoxin ingestion): no slaughter withdrawal; Goats, PO (Pesticide ingestion): no slaughter withdrawal; Sheep, PO (Pesticide ingestion): no slaughter withdrawal. Follow the product label and national regulations where they differ.

### When should Activated Charcoal not be used?

Unprotected airway (sedated, comatose, seizing patient) — aspiration risk; intubate first or wait. Caustic ingestion (acids, alkalis, hydrocarbons) — charcoal does not bind these and may obscure endoscopy. GI perforation / obstruction. Severe vomiting. Sorbitol-containing products: avoid in dehydrated patients and small animals (hypernatraemic dehydration).

### What are the side effects of Activated Charcoal in animals?

Black stool (cosmetic); Constipation / impaction; Aspiration pneumonia (most serious — only give to alert / intubated patients); Hypernatraemia (with sorbitol-containing products in dehydrated patients).

## Sources

- Plumb's Veterinary Drug Handbook

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VetMasterJi is a clinical decision-support and education platform for veterinary professionals and students. It does not provide veterinary advice, diagnosis or treatment for specific animals. All drug doses, calculators and differentials are references that must be independently verified before clinical use; the attending registered veterinarian remains solely responsible for every clinical decision.