Bitter aloe Toxic?

Updated 2026-03-06| 2 min read| 1,676 found this helpful

All parts of Bitter aloe are toxic, with concentrated leaf sap posing the highest exposure risk

Key toxic compounds include aloin A/B, aloesin, and related anthracene and chromone derivatives

Ingestion typically causes bloody diarrhea, excessive urination, and blood in urine in exposed humans and animals

FAQ

Is Bitter aloe toxic to Humans?

Bloody diarrhea, excessive urination (polyuria), blood in urine (hematuria) (Moderate)

Is Bitter aloe toxic to Cats?

Expected to cause bloody diarrhea, excessive urination, and blood in urine if ingested (limited species-specific data available) (Moderate)

Is Bitter aloe toxic to Dogs?

Expected to cause bloody diarrhea, excessive urination, and blood in urine if ingested (limited species-specific data available) (Moderate)

Is Bitter aloe toxic to Horses?

Expected to cause bloody diarrhea, excessive urination, and blood in urine if ingested (limited species-specific data available) (Moderate)

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Toxicity Details

Humans

Moderate

Bloody diarrhea, excessive urination (polyuria), blood in urine (hematuria)

Cats

Moderate

Expected to cause bloody diarrhea, excessive urination, and blood in urine if ingested (limited species-specific data available)

Dogs

Moderate

Expected to cause bloody diarrhea, excessive urination, and blood in urine if ingested (limited species-specific data available)

Horses

Moderate

Expected to cause bloody diarrhea, excessive urination, and blood in urine if ingested (limited species-specific data available)

Toxicity Snapshot

Toxic PartsWhole plant, especially leaf sap

Exposure RouteIngestion is the primary high-risk exposure route; direct skin contact with concentrated leaf sap may cause local irritation

Toxic CompoundsAnthracene derivatives; Aloin A; Aloin B; Hydroxyaloines; Chromone glucosides; Aloeresin A; Aloeresin B (aloesin)

First Aid & Prevention

First 30 Minutes

• Rinse mouth thoroughly with clean water to remove any remaining plant residue after confirmed ingestion
• Wash affected skin with mild soap and cool water immediately if exposed to concentrated leaf sap
• Collect a sample of the ingested plant for accurate identification to guide care

Contact Vet Immediately

• If ingestion of any amount of the plant is confirmed in children, pets, or grazing livestock
• If symptoms including bloody diarrhea, blood in urine, or excessive urination develop after exposure
• If local skin irritation from sap contact persists for more than 24 hours

Prevention

• Keep Bitter aloe plants out of reach of children, pets, and grazing livestock
• Clearly label toxic aloe varieties to avoid confusion with edible aloe species
• Wear protective gloves when handling the plant to avoid contact with irritant leaf sap

Treatment & Prognosis

• Administer decontamination measures such as activated charcoal for recent, confirmed ingestion as directed by a medical/vet professional
• Provide symptomatic supportive care including fluid replacement to address dehydration and electrolyte imbalances from diarrhea
• Monitor urinary and kidney function to detect and address potential tract damage from hematuria

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Professional Toxicology

Scientific NameAloe ferox Mill.

AliasesCape Aloe、Aloe succotrina、Aloe africana

Toxicity Grade

HumansModerate

CatsModerate

DogsModerate

HorsesModerate

Target Organs

Gastrointestinal tractUrinary bladderKidneys

Mechanism of Action

• Anthracene derivative compounds act as potent gastrointestinal mucosa irritants, increasing intestinal motility and causing bloody diarrhea

• Toxic compounds also irritate urinary tract lining, leading to increased urination and blood in urine

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: Ingestion may cause identical symptoms including bloody diarrhea, polyuria, and hematuria, with risk of severe dehydration in cases of large intake

Sheep: Low risk under typical grazing conditions, but ingestion of large quantities may cause mild to moderate gastrointestinal and urinary distress

Confusion Risk

The following plants look similar and may be confused:

Other Aloe species Aloe spp.

Visually similar growth form; most other Aloe species are also toxic, so all unidentified aloe varieties should be treated as potentially toxic

Yucca species Yucca spp.

Similar long, pointed succulent leaf morphology; Yucca species are non-toxic, unlike Aloe ferox

Agave species Agave spp.

Similar rosette succulent growth form; Agave sap only causes local irritation on contact, rather than systemic toxicity if ingested

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Related Toxic Plants

Aloe vera

Aloe barbadensis Mill.

Moderately toxic

Spiral aloe

Aloe polyphylla Pillans

Moderately toxic

Torch plant aloe

Aloe aristata Haw.

Moderately toxic

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Data Sources

1. CliniTox (Universität Zürich)

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.