Lobelia Toxic?

Updated 2026-03-06| 2 min read| 3,566 found this helpful

Lobelia is confirmed toxic to cats, dogs, and horses per official ASPCA toxicity data

Lobeline is the primary toxic compound present in all parts of the plant

Ingestion can cause gastrointestinal distress and dangerous heart rhythm disturbances in affected animals

FAQ

Is Lobelia toxic to Humans?

No formal human toxicity data is documented; accidental ingestion may cause mild to moderate gastrointestinal upset and potential cardiac effects in large quantities (Low)

Is Lobelia toxic to Cats?

Depression, diarrhea, vomiting, excessive salivation, abdominal pain, heart rhythm disturbances (Moderate)

Is Lobelia toxic to Dogs?

Depression, diarrhea, vomiting, excessive salivation, abdominal pain, heart rhythm disturbances (Moderate)

Is Lobelia toxic to Horses?

Depression, diarrhea, vomiting, excessive salivation, abdominal pain, heart rhythm disturbances (Moderate)

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Toxicity Details

Humans

Low

No formal human toxicity data is documented; accidental ingestion may cause mild to moderate gastrointestinal upset and potential cardiac effects in large quantities

Cats

Moderate

Depression, diarrhea, vomiting, excessive salivation, abdominal pain, heart rhythm disturbances

Dogs

Moderate

Depression, diarrhea, vomiting, excessive salivation, abdominal pain, heart rhythm disturbances

Horses

Moderate

Depression, diarrhea, vomiting, excessive salivation, abdominal pain, heart rhythm disturbances

Toxicity Snapshot

Toxic PartsAll plant parts, including leaves, stems, flowers and roots, are considered toxic

Exposure RoutePrimary exposure occurs via ingestion; skin contact may cause mild, transient irritation in sensitive individuals

Toxic CompoundsLobeline

First Aid & Prevention

First 30 Minutes

• Remove any remaining Lobelia plant material from the affected animal's mouth immediately
• Do not induce vomiting unless explicitly directed to do so by a licensed veterinarian
• Rinse the animal's mouth and any exposed skin with clean, cool running water

Contact Vet Immediately

• Your pet or horse has ingested any quantity of Lobelia plant material
• The animal displays symptoms including vomiting, excessive salivation, or abnormal heart rate
• Symptoms persist or worsen after initial first aid administration

Prevention

• Keep Lobelia plants out of reach of indoor pets and fence off outdoor planting areas to block access by horses and livestock
• Avoid planting Lobelia in pastures, grazing areas, or yards accessible to unsupervised pets
• Learn to identify Lobelia to avoid accidental exposure during gardening or outdoor activities

Treatment & Prognosis

• Veterinarians may administer activated charcoal to absorb unprocessed toxins in the digestive tract
• Supportive care including IV fluids and anti-emetic medications will be provided to manage gastrointestinal symptoms
• Cardiac monitoring and corrective medications will be administered if heart rhythm disturbances are detected

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Professional Toxicology

Scientific NameLobelia cardinalis

AliasesCardinal Flower、Indian Pink

Toxicity Grade

HumansLow

CatsModerate

DogsModerate

HorsesModerate

Target Organs

Gastrointestinal tractHeartCentral nervous system

Mechanism of Action

• Lobeline, the active toxic alkaloid, disrupts central nervous system function and cardiac muscle activity, while also irritating the gastrointestinal tract to trigger digestive symptoms

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: Limited formal data available, but ingestion is expected to cause similar gastrointestinal and cardiac symptoms as seen in horses

Small companion mammals (rabbits, guinea pigs, hamsters): Ingestion may lead to severe gastrointestinal distress and potential cardiac complications, so access should be completely prevented

Confusion Risk

The following plants look similar and may be confused:

Scarlet Beebalm Monarda didyma

Visually similar due to shared bright red upright flower spikes; key difference: Scarlet Beebalm has square mint-family stems, while Lobelia has round stems

Red Columbine Aquilegia canadensis

Both produce bright red, hummingbird-attracting flowers; key difference: Red Columbine has bell-shaped spurred flowers, unlike Lobelia's clustered tubular blooms

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Related Toxic Plants

Indian Tobacco

Lobelia inflata

Moderate toxicity

Creeping Bellflower

Campanula rapunculoides

Low toxicity

Lilyleaf Ladybells

Adenophora liliifolia

Low toxicity

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Data Sources

1. ASPCA Animal Poison Control

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