What are the common symptoms of cardiac glycoside plant poisoning?

Common signs include frequent vomiting, persistent diarrhoea, lethargy, reduced appetite, changes in heart rate, and muscle tremors or seizures. Seek emergency care immediately if breathing difficulty or collapse occurs — consult your vet for details.

What tests will the vet perform to assess the poisoning?

The vet will perform a physical examination, ECG, blood and biochemistry tests, urinalysis, and X-rays or imaging as needed to evaluate heart and organ function and monitor progress.

What can owners do at home to help with diagnosis?

Record the number of vomiting and diarrhoea episodes, film any seizures or abnormal breathing, bring a sample of the suspected plant, and prepare a list of current medications and known allergies — this speeds up the vet's assessment.

What is the prognosis after poisoning?

Prognosis depends on the amount ingested, the plant species, and how quickly treatment is started. Early detection and prompt care generally improve outcomes. Severe arrhythmias or neurological signs require close monitoring — follow your vet's advice for follow-up.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Cardiac Glycoside Plant Poisoning in Dogs & Cats: Vomiting, Arrhythmia, Diagnosis & Care [2025]

Cardiac glycoside plant toxicity (e.g. oleander, foxglove) can cause life-threatening arrhythmias and requires urgent cardiac monitoring.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: ASPCA, AVMA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•Sudden collapse or brief loss of consciousness with no response
•Rapid breathing or obvious difficulty breathing
•Repeated or continuous seizures that do not stop

Schedule a Clinic Visit Soon (within 24–72 hours)

•Persistent frequent vomiting or refusal to eat
•Ongoing diarrhea with obvious signs of dehydration
•Heart rate that feels noticeably too fast or too slow when felt

01What symptoms signal a problem?

Cardiac glycoside poisoning typically presents with gastrointestinal signs and changes in heart rhythm; severe cases may involve seizures or abnormal breathing.

Frequent vomiting or refusal to eat, often the earliest sign of poisoning
Persistent diarrhoea, signs of dehydration, or changes in bowel habits
Noticeably fast or slow heart rate, more apparent during activity
Generalised or localised seizures, tremors, or involuntary twitching
Lethargy, marked drop in energy, and reduced responsiveness to surroundings

Seek emergency care immediately if you notice the following symptoms:

⚠️ Collapse or brief loss of consciousness with no response
⚠️ Rapid breathing or obvious difficulty breathing
⚠️ Repeated or continuous seizures that do not stop

02How do you assess the situation at home? Key observations and when to seek emergency care

Observing and recording key information at home helps your vet quickly assess the situation and prioritise treatment.

Note the number of vomiting episodes, what was vomited, and when they occurred
Track diarrhoea frequency, stool colour, and whether mucus or blood is present
Record seizures, tremors, or abnormal breathing on your phone
Note changes in alertness, appetite, water intake, and urination or defecation
Observe exercise tolerance and watch for collapse or weakness
Bring all notes, videos, and a sample or photo of the suspected plant to the clinic

03How will the vet make a diagnosis? Common tests and examinations

After arrival, the vet will carry out a systematic assessment focusing on cardiac and toxic effects.

Full physical examination

assessing heart and lung sounds, mucous membrane colour, and hydration status

Electrocardiogram (ECG)

checking for arrhythmias and conduction abnormalities

Haematology

evaluating blood cell counts and electrolyte changes

Biochemistry panel

assessing liver and kidney function and metabolic markers

Urinalysis and chest/abdominal X-rays

looking for ingested material or concurrent findings

Referral to a specialist hospital experienced in ECG monitoring and toxicology is recommended

04How is the condition treated and managed? Medications, diet, and care guidance

Treatment focuses on supportive care and intensive monitoring, with follow-up tests arranged based on clinical progress.

IV fluids and electrolyte support to maintain circulatory stability
Symptomatic control of vomiting and diarrhoea with fluid status monitoring
Continuous ECG monitoring and vital signs observation to detect deterioration
Scheduled blood and biochemistry rechecks and ECG follow-up based on clinical progress
Gradual dietary reintroduction with monitoring of food intake and tolerance
Complex cases should receive specialist follow-up and long-term monitoring

05What should you prepare before the vet visit? Key information to help your vet act quickly

Record videos of vomiting, seizures, or abnormal breathing on your phone

Note the time symptoms first appeared and when the suspected exposure or ingestion occurred

Note whether your pet has collapsed, shown reduced exercise tolerance, or had altered consciousness

Bring a sample or clear photo of the suspected plant for the vet to identify

List all current medications, supplements, and known allergies

Call ahead to find and book a clinic with experience treating poisoning cases

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.