What acute symptoms appear when a dog or cat ingests beta-blockers?

Common signs include a slow heart rate, lethargy, slow or laboured breathing, vomiting, and seizures. Symptoms can appear and worsen within hours — contact your vet for assessment right away.

What tests will the vet perform to assess the level of toxicity?

The vet will conduct a physical exam, ECG, and continuous blood pressure and heart rate monitoring. Blood tests will assess glucose, electrolytes, and organ function; chest X-rays or urinalysis may also be performed if needed.

What can I observe at home to help the vet make a diagnosis?

Note the time symptoms started and how they progressed. Record changes in eating, drinking, and elimination. Film any seizures and bring the suspected medication packaging to the appointment.

How long does recovery take after beta-blocker ingestion?

Recovery time varies depending on the dose and treatment response. Mild cases may improve within a few days, while severe cases can require observation over several days to weeks. Follow your vet's guidance for check-ups.

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

Beta-Blocker Toxicity in Dogs & Cats: Symptoms, ECG Monitoring & Emergency Care [2025]

Beta-blocker poisoning can cause life-threatening bradycardia and hypotension, requiring urgent cardiac monitoring and supportive care.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: AVMA, ASPCA, National Taiwan University Veterinary Teaching Hospital

When to See a Vet

Seek emergency care immediately

•Persistent unconsciousness and unable to be roused
•Obvious breathing difficulty or sudden respiratory arrest
•Very slow heart rate accompanied by confusion or loss of consciousness

Schedule a clinic visit soon (within 24–72 hours)

•Marked lethargy that is difficult to rouse
•Repeated vomiting or a sharp decline in appetite
•Repeated seizures or abnormal muscle contractions

01What Symptoms Indicate Something Is Wrong?

After ingesting beta-blockers, dogs and cats commonly develop acute symptoms affecting the heart, nervous system, and breathing. Stay alert and monitor closely.

Noticeably slow heart rate or irregular heartbeat
Repeated seizures or involuntary muscle twitching
Lethargy, poor responsiveness, or difficulty waking
Slow, shallow, or laboured breathing
Vomiting, significant loss of appetite, or sudden weakness

Seek emergency care immediately if you notice the following symptoms:

⚠️ Coma or loss of consciousness
⚠️ Severe difficulty breathing or respiratory arrest
⚠️ Extreme bradycardia with altered consciousness

02How to Assess Symptoms at Home: What to Watch For and When to Head to Emergency

Key observations to make and record before visiting the vet — this information helps your vet assess and act quickly.

Note the time symptoms started and exactly when the exposure occurred
Observe mental alertness: watch for lethargy or reduced response to stimulation
Record any changes in appetite and water intake
Monitor urination, bowel movements, and vomiting — note frequency and appearance
Take photos or weigh your pet to track changes over time
Record any seizures or episodes on video to share with your vet
If you notice a slow heartbeat or abnormal breathing, seek veterinary care immediately

03How Will the Vet Diagnose This? Common Diagnostic Tests

At the clinic, your vet will assess the severity of poisoning using vital signs, imaging, and lab tests while monitoring for complications.

Full physical examination including cardiovascular, respiratory, and neurological assessment

Electrocardiogram (ECG) to check for rhythm disturbances and conduction abnormalities

Continuous blood pressure and heart rate monitoring to assess circulatory stability

Complete blood count (CBC) and biochemistry panel to evaluate organ function

Blood glucose and electrolyte testing to assess metabolic effects

Urinalysis or toxicology screening where indicated

Chest X-ray to evaluate the heart and lungs and rule out complications

Seek care at a clinic equipped with ECG and continuous monitoring capability

04What Treatment and Care Are Needed? Medications, Diet, and Home Care Guide

Acute treatment focuses on stabilising breathing and circulation. After discharge, ongoing monitoring and follow-up visits are essential.

The primary goal in the acute phase is to stabilise breathing and blood circulation
Intravenous fluids and supportive medications may be required during hospitalisation
ECG, blood pressure, and blood glucose will be monitored continuously in hospital
Specialist interventions or additional monitoring may be initiated as needed
Regular follow-up visits are needed after discharge to monitor heart rhythm, blood pressure, and clinical signs
Restrict activity at home, maintain regular feeding and hydration, and observe for any changes
Contact your vet immediately if symptoms worsen or new abnormalities appear

05What to Prepare Before the Vet Visit: Key Information to Help Your Vet Act Fast

Record the time symptoms began and how they have progressed

List all medications involved and the time of the last known dose

Bring the suspected medication packaging, pill bottle, or photos of the product

Note food and water intake over the past 24 hours

Prepare video recordings of symptoms and a recent weight record for the vet

Bring any recent medical records or test results if available

Call ahead to confirm the clinic is equipped to handle toxicology/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.

Related Symptoms (You May Also Be Looking For)

Bradycardia

Abnormally slow heart rate

Unconsciousness

Fatal outcome

Low blood pressure

Difficulty breathing

Convulsion