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Digoxin Toxicity (Digoxin Poisoning) in Dogs

Occurrence: very rare
Location of illness: Chest

Author: Dr. med. vet. Gisa Löwe | Last modified: 06.11.2025

Digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. in dogs is a poisoning caused by an excessive accumulation of the heart medication digoxin in the body. This leads to toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. effects on the cardiovascular system and other organs.

The most important facts at a glance

Digoxin is a heart medication used in dogs to treat heart conditions. It improves heart function but has a narrow therapeutic range, which creates a risk of overdose. Causes of digoxin poisoning in dogs include accidentalAccidental means random or unintentional and refers to events or exposures that are not deliberate, such as the accidental swallowing of foreign objects or toxins by dogs and cats. overdose, impaired kidney function that slows drug excretion, or interactions with other medications. Symptoms of poisoning include loss of appetite, Vomiting, DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems., and lethargy. In severe cases, Seizures and comaA coma is a deep state of unconsciousness where an individual cannot be awakened and does not respond to stimuli. In dogs and cats, it can be caused by severe illnesses, poisoning, or neurological problems. can occur.

For diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients., clinical symptoms, medication historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits., and blood tests are used to check digoxin levels as well as electrolyte and kidney values. An electrocardiogramSee ECG. can reveal Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems.. Treatment of digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. begins with stopping the medication. In mild cases, this is sufficient, while more severe cases require intensive care with intravenous fluid therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. and possibly the administration of a specific antidoteAn antidote is a substance used to neutralize or reverse the harmful effects of poisoning or a drug overdose. Antidotes can be specific to certain poisons or have more general detoxifying effects..

The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. depends on the severity of the poisoning and the timing of treatment. Early detected and treated cases have a good prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop., while severe cases require a more cautious assessment. Preventive measures include carefully following the veterinarian’s dosage instructions, regular blood tests, and checking for possible interactions with other medications. Research focuses on improving diagnostic and treatment procedures as well as developing safer alternatives to digoxin.

Causes

Digoxin is a cardiac glycoside commonly used to treat heart conditions in dogs, especially heart failure and certain cardiac arrhythmias. It works by increasing the heart’s contraction force and lowering the heart rate, leading to more efficient heart function.

However, the therapeutic range of digoxin is very narrow, meaning that the line between an effective and a toxic dose is close. A variety of factors can lead to digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity., including overdose, impaired kidney function that slows down the excretion of the drug, or interactions with other medications.

The causes of digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. in dogs are varied. A common cause is accidentalAccidental means random or unintentional and refers to events or exposures that are not deliberate, such as the accidental swallowing of foreign objects or toxins by dogs and cats. overdose by the pet owner or incorrect dosing by the veterinarian. In addition, certain conditions such as kidney failureRenal failure is a condition in which the kidneys can no longer adequately perform their function of filtering and excreting waste products from the blood. It can be acute or chronic and requires immediate medical treatment. can impair the excretion of digoxin, leading to an increased concentration in the blood.

Also, interactions with other medications that increase the plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. concentration of digoxin or decrease its excretion can lead to toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity.. These include certain diureticsDiuretics are medications that increase urine production in the kidneys to rid the body of excess salt and water. They are often used to treat high blood pressure, heart failure, and certain types of edema., antiarrhythmics, and antibiotics. Therefore, it is important that all medications a dog is taking are carefully monitored.

Symptoms

Very common symptoms:

Common symptoms:

Rare symptoms:

The symptoms of digoxin toxicityToxicity is the measure of a substance’s harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. in dogs can vary greatly and depend on the severity of the poisoning. The most common signs include gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. symptoms such as Vomiting, DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., and loss of appetite. These symptoms often occur early and are often the first signs of poisoning.

Furthermore, neurological symptoms such as lethargy, disorientation, and weakness may occur. In severe cases, Seizures or comaA coma is a deep state of unconsciousness where an individual cannot be awakened and does not respond to stimuli. In dogs and cats, it can be caused by severe illnesses, poisoning, or neurological problems. may also be observed. Heart symptoms are also common and can include Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems., irregular heartbeat, or even Cardiac arrest.

Other possible symptoms include RespiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress, tremors, and a bluish discoloration of the mucous membranes due to lack of oxygen. These symptoms require immediate veterinary attention as they can be life-threatening.

Diagnosis

The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. in dogs is based on a combination of clinical symptoms, historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits., and specific diagnostic tests. The veterinarian will first take a thorough historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. to determine if the dog is taking digoxin and if there is any evidence of overdose.

Blood tests are crucial to measure the concentration of digoxin in the blood. An elevated digoxin level usually confirms the diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients.. In addition, blood tests can be performed to identify electrolyte imbalances or kidney dysfunctionDysfunction refers to an impaired or abnormal function of an organ or system in the body. This can be due to diseases, disorders, or damage and can affect the quality of life. that may affect the effect of digoxin.

An electrocardiogramSee ECG. (ECG) can also be performed to detect Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems. that are typical of digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity.. These tests help the veterinarian determine the extent of the poisoning and plan the appropriate treatment.

Therapy

The treatment of digoxin toxicity aims to alleviate the symptoms and minimize the toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. effects of the drug. Initially, the administration of digoxin is stopped immediately. In mild cases, this may be sufficient to resolve the symptoms.

In more severe cases, inpatient treatment may be required, where the dog is carefully monitored. Intravenous fluid therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. can be used to promote the excretion of digoxin and correct electrolyte imbalances. AntiemeticsAntiemetics are medications used to prevent or treat Nausea and Vomiting. In dogs and cats, they are used in various situations, including after surgery, for motion sickness, or for certain conditions that cause Nausea. can be administered to control Vomiting and Nausea.

In severe Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems., antiarrhythmics may be needed to stabilize heart function. In particularly severe cases, the administration of a specific antidoteAn antidote is a substance used to neutralize or reverse the harmful effects of poisoning or a drug overdose. Antidotes can be specific to certain poisons or have more general detoxifying effects., known as Digoxin Immune Fab, may be considered. This drug binds to digoxin in the blood and prevents its effects.

Prognosis and follow-up care

The prognosis for dogs with digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. depends on the severity of the poisoning and the speed of treatment. In mild cases, where symptoms are recognized and treated early, the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is generally good, and most dogs recover completely.

In more severe cases, the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. may be more guarded, especially if severe Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems. or neurological symptoms are present. Rapid and appropriate treatment is crucial to increase the chances of survival. Long-term monitoring and adjustment of the digoxin dose may be required to prevent future poisonings.

Prevention

PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. in dogs begins with careful monitoring of the medication dose. Pet owners should follow the veterinarian’s instructions exactly and never change the dose without consultation. Regular blood tests to monitor digoxin levels can help detect an overdose early.

It is important to discuss all medications the dog is taking with the veterinarian to avoid potential interactions. Special care should be taken in dogs with kidney problems or other conditions that may affect digoxin excretion.

Good communication between pet owners and veterinarians is crucial to monitor the dog’s health and minimize the risks of digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity.. Regular veterinary check-ups and adjustment of therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. are essential components of preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring..

Outlook on current research

Digoxin toxicity in dogs is an important topic in veterinary medical research, as digoxin is a commonly used drug for the treatment of heart conditions. Current studies focus on improving the diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and treatment of this poisoning. Researchers are investigating new methods for rapid and accurate determination of digoxin concentration in the blood to enable early detection of toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity.. Advances in laboratory technology could help improve the monitoring of dogs taking digoxin in the future and increase the safety of the therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions..

Another area of research focuses on the development of specific antibodies that can be used as an antidoteAn antidote is a substance used to neutralize or reverse the harmful effects of poisoning or a drug overdose. Antidotes can be specific to certain poisons or have more general detoxifying effects. in the event of a digoxin overdose. These antibodies bind to digoxin and neutralize its effect, which is a promising emergency treatment. Clinical trials on the efficacy and safety of such antibodies are ongoing, and initialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. results indicate their effectiveness.

In addition, the role of genetic factors in susceptibility to digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. is being investigated. Some dogs may be genetically predisposed to developing higher blood levels of the drug, making them more susceptible to poisoning. By identifying such genetic markers, veterinarians could better predict which dogs are at higher risk and adjust the dosage accordingly.

Research on digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. is also complemented by the development of new, safer heart medications. Scientists are working to develop drugs that offer the therapeutic benefits of digoxin but are associated with a lower risk of toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity.. Such innovations could reduce the need for digoxin in the long term and minimize the risk of poisoning.

Another exciting direction of research is the investigation of alternative treatment strategies for heart conditions in dogs. This includes the exploration of herbal remedies and dietary supplements that could support the heart without the potential risks of digoxin poisoning. Scientists are investigating the effectiveness and safety of such alternatives, with some showing promising results.

Overall, these research efforts contribute to improving the understanding and management of digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. in dogs. Advances in diagnostics, treatment, and preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. could lead to safer and more effective care for dogs with heart conditions in the long term.

Frequently asked questions (FAQs)

What is Digoxin ToxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. in Dogs? Digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. occurs when a dog receives a toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. dose of the drug digoxin, which is typically used to treat heart conditions. The poisoning can lead to a variety of symptoms, including Vomiting, DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems., and even Death if not treated promptly.
What are the symptoms of digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity.? The symptoms of digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. often include Vomiting, DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., loss of appetite, lethargy, and Cardiac arrhythmia. In severe cases, neurological symptoms such as disorientation, Seizures, and comaA coma is a deep state of unconsciousness where an individual cannot be awakened and does not respond to stimuli. In dogs and cats, it can be caused by severe illnesses, poisoning, or neurological problems. may occur. Immediate veterinary treatment is crucial.
How is digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. diagnosed? The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is usually made through a combination of clinical examination, blood tests to measure digoxin concentration, and electrocardiogramSee ECG. (ECG) to detect Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems.. An accurate historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. of medication use is also important.
What are the causes of digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. in dogs? The most common cause is an overdose of the drug. This can happen due to an error in prescribing, administering, or the dog accidentally ingesting too much medication. Interactions with other medications can also increase the risk.
How is digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. treated? Treatment typically includes administering activated charcoalActivated charcoal is a fine-pored, highly adsorbing material commonly used in veterinary medicine to treat poisoning. It binds toxins in the gastrointestinal tract to prevent their absorption into the body. to reduce the absorptionAbsorption refers to the uptake of substances by living cells or tissues. In the context of veterinary medicine, it often refers to the absorption of nutrients, drugs, or toxins from the digestive tract into the bloodstream. of digoxin in the gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract, intravenous fluid therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., and monitoring the heart rhythm. In severe cases, specific antibodies can be used to neutralize the digoxin.
Can digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. be prevented? Careful dosing and regular monitoring of blood levels of digoxin are crucial to avoid toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity.. It is important to have the dog examined regularly by a veterinarian and to store all medications safely.
Which dogs are most at risk for digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity.? Dogs with pre-existing kidney disease, as this can impair the excretion of digoxin, as well as older dogs and those taking other medications at the same time, are particularly at risk. Genetic factors may also play a role.
How long does it take to recover from digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity.? The recovery time can vary, depending on the severity of the poisoning and the speed of treatment. Some dogs recover within a few days, while others require a longer monitoring period. Regular follow-up examinations are important.
What alternatives are there to digoxin? There are several alternative medications for treating heart conditions in dogs, including pimobendan and enalapril. These options should be discussed with a veterinarian to determine the best treatment for the individual dog.
What should I do if I suspect digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. in my dog? It is important to seek veterinary attention immediately if you suspect your dog has digoxin toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity.. The doctor can perform the necessary tests and initiate appropriate treatment to ensure the best chance of a full recovery.