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Laburnum (Laburnum Anagyroides, Laburnum X Watereri)

Author: Dr. med. vet. Gisa Löwe | Last modified: 17.02.2026

Laburnum (Laburnum anagyroides, Laburnum x watereri) is one of the most toxic ornamental plants in our gardens. This popular plant with its characteristic yellow flower clusters poses a significant danger to pets. All plant parts are toxic, with the seeds having the highest toxin content. The main active ingredient is the alkaloid cytisine, which is chemically similar to nicotine and acts on similar receptors in the body.

The toxicity of laburnum is classified as very high (+++). Chewing a single branch or ingesting just three seeds can be life-threatening for a dog or cat. The LD50 (lethal dose 50) for subcutaneous injection is 3 mg/kg of body mass for cats and 4 mg/kg of body weight for dogs. These values illustrate the extreme toxicity of this plant for our pets.

Laburnum is found in many gardens and public parks as an ornamental shrub. The plant blooms in spring with striking yellow flower clusters, which later ripen into bean-like pods containing the toxic seeds. There is an increased risk of poisoning for pets, especially during the flowering and seeding season (May to September).

The most important facts at a glance

Poisoning by laburnum represents a serious and potentially life-threatening condition for dogs and cats. All parts of the laburnum plant contain the highly 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. alkaloid cytisine, with the seeds having the highest concentration. Even small amounts can cause serious signs of poisoning.

The symptomatologySymptomatology refers to the entirety of symptoms associated with a particular disease or condition. It describes how a disease manifests itself externally. develops rapidly after ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. and initially includes 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. complaints such as vomiting and salivation, followed by neurological symptoms such as states of agitationAgitation refers to a state of increased Restlessness or nervous activity that can be caused in dogs and cats by pain, fear, neurological disorders, or other medical problems., seizures, and, in severe cases, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system.. 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 based primarily on the medical 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 the clinical picture, supported by laboratory tests.

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. aims at removing the toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. through decontaminationDecontamination refers to the removal of toxic substances or pathogens from a living being, object, or environment to prevent or treat poisoning or infection., stabilizing vital functionsVital functions are essential bodily functions necessary to sustain life. These include breathing, heart rate, blood pressure, body temperature, and level of consciousness., and providing symptomatic treatment. 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. does not exist. With early and adequate treatment, 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 favorable, with the first 24–48 hours being decisive for the outcome.

Preventive measures such as removing laburnum from gardens with pets or securely cordoning off the plants are important to avoid cases of poisoning. Pet owners should be informed about the dangers of laburnum and seek veterinary help immediately if poisoning is suspected.

Causes, development and progression

Laburnum poisoning usually occurs through the oralOral means "through the mouth" and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. of plant parts. Dogs and cats may ingest parts of the laburnum for various reasons:

Cytisine takes effect in the central nervous systemThe CNS (central nervous system) consists of the brain and spinal cord. It is responsible for processing information and controls most functions of the body and behavior. (CNSCNS stands for the central nervous system, which consists of the brain and the spinal cord. It is responsible for processing information and controls many functions of the body.), particularly in the areas of the emetic, vasomotor, and respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. centers. It binds to nicotinic acetylcholine receptorsAcetylcholine receptors are proteins on the surface of nerve and muscle cells that serve as binding sites for the neurotransmitter acetylcholine. They are crucial for the transmission of nerve signals, especially in muscle contraction and in various areas of the nervous system. and initially leads to agitationAgitation refers to a state of increased Restlessness or nervous activity that can be caused in dogs and cats by pain, fear, neurological disorders, or other medical problems., later followed by a paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system. of these systems. The mechanism of action explains the characteristic symptoms: initially, there is a stimulation of the nervous system with states of agitationAgitation refers to a state of increased Restlessness or nervous activity that can be caused in dogs and cats by pain, fear, neurological disorders, or other medical problems., followed later by signs of paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system. leading to respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. arrest.

The toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. is rapidly absorbed after oral ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems., so the first signs of poisoning can appear as early as 15 minutes after ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems.. In the body, cytisine affects blood pressure, which rises both through central stimulation of the vasomotor centerThe vasomotor center is an area in the medulla oblongata that regulates the contraction and relaxation of blood vessel walls, thereby controlling blood pressure. It plays an important role in maintaining circulatory stability in dogs and cats. and through peripheralPeripheral refers to areas located outside the central part of a system or body. In veterinary medicine, this can refer to peripheral nerves, blood vessels, or tissues that are distant from central organs such as the heart or brain. vasoconstrictive effects, while simultaneously emptying blood reservoirs (spleen). At the same time, the heart rate increases.

Young, curious animals and dogs that generally tend to chew on plants are particularly at risk. The danger of poisoning exists year-round, but is particularly high during the flowering period and when seeds ripen.

Mechanism of action

Cytisine takes effect in the CNSCNS stands for the central nervous system, which consists of the brain and the spinal cord. It is responsible for processing information and controls many functions of the body., especially in the areas of the emetic, vasomotor (regulation of blood vessel width), and respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. centers. It has an effect similar to nicotine, as it acts on the same receptors. Initially, an excitatory influence dominates, followed later by a paralyzing one.
Blood pressure is increased centrally via stimulation of the vasomotor centerThe vasomotor center is an area in the medulla oblongata that regulates the contraction and relaxation of blood vessel walls, thereby controlling blood pressure. It plays an important role in maintaining circulatory stability in dogs and cats. and peripherally via a vasoconstrictive effect with simultaneous emptying of blood reservoirs (spleen). The heart rate also increases. The LD50 (lethal dose 50)LD50 (lethal dose 50) is a measure of a substance's toxicity and refers to the dose at which 50% of the exposed population (typically test animals) die. In veterinary medicine, the LD50 (lethal dose 50) is used to assess the potential hazard of toxins or drugs to dogs and cats., i.e., the dose that leads to death in 50% of cases, is 3 mg/kg of body mass for cats and 4 mg/kg of body weight for dogs when the toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. is injected under the skin.
The milk of grazing animals can also be 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..

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1. Main Toxic Substances in Laburnum (Laburnum Spp.)

The toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. of laburnum is based on the alkaloid cytisine, a highly potent neurotoxicNeurotoxic refers to substances that have harmful effects on the nervous system. Neurotoxic poisonings in dogs and cats can be caused by chemicals, medications, or toxins from the environment and lead to severe neurological symptoms. quinolizidine alkaloid. Cytisine is chemically related to nicotine and acts primarily on the central and peripheralPeripheral refers to areas located outside the central part of a system or body. In veterinary medicine, this can refer to peripheral nerves, blood vessels, or tissues that are distant from central organs such as the heart or brain. nervous system.

Particularly 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. are:

Seeds (especially 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.!)
Pods
Flowers
Leaves in lower concentration

2. Mechanism of Action of Cytisine

Cytisine acts as an agonist at nicotinic acetylcholine receptorsAcetylcholine receptors are proteins on the surface of nerve and muscle cells that serve as binding sites for the neurotransmitter acetylcholine. They are crucial for the transmission of nerve signals, especially in muscle contraction and in various areas of the nervous system. (nAChRs) – both in the central nervous systemThe CNS (central nervous system) consists of the brain and spinal cord. It is responsible for processing information and controls most functions of the body and behavior. and in the peripheralPeripheral refers to areas located outside the central part of a system or body. In veterinary medicine, this can refer to peripheral nerves, blood vessels, or tissues that are distant from central organs such as the heart or brain., especially at the neuromuscularNeuromuscular refers to the relationship between nerves and muscles, particularly the transmission of nerve impulses that trigger muscle contraction. Neuromuscular disorders can affect movement and coordination in animals. junction.

A) Phase 1 – Stimulation (Nicotine-Like Effect)

Cytisine mimics acetylcholine and binds to nicotinic receptors.
This initially leads to overstimulation of ganglia and muscle fibers:
- Salivation, excitement, tremors
- Nausea, vomiting
- Muscle cramps, tachycardiaTachycardia refers to an unusually fast heartbeat with a resting heart rate of over 100 beats per minute. It can indicate physical exertion, stress, illness, or heart problems.

B) Phase 2 – Blockade Due to Continuous Stimulation

Continuous stimulation leads to receptor desensitizationDesensitization is a treatment procedure that aims to reduce an animal's sensitivity to an allergen. This is done through gradual exposure to the allergen in controlled doses to build tolerance. → functional collapse.
This causes a neuromuscularNeuromuscular refers to the relationship between nerves and muscles, particularly the transmission of nerve impulses that trigger muscle contraction. Neuromuscular disorders can affect movement and coordination in animals. blockade:
- Muscle relaxation, movement disorders
- BradycardiaBradycardia refers to a slower than normal heart rate, typically below 60 beats per minute in adults. It can occur in healthy individuals, especially athletes, but can also be an indication of heart disease.
- RespiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system.

C) Central Effect

In the brain, cytisine also acts via nicotinic receptors and can lead to restlessness, coordination disorders, seizures, or unconsciousness.

3. Clinical Manifestation in Dogs and Cats

Symptoms usually appear 1–3 hours after ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. and can escalate rapidly depending on the amount.

Early Symptoms (Stimulating Phase):

Salivation, vomiting, abdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. pain
Restlessness, excitement
Muscle tremors, tachycardiaTachycardia refers to an unusually fast heartbeat with a resting heart rate of over 100 beats per minute. It can indicate physical exertion, stress, illness, or heart problems.

Late Symptoms (Inhibitory Phase):

ApathyApathy refers to a state of indifference and reduced interest or lack of emotional involvement in activities or events that would normally arouse interest., paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system., ataxia
DyspneaDyspnea, also known as shortness of breath, is the subjective feeling of breathlessness or difficulty breathing. It can be a symptom of a variety of conditions, including heart disease, lung disease, and anemia. up to respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system.
BradycardiaBradycardia refers to a slower than normal heart rate, typically below 60 beats per minute in adults. It can occur in healthy individuals, especially athletes, but can also be an indication of heart disease., circulatory weakness
Seizures, 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.

In severe cases, death occurs due to respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. arrest or cardiovascular failure.

4. Species-Specific Characteristics

Dogs: Particularly at risk from eating fallen seeds or pods. Young dogs and puppies often show severe CNSCNS stands for the central nervous system, which consists of the brain and the spinal cord. It is responsible for processing information and controls many functions of the body. and respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. symptoms, as they react more sensitively to nicotine-like substances.
Cats: Less frequently affected, as they are pickier eaters. Nevertheless, even a small amount of seeds is enough to triggerA trigger is a stimulus that elicits a specific reaction or state. In veterinary medicine, this can refer to emotional responses, such as fear or aggression, or medical conditions, such as seizures in dogs and cats. central nervous systemThe CNS (central nervous system) consists of the brain and spinal cord. It is responsible for processing information and controls most functions of the body and behavior. disorders, salivation, weakness, and respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. depressionDepression refers to a state of reduced mood and activity. In dogs and cats, it can be triggered by various factors, including illness, trauma, or changes in the environment.. Cats often react very sensitively to neuromuscularNeuromuscular refers to the relationship between nerves and muscles, particularly the transmission of nerve impulses that trigger muscle contraction. Neuromuscular disorders can affect movement and coordination in animals. blockade.

5. Summary of the Toxic Mechanism of Action

Level of Action	Mechanism	Consequences
Nicotinic acetylcholine receptorsAcetylcholine receptors are proteins on the surface of nerve and muscle cells that serve as binding sites for the neurotransmitter acetylcholine. They are crucial for the transmission of nerve signals, especially in muscle contraction and in various areas of the nervous system.	Agonistic continuous stimulation → desensitizationDesensitization is a treatment procedure that aims to reduce an animal's sensitivity to an allergen. This is done through gradual exposure to the allergen in controlled doses to build tolerance.	First excitation, then blockade of nerve signals
CNSCNS stands for the central nervous system, which consists of the brain and the spinal cord. It is responsible for processing information and controls many functions of the body.	Effect via nicotinic receptors in the brain	Restlessness, seizures, central respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. depressionDepression refers to a state of reduced mood and activity. In dogs and cats, it can be triggered by various factors, including illness, trauma, or changes in the environment.
NeuromuscularNeuromuscular refers to the relationship between nerves and muscles, particularly the transmission of nerve impulses that trigger muscle contraction. Neuromuscular disorders can affect movement and coordination in animals. junction	Impaired signal transmission → paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system.	Weakness, ataxia, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. arrest
Autonomic nervous system	GanglionA ganglion is a cystic swelling that usually occurs near joints or tendons, especially in the hands or feet. It is a fluid-filled sac that originates from the joint capsule or tendon sheath and is usually painless. stimulation, then blockade	Salivation, pupil dilationDilation refers to the widening or expansion of a hollow organ or vessel. It can be physiological (normal) or pathological (due to disease)., circulatory problems

Conclusion

Poisoning with common laburnum (Laburnum spp.) is potentially life-threatening for dogs and cats. The alkaloid cytisine it contains acts via nicotinic receptors, first stimulating and then paralyzing—with dramatic consequences for the nervous, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively., and cardiovascular systems. The ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. of seeds or pods is particularly dangerous, as they can be fatal in small amounts. Immediate veterinary care is essential if poisoning is suspected.

Symptoms of intoxication

The toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. is rapidly absorbed, so 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. symptoms can appear as early as 15 minutes after ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems..
It is also stated that this is possible after ingesting as few as three seeds.
The first symptoms are:

Drooling
Vomiting, prolonged, sometimes bloody
Increased heart rate
Dilated pupils
States of excitation

Anxiety
Disorientation
Shivering
Ataxia
Seizures
Coma
Shock (circulatory failure)
Respiratory paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system.

The symptomatologySymptomatology refers to the entirety of symptoms associated with a particular disease or condition. It describes how a disease manifests itself externally. of laburnum poisoning develops rapidly after the plant is ingested. The first signs can appear as early as 15 minutes after ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems.. The progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. can be divided into early and advanced symptoms:

Early symptoms:

Increased salivation (hypersalivation)
PersistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside., sometimes bloody vomiting
Increased heart rate (tachycardiaTachycardia refers to an unusually fast heartbeat with a resting heart rate of over 100 beats per minute. It can indicate physical exertion, stress, illness, or heart problems.)
Dilated pupils (mydriasis)
States of excitement and restlessness

With higher toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. levels in the blood or progressiveProgressive describes a condition or disease that worsens over time. This term is often used to characterize the course of an illness that causes increasingly severe symptoms or damage. poisoning:

Pronounced anxiety
Disorientation and behavioral changes
Muscle tremors and muscle stiffness
Coordination disorders (ataxia)
Seizures up to status epilepticus
Impaired consciousness up to 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.
Circulatory collapse (shock)
RespiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system. with cyanosisCyanosis refers to a bluish discoloration of the skin and mucous membranes, caused by an inadequate oxygen supply to the blood. It can be a sign of heart, lung, or blood diseases. (bluish discoloration of mucous membranes)

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Symptoms can vary in intensity depending on the amount ingested, as well as the size and health of the animal. Neurological symptoms and breathing problems are particularly concerning, as they indicate severe poisoning and can be life-threatening.

In cats, symptoms may start more subtly but often progress more quickly to severe neurological disorders than in dogs. This is due to differences in the metabolism of toxins between species.

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 laburnum poisoning is based primarily on the medical 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 the clinical picture. The decisive factor is proof or reasonable suspicion that the animal had access to laburnum and could have ingested plant parts.

The diagnostic process includes:

A thorough medical history with specific questions about access to laburnum or other toxic plants is essential. Pet owners should be asked if they observed their pet chewing on the plant or if plant parts were visible in the vomit. The chronological sequence of symptoms also provides important diagnostic clues.

The clinical examination often shows tachycardiaTachycardia refers to an unusually fast heartbeat with a resting heart rate of over 100 beats per minute. It can indicate physical exertion, stress, illness, or heart problems., hypersalivation, mydriasis, and neurological abnormalities. The combination of 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. and neurological symptoms is characteristic of laburnum poisoning.

Laboratory tests can be used as support. A blood count with differential diagnosisDifferential diagnosis is the process of weighing two or more conditions that cause similar symptoms to determine the specific cause of a patient's symptoms., electrolytesElectrolytes are minerals in the body that carry an electric charge and perform vital functions such as regulating fluid balance, acid-base balance, and nerve and muscle activity. The main electrolytes include sodium, potassium, chloride, and magnesium., kidney and liver values, and blood gas analysis help to assess the severity of the poisoning and any organ damage. Direct detection of cytisine in the blood or urine is rarely available in practice but can be performed in specialized laboratories.

The differential diagnosisDifferential diagnosis is the process of weighing two or more conditions that cause similar symptoms to determine the specific cause of a patient's symptoms. includes other poisonings with a similar symptom pattern (e.g., nicotine, strychnine, organophosphates), neurological diseases, and metabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. disorders. These must be ruled out, especially if no clear exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. to laburnum can be proven.

In unclear cases, the identification of plant residues in vomit or stomach contents by a botanist or toxicological analysis of stomach contents can be helpful.

Therapeutic principles

There is no 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 measures to be taken depend on the patient’s condition.
In life-threatening situations, securing the vital functionsVital functions are essential bodily functions necessary to sustain life. These include breathing, heart rate, blood pressure, body temperature, and level of consciousness. of respiration and the cardiovascular system is the top priority. In some cases, ventilation is necessary.
DecontaminationDecontamination refers to the removal of toxic substances or pathogens from a living being, object, or environment to prevent or treat poisoning or infection. of the fur and skin is indicated if seed heads or other plant parts are still in the fur.
The stomach and intestines must be emptied, followed by the administration of 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..
The safest method for decontaminationDecontamination refers to the removal of toxic substances or pathogens from a living being, object, or environment to prevent or treat poisoning or infection. is gastric lavage, which may only be performed under the necessary protective measures such as intubation.
Gastric lavage is also useful after previous vomiting and without a time limit.
Further symptomatic therapy consists of substitutions in the water, electrolyte, and acid-base balanceThe acid-base balance refers to the equilibrium between acids and bases in the body, which is important for maintaining the physiological pH in the blood and other bodily fluids. Imbalances can lead to serious health problems., depending on current laboratory findings. In some cases, anti-seizure medications are necessary.
Kidney function should be stimulated.

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Treatment of laburnum poisoning requires quick action and aims primarily at removing the toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi., supporting vital functionsVital functions are essential bodily functions necessary to sustain life. These include breathing, heart rate, blood pressure, body temperature, and level of consciousness., and providing symptomatic 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.. A specific antidote does not exist.

Therapeutic measures include:

Stabilization of vital functionsVital functions are essential bodily functions necessary to sustain life. These include breathing, heart rate, blood pressure, body temperature, and level of consciousness.: In life-threatening situations, securing breathing and circulation is the top priority. In the event of respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system., artificial ventilation may be necessary. 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. supports circulation and promotes the excretion of the toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi..
DecontaminationDecontamination refers to the removal of toxic substances or pathogens from a living being, object, or environment to prevent or treat poisoning or infection.: If plant parts are sticking to the fur, they should be carefully removed. If ingestion occurred recently (within 1–2 hours) and the patient is stable without neurological symptoms, vomiting can be induced. However, this should only be done by a veterinarian, as there is a risk of aspiration if consciousness is already impaired.
Gastric lavageLavage is a rinsing procedure that uses a liquid to clean a body cavity, organ, or wound. In veterinary medicine, lavage can be used, for example, for gastric lavage or to clean an infected wound.: The safest method for decontaminationDecontamination refers to the removal of toxic substances or pathogens from a living being, object, or environment to prevent or treat poisoning or infection. is gastric lavageLavage is a rinsing procedure that uses a liquid to clean a body cavity, organ, or wound. In veterinary medicine, lavage can be used, for example, for gastric lavage or to clean an infected wound. under intubation protectionProtection refers to safeguarding against diseases or harm. In veterinary medicine, this can include protecting animals through vaccinations, the use of parasite control products, or providing a safe environment.. This is also useful after previous vomiting and without a strict time limit, as plant parts can remain in the stomach for a longer period.
Adsorbents: After the stomach is emptied, 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. (1–4 g/kg body weight) is administered to bind toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. that has not yet been absorbed. The dose can be repeated every 4–6 hours.
Symptomatic 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.:
- AnticonvulsantsAnticonvulsants, also called antiepileptic drugs, are medications used to control or prevent seizures. They are used in dogs and cats with epilepsy or other conditions that cause seizures. for seizures (e.g., diazepam, phenobarbital)
- Thermoregulation for hyper-Hyper- is a prefix that means "over," "more than normal," or "excessive." It is used in medical terms to describe conditions or reactions that go beyond the normal level, such as hyperactivity or hypertension. or hypothermia
- Oxygen administration for respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress
- Heart rate and blood pressure management as needed
- Correction of electrolyte and acid-base balanceThe acid-base balance refers to the equilibrium between acids and bases in the body, which is important for maintaining the physiological pH in the blood and other bodily fluids. Imbalances can lead to serious health problems.
Intensive care monitoring: Continuous monitoring of heart rate, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. rate, blood pressure, body temperature, and neurological status is essential. Regular laboratory checks help to assess the success 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. and identify complications early.
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.: Intravenous fluid intake supports kidney function and promotes the excretion of the toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi.. Depending on laboratory findings, electrolytesElectrolytes are minerals in the body that carry an electric charge and perform vital functions such as regulating fluid balance, acid-base balance, and nerve and muscle activity. The main electrolytes include sodium, potassium, chloride, and magnesium. and buffers are supplemented.

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. must be individually adapted to the patient’s condition and often requires hospitalization with intensive care for 24–48 hours.

Prognosis & follow-up care

Laburnum intoxications can be potentially fatal.
Since one of the main effects of laburnum toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. is centrally induced vomiting, any remaining plant parts may be expelled even before therapeutic measures are initiated.
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 good.

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. of laburnum poisoning largely depends on the amount of toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. ingested, the time until treatment begins, and the animal’s individual health status.

With early and adequate treatment, the prognosis is generally favorable. A positive factor is that the toxin cytisine causes centrally triggered vomiting, which may allow plant parts to be expelled even before therapeutic measures begin.

Animals that survive the acuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. phase of poisoning (24–48 hours) have a good chance of a full recovery without long-term consequences. However, in cases of severe poisoning with prolonged seizures or extended hypoxia, neurological residuals may remain.

Aftercare includes:

Regular monitoring of organ functions (especially liver and kidneys) through laboratory tests
Dietary adjustments for persistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. 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
Neurological follow-up examinations for patients with central nervous symptoms
Monitoring of heart function using ECG in patients with cardiovascular complications

Comprehensive information on preventive measures is helpful for pet owners. This includes, in particular, the recommendation to remove laburnum from gardens with pets or to reliably prevent the animals’ access to these plants.

For animals that have survived severe poisoning, a rehabilitation phase with adapted exercise and, if necessary, physiotherapeutic support may be necessary to promote full recovery.

Research outlook

Research into plant poisonings in small animals has become increasingly important in recent years. In the area of laburnum poisoning, current studies focus on several aspects:

New findings on the toxicokinetics of cytisine allow for a better understanding of 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., distribution, and excretion of the toxin in the animal’s body. Current research is investigating species-specific differences in metabolism that could explain why cats react more sensitively to cytisine than dogs. These findings could lead to more targeted therapeutic approaches.

In the field of diagnostics, more sensitive and faster detection methods for cytisine are being developed. Point-of-care tests could enable rapid confirmation of poisoning directly in the veterinary practice in the future, thus speeding up the diagnosis.

Therapeutically, work is being done on improved treatment protocols. Studies on the optimal dosage and duration of use of 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. and the effectiveness of newer adsorbents are currently underway. The development of specific antagonists for nicotinic acetylcholine receptorsAcetylcholine receptors are proteins on the surface of nerve and muscle cells that serve as binding sites for the neurotransmitter acetylcholine. They are crucial for the transmission of nerve signals, especially in muscle contraction and in various areas of the nervous system. could also enable more targeted 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. in the future.

The epidemiology of plant poisonings is increasingly being recorded systematically. International poison information centers for animals collect data on the frequency, seasonal fluctuations, and regional differences in laburnum poisonings. These data help to identify risk groups and use preventive measures more effectively.

Another research focus is on the development of biomarkers that enable early detection of organ damage and thus contribute to the assessment of 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.. Specific markers are being evaluated, particularly for kidney and liver damage.

Interdisciplinary collaboration between veterinarians, toxicologists, and botanists is intensifying to expand knowledge about plant poisonings and integrate it into clinical practice.

Frequently asked questions (FAQs)

How quickly do the first symptoms of laburnum poisoning appear in my pet?
The first symptoms can appear as early as 15 minutes after the ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. of laburnum. Typically, salivation and vomiting appear first, followed by neurological symptoms. Depending on the amount ingested, the progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. can vary in speed.
Can my pet survive laburnum poisoning?
Yes, with early and adequate veterinary treatment, 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 favorable. It is crucial that you take your pet to the veterinarian immediately as soon as you suspect they have ingested laburnum or show corresponding symptoms.
How can I tell if my dog or cat has eaten laburnum?
A certain determination is often difficult. Look for plant remains in your pet’s mouth or vomit. Observe whether your pet has chewed on laburnum plants. Typical symptoms such as sudden vomiting, salivation, and restlessness can provide clues.
Should I try to induce vomiting in my pet if I suspect it has eaten laburnum?
No, do not try to induce vomiting yourself. This can be dangerous, especially if your pet is already showing neurological symptoms. Instead, take your pet to the veterinarian immediately, who can initiate the appropriate measures.
Is there 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. for laburnum poisoning?
A specific antidote for cytisine does not currently exist. Treatment focuses on removing the toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi., supporting vital functionsVital functions are essential bodily functions necessary to sustain life. These include breathing, heart rate, blood pressure, body temperature, and level of consciousness., and treating the symptoms. However, research into specific antagonists is ongoing.
How long does my pet need to stay at the veterinary hospital after laburnum poisoning?
The length of the hospital stay depends on the severity of the poisoning. Inpatient monitoring for 24-48 hours is usually necessary. In severe cases, a longer stay may be required.
Can a recovered laburnum poisoning cause long-term damage to my pet?
With prompt and adequate treatment, most animals recover completely without long-term consequences. However, in cases of severe poisoning with prolonged seizures or extended lack of oxygen, neurological residuals may remain.
What alternatives are there to laburnum in the garden if I have pets?
There are numerous non-toxic alternatives with a similar look. Forsythias also offer yellow flowers in spring. Other safe options include lilac, hibiscus, or rhododendron (not the leaves). Ask for advice on pet-friendly garden plants at a specialist retailer.
Are all parts of the laburnum equally poisonous?
All parts of the laburnum contain 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. alkaloid cytisine, but in different concentrations. The highest concentration is found in the seeds, followed by flowers and bark. But leaves and wood also contain enough toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. to cause severe poisoning if ingested.
Can my pet be poisoned by mere contact with laburnum?
Poisoning through pure skin contact is unlikely. The toxins generally must be ingested orally. However, plant parts can get stuck in the fur and be ingested later during grooming, which is why decontaminationDecontamination refers to the removal of toxic substances or pathogens from a living being, object, or environment to prevent or treat poisoning or infection. of the fur is useful after known contact.

Literature

Bäumer, W. (2008). Intoxications caused by ornamental plants in dogs and cats. Leipziger Blaue Hefte, 202.
http://www.toxcenter.org/stoff-infos/c/cytisin.pdf
GWALTNEY-BRANT, S.M. Plants. In: PETERSON, M.E., TALCOTT, P.A. Small Animal Toxicology. 3rd ed. St. Louis: Elsevier, 2013, p. 499-548. ISBN 978-1-4557-0717-1.
KOVALKOVIČOVÁ, N., ŠUTIAKOVÁ, I., PISTL, J., ŠUTIAK, V. Some food 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. for pets. Interdisciplinary Toxicology, 2019, 12(3): 93-99. DOI: 10.2478/intox-2019-0012.
MEROLA, V., DUNAYER, E. The 10 most common toxicoses in cats. Veterinary Medicine, 2018, 113(8): 34-43.
Löwe G, Löwe O. Poisonings in Dogs and Cats – A Veterinary Guide. 2nd Edition. Kreuztal: Kynos-Verlag. 2021; 208 p.