The affected pet appears confused, lost, and anxious with an awkward head tilt and gait which often includes stumbling, weakness and falling down. They may lose interest in eating or stop eating completely, become excessively thirsty and experience sudden incontinence – both urinary and fecal. They may have sudden and extremely severe diarrhea. Substantial weight loss and muscle wasting. They may show loss of personality, loss of cognitive function, loss of sense of smell, sudden blindness, sudden deafness, skin lesions and severe itching. They may become extremely vocal or stop barking or meowing completely. They may exhibit a strange cough. As their fear and anxiety levels increase, they are prone to restlessness with panting and pacing and whining or crying, they may experience sleep disturbances and become clingy. As the side effects increase in severity the Librela affected dog and Solensia affected cat may appear extremely lethargic, with sudden hind end weakness or paralysis, tremors, and seizures.
Lab tests may show UTIs; increased blood urea nitrogen levels; sudden diagnosis of cancer.
The most commonly asked question is: 'Has anyone else seen this symptom or behavior following Librela injections?' The information below may provide you with insight about the most commonly reported side effects. Sharing this knowledge with a veterinary professional is a critical step in your pet's care. This website uses the EudraVigilance Veterinary Database of Suspected Adverse Drug Reaction Reports as the source of suspected adverse drug reactions (sADRs) for Librela. It is colloquially known as EVVet. The vast majority of these reports were filed by veterinarians and includes reports from countries in which Librela is on the market. To scan the data to see if your pet is experiencing side effects that have been reported, see the descriptions below.
There were 22,053 Animals affected in the 21,034 individual cases reported as of September 24, 2024. Keep in mind that only 1-10% of adverse events (side effects) are generally reported to regulatory agencies, thus it is reasonable to anticipate that the number of associated cases is likely to be far higher. With the exception of the Canadian Package Insert, Zoetis has neglected to inform vets and the public of significant suspected side effects, thus the percentage of reporting may well be <1%, as many vets continue to fail to connect the dots from the drug to the symptoms (Side effects with fewer than 10 reports are not included on this page at this time).
Data on Solensia side effects:
EVVet also collects adverse event reports on Solensia for cats and according to the data cats are experiencing the same side effects as dogs. View a list of Solensia side effects reported to the Food & Drug Administration of the U.S. here: FDA FOI Solensia Side Effects
The best way to access the data directly is through the interactive notebooks being published in d8abased by a group of volunteer scientists, making the data searchable and visible as well as analyzing Librela incident rates and half-life estimates using mathematical and statistical analysis in the absence of key data from the manufacturer: https://librela.d8abased.com
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NOS = Not Otherwise Specified
Lack of Efficacy (3,613); Polydipsia - excessive thirst (3,088); Anorexia - loss of appetite (2,712); Lethargy (2,614); Death (2,568); Recumbency (902); Hyperthermia (555); Malaise (532); Weight Loss (566); General Pain (361); Reluctant to move (277); Pale Mucous Membrane (241); Oedema (248) Adipsia - decreased or absent thirst (266); Collapse NOS (282); Discomfort NOS (183); Dehydration (185); Increased Appetite (166); Mass NOS (139)
Localized Pain NOS; Abnormal Posture (NOS); Lying Down; Appetite Disorder NOS ; Weight Gain Abdominal Mass; Jaundice; Cyanosis; Systemic Disorder - NOS; Trauma - NOS; Congested Mucus Membrane; Hypothermia; Increased Skin Temperature; Glazed eye; Exercise Intolerance; Haematoma; Loss of Condition; Lipoma - fatty tumors; Ulceration; Abscess - NOS
Progressive inappetence / Unexplained, rapid & significant weight loss or atrophy with no increase in activity or decrease in eating / Eating less food / Refusing food / Lack of interest in food / Anorexia / Needs hand fed / Syringing liquid food / Feeding tube / Wouldn't eat in morning.
Progressive Lethargy / Listless / Fatigue / Weak / Excessive sleeping / Can't lift head / Apathetic / Corpse-like / Seems to have aged since first injection / Low / Flat / Disengaged / Constantly in deep sleep.
A change in an animal’s ability to sense its environment: the primary signs of nervous system disorders include behavioral changes, seizures, tremors, pain, numbness, lack of coordination, and weakness or paralysis of one or more legs. The effects of an injury on sensory and motor functions depend on its location and severity (Merck Online). NOS = Not Otherwise Specified
Ataxia - swaying, staggering gait (3,189); Seizure (1,219); Tremor (859); Paresis (696); Proprioception Abnormality - unconscious body awareness (759); Disorientation (547); Central Nervous System Disorder NOS (363); Nystagmus - flickering eyes (354); Impaired Consciousness (266); Paralysis (310); Neurological Disorder NOS (288); Loss of Consciousness (181); Cognitive Disorder NOS (162); Neuromuscular Disorder (138); Cranial Nerve Disorder (110)
Head Tremor; Hyperesthesia > sensitivity to sensory stimulant; Hyporeflexia; Hypertonia >muscle tension; Mental Impairment NOS; Peripheral Neuropathy; Mydriasis; Abnormal Movement; Akinesia - inability to move muscles; Anisocoria; Cerebral Vascular Accident; Mental Confusion; Focal Seizure; Head Pressing; Sedation; Sensory Abnormality; Coma; Horner's Syndrome; Somnolence
Restless, unsettled, confused. barking whining or crying, scared, anxious, reactive, stressed, jumpy, miserable, aggressive, dementia symptoms, tail no longer wags, blank stare, spaced out, memory loss, distant, lost, chattering, tremors, wobbling, twitching, spasms, tics, ripping out fur, facial paralysis, stroke, head tilt (many more)
Progressive Ataxia / "Can't feel any pain 'cos he can't feel anything at all" / Worsening mobility from pre- Librela state / Paralysis / Can't stand or stay mobile without assistance / Unable for more than a few steps / Falling / Stumbling / Knuckling / Dragging back end / Crossing legs when walking / Proprioceptive deficits / Wobby gait / Unsteady / Splayed legs / Acting drunk / Moving slower / Dragging one leg / Leg Weakness / Never walked again / Weight shifting between legs / Kyphosis worse
*https://www.adrreports.eu/ suspected side effects medical events that have been observed following the use of a medicine, but which are not necessarily related to or caused by the medicine.
The digestive system includes all of the organs that are involved in taking in and processing food. It begins with the mouth and includes the esophagus, stomach, liver, pancreas, intestines, rectum, and anus (Merck Online). NOS = Not Otherwise Specified.
Emesis - Vomiting (2,084); Diarrhea (1,824); Involuntary Defecation (404); Hypersalivation (312); Hemorrhagic Diarrhea (230); Abdominal Pain (208); Pancreatitis (189); Nausea (162);
Fluid in Abdomen; Flatulence, Bloating and Distention; Distension of Abdomen; Gingival Disord Dysphaia; Colitis; Digestive Tract Hypermotility; Abdominal Cavity Hemorrhage; Abnormal Stool Coloration; Gastritis; Anal Sac Disorder; Gastric Enteritis; Difficulty Eating NOS; Digestive Tract Disorder NOS; Dyspepsia; Chattering of Teeth; Gastric Ulcer; Anal and Rectal Disorder NOS; Enteritis; Gastric Dilation
Haematochezia; Retching; Intestinal Stasis; Melaena; Lip Disorder; Tenesmus; Stomatitis; Tongue Disorder; Intestinal Disorder NOS; Megaoesophagus; Tooth Disorder; Oral Hemorrhage; Hemorrhagic Gastroenteritis; Halitosis; Peritonitis; Haematemesis; Regurgitation; Stomatitis; Tenesmus
Diarrhea / Soft Stool / Inflamed gastrointestinal tract / Intestinal issues / Flatulence, Passing gas / Bad smell / New Colitis diagnosis / Intestinal bleeding / Repeated cycles of Gastroenteritis / New Gastroenteritis diagnosis / Constipation / Hard abdomen / Pain in tummy / abdomen / Extended, Swollen belly / Hard pebble-like poo / Does not want abdomen touched / Choking / Gagging / New or worsening of existing diagnosis / Laryngeal paralysis / Esophageal paralysis or collapse / Megaesophagus
The urinary system or tract includes the kidneys, the ureters (tubes that connect the kidneys to the bladder), the bladder, and the urethra - the tube through which urine exits the body (Merck Online). NOS = Not Otherwise Specified
Polyuria - frequent urination (2,472); Urinary Incontinence (1,753); Urinary Tract Infection (639); Renal Insufficiency - loss of kidney function (200)
Anuria - Suppression of Urine; Cystitis - inflammation of the Urinary Bladder; Dysuria - Difficult, Painful Urination; Nephritis - Kidney Inflammation; Neuropathy; Renal Disorder NOS; Stranguria - Slow, Painful Urination; Regurgitation; Urinary Bladder Disorder NOS; Urinary Retention; Urinary Tracts Disorder NOS
Sudden onset kidney failure despite regular blood tests / Increased kidney levels (off the charts) / Acute kidney issue / Kidney enlarged / Protein in urine / Chemical smell from breath / Dilute urine / Phosphorous / Low specific gravity.
*https://www.adrreports.eu/ suspected side effects medical events that have been observed following the use of a medicine, but which are not necessarily related to or caused by the medicine.
The musculoskeletal system includes the bones, cartilage, muscles, ligaments, joints, tendons, and other connective tissue. It supports the body, permits movement, and protects the vital organs. Because many other body systems (including the nervous system, blood vessels, and skin) are interrelated, disorders of one of these systems may also affect the musculoskeletal system (Merck Online). NOS = Not Otherwise Specified
Muscle Weakness (1,312); Musculoskeletal Disorder NOS (978); Lameness (509); Arthritis (300); Bone and Joint Disorder (266); Joint Pain NOS (106);
Myopathy - Profound Hindlimb Weakness; Muscle Stiffness; Ligament Rupture; Intervertebral Disc Disease; Spondylopothy - Vertebral Degeneration; Fracture; Jaw Disorder; Hyperextension; Torticollis -head Tilt
He lost so much muscle from his rear end and he's wobbly / Muscle wastage / Extreme muscle wastage / Muscle spasm in his shoulder and was wining and crying 10 minutes / Loss of control over his hind legs and significant muscle loss / No muscle left in right hind leg / Nystagmus and the head bending a bit sideways / The head tilt has remained / Lost the use of his legs and had a head tilt / Symptoms of vestibular disease, head tilt, nystagmus, wobbly, falling to one side
New behaviors previously minor or not evident prior to Librela (note that the descriptions overlap with other Reaction Groups)
Hyperactivity (826); Behavioral Disorder (819); Inappropriate Urination (565); Vocalization (478); Anxiety (421); Inappropriate Defecation (122); Aggression (117); Sleep Disturbance (113);
Grooming Disorder; Misc. Eating Disorder; Pica; Sexual Disorder;
More vocal e.g. whining, moaning, barking and crying out at night / Not sleeping / Waking through the night / Aggressive / Angry / On edge / Snappy / Growling / Grumpier / Cried day & night Paranoid / Howling and barking at nothing / More reactive / Anxious / Scared / Panicky / Fearful / Hiding / Clingy / Needy / Scared to be alone / More fragile / Terror attacks
*https://www.adrreports.eu/ suspected side effects medical events that have been observed following the use of a medicine, but which are not necessarily related to or caused by the medicine.
The skin is the largest organ and provides a protective barrier against the environment, regulates temperature, and sense of touch.The skin has 3 major layers: the epidermis or outermost layer, the dermis or middle layer, and subcutis or innermost layer. Other important parts of the skin include skin appendages (such as hair and claws) and subcutaneous muscles and fat (Merck Online). NOS = Not Otherwise Specified
Pruritus (680); Dermatitis and Eczema (468); Alopecia (363); Bacterial Skin Infections (319); Erythema (200); Skin Disorders NOS (190); Skin Lesion NOS (117); Dermal Mass (109);
Desquamation (74); Skin Hemorrhage (65); Skin Texture Change; Hair Change; Pigmentation Disorder; Skin Oedema; Skin Ulceration; Skin and Tissue Infection NOS; Dermal Cysts; Dermal Thickening; Granuloma; Skin Necrosis; Claw, Nail Disorder; Seborrhea; Hyperkeratosis; Malodour;
Skin infections / Progressively worse itching / Alopecia / Fur falling out / Inconsistent or no fur regrowth / Paws ulcerated / Lesions / Constant licking, Scratching and gnawing until they bleed / Wounds not healing / Dermatitis / Discoloration of skin / Hot spots / Cysts between toes / Injection site abscess / Skin rash / Eczema / Several small holes near her collar seeping / Looks like the pores of her skin are tearing / Crusty scabs / Dull thinning and rough coat / Red, inflamed, itchy
The respiratory system consists of the large and small airways and the lungs. When a dog breathes air in through its nose or mouth, the air travels down the trachea, which divides into the tubes known as the right and left bronchi, then into the smaller airways called bronchioles in the lungs. The most important function of the respiratory system is to deliver oxygen into the blood (Merck Online). NOS = Not Otherwise Specified.
Tachypnoea - rapid breathing (1,050); Dyspnoea - shortness of breath (490); Cough (279);
Epistaxis; Respiratory Tracts Disorder NOS; Pneumonia; Rale; Sneezing; Pulmonary Edema; Bronchitis; Hydrothorax; Nasal Cavity Disorder NOS; Rhinitis; Apnoea; Pulmonary Disorder NOS; Hypoxia
Teary watering eyes / Puffy lower eye lids / Excessive sneezing / Nasal congestion / Runny nose / Nasal discharge, runny or thick / Excessive panting / Laboured breathing / Aspiration Pneumonia / Pneumonia / Shallow breathing / Gasping for air / Asthma-like / Heavy breathing / Unresponsive & barely breathing / New diagnosis of COPD / Rapid breathing / Wheezing.
The lymphatic system absorbs excess fluid and returns it to the bloodstream, absorbs fat from the digestive tract, transports white blood cells and certain proteins, and produces antibodies or immunoglobulins. NOS = Not Otherwise Specified
Lymphadenopathy - lymph node enlargement (169)
Other Coagulation Abnormality; Spleenomegaly - enlargement of the spleen; Hemorrhage NOS; Spleen Nodules; thrombosis; Spleen Rupture
Diagnosed with hemangiosarcoma, hemangioma / Ruptured spleen / Tumour, mass on or near spleen / Enlarged or twisted spleen / Internal bleed / Hemorrhage / Vomit blood / Brown vomit / Mottled spleen / Splenic infarcts.
*https://www.adrreports.eu/ suspected side effects medical events that have been observed following the use of a medicine, but which are not necessarily related to or caused by the medicine.
Symptoms related to the site of Librela Injection. NOS = Not Otherwise Specified
Injection Site Pain (173); Injection Site Edema (111); Injection Site Mass NOS (101)
Injection Site Inflammation (50); Injection Site Reaction NOS; Injection Site Hair Change; Injection Site Lesion; Injection Site Erythema; Injection Site Infection; Injection Site Pruritus; Injection Site Hemorrhage; Injection Site Skin Change; Injection Site Necrosis
Injection site abscess
The cardiovascular system comprises the heart, veins, arteries, and capillary beds. The atrioventricular (mitral and tricuspid) and semilunar (aortic and pulmonic) valves keep blood flowing in one direction through the heart, and valves in large veins keep blood flowing back toward the heart (Merck Online). NOS = Not Otherwise Specified
Tachycardia (191)
Murmur (79); Hypertension (79); Circulatory Shock (53); Syncope; Arrhythmia; Hypotension; Cardiac Enlargement; Weak Pulse; Cardiac Insufficiency; Bradycardia; Cardiac Arrest; Pericardial Effusion; Vasculitis; Valvular Disorder; Cardiac Disorder NOS; Peripheral Vascular Disorder
New mass on heart / Arrhythmia (abnormal rhythm) / Atrial fibrillation / Cardiac arrest / Heart attack / New diagnosis or rapid progression of existing heart murmur or congestive heart failure / Fluid around heart / Heartbeat not audible / Bradycardia (slower than normal heart rate) / Increased or Decreased blood pressure / Dangerously high tachycardia (very fast heart rate) / Enlarged heart.
*https://www.adrreports.eu/ suspected side effects medical events that have been observed following the use of a medicine, but which are not necessarily related to or caused by the medicine.
The inner ear is housed in a bony labyrinth in the petrous portion of the temporal bone. The bony labyrinth contains the membranous labyrinth with its sensory organs responsible for hearing and balance. NOS = Not Otherwise Specified
Internal Ear Disorder (346); Deafness (131);
Impaired Hearing; Ear Infection NOS; Otitis Externa; Other ear Disorder NOS; Ear Pruritus; Otitis; Ear Canal Disorder; Otorrhoea; Pinnal Irritation; External Ear Disorder NOS; Ear Pain;
Sudden and rapidly deteriorating hearing loss / Deafness
The endocrine system includes the hypothalamus, pituitary gland, thyroid gland, parathyroid glands, adrenal glands, part of the gastrointestinal tract, pancreas, kidneys, liver, ovaries and testes. NOS = Not Otherwise Specified.
Diabetes Mellitus (107)
Adrenal Gland Disorder NOS; Hypothyroidism; Hyperadrenocorticism; Hypoadrenocorticism;
New diabetes diagnosis / Increased or decreased Glucose/
New Cushing's diagnosis / Suspected Cushing's / Adrenal gland issue
*https://www.adrreports.eu/ suspected side effects medical events that have been observed following the use of a medicine, but which are not necessarily related to or caused by the medicine.
The eye is an active organ that constantly adjusts the amount of light it lets in and focuses on objects near and far. It produces continuous images that are quickly relayed to the brain. Disorder can affect the orbit, optic nerve, lens, retina, etc. NOS = Not Otherwise Specified.
Impaired Vision (106);
Blindness; Ocular Discharge; Eye Redness; Eye Disorder NOS; Conjunctivitis; Corneal Ulcer; Periorbital Edmea; Blepharospasm; Keratoconjunctivitis; Protrusion Membrana Nictitans; Palpebral Disorder; Glaucoma; Abnormal Vision; Cataract
Rapid (24hrs) dramatic deterioration in vision / Cloudy / Smoky lens / Glassy / Glazed / Ulcer / Abscess not healing / Temporary blindness / Horner’s Syndrome / Conjunctivitis / Eye inflamed / Lost vision in one eye with no known cause found / Changes in pupillary light reflex / intermittent swelling of one eye.
The liver is the largest discrete organ in the body. The liver is uniquely supplied by arterial and venous blood. Oxygen-rich arterial blood provides ~20%–30% of hepatic perfusion, with the majority (70%–80%) supplied by the portal vein (Merck Online). NOS = Not Otherwise Specified.
N/A
Hepatopathy (73); Hepatomegaly NOS (62); Gall bladder - bile duct disorder NOS; Gall Bladder Muscocele; Hepatitis; Hepatic Failure; Liver Nodules
Increased enzyme levels / Enlarged Liver / Liver Failure / Changed shape and/or size of Liver / Liver Infection
*https://www.adrreports.eu/ suspected side effects medical events that have been observed following the use of a medicine, but which are not necessarily related to or caused by the medicine.
47 Different Reactions were reported in this reaction group, the majority with fewer than 10 cases. NOS = Not Otherwise Specified.
N/A
Splenetic Neoplasm NOS (73); Neoplasia NOS (69); Lymphoma (63); Hepato-Biliary Neoplasm; Metastatic Neoplasia; Mast Cell Tumor; Osteosarcoma; Pulmonary Neoplasm; Haemangiosarcoma; Skin Sarcoma NOS; Adrenal Gland Tumor; Mammary Gland Neoplasm
Increased size and/or number of tumours and/or lumps, new Cancer diagnosis, Aggressive or Rapid Worsening of existing Cancer.
The immune system consists of a network of white blood cells, antibodies, and other substances that fight off infections and reject foreign proteins (Merck Online) NOS = Not Otherwise Specified.
Allergic Edema (130); Anaphylaxis (122); Immune Mediated haemolitic Aenemia (120); Hypersensitivity Reaction (105)
Immune Mediated thrombocytopenia (92); Urticaria (56); Immune Mediated Polyarthropathy; Autoimmune Disorder NOS
Suspected immune mediated / Anaphylactic reaction / Hypothyroidism (low thyroid), Hyperthyroidism (high thyroid) / Lupus / Received Plasmapheresis / Auto immune meningitis / Immune-mediated polyarthritis (IMP)
*https://www.adrreports.eu/ suspected side effects medical events that have been observed following the use of a medicine, but which are not necessarily related to or caused by the medicine.
The primary sex organs are the testes and genital tract in males and the ovaries, fallopian tubes, and uterus in females (Merck Online). NOS = Not Otherwise Specified.
N/A
Genital Tract Pruritis; Vulvovaginitis; Prostrate Hypertrophy; Penile Disorder;
N/A
*https://www.adrreports.eu/ suspected side effects medical events that have been observed following the use of a medicine, but which are not necessarily related to or caused by the medicine.
Librela side effects. Solensia Side effects. Beransa side effects.
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Tens of thousands of reported cases.
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