Lily Toxicity

Care Pathway

1. Planning & Triage

Receptionist Telephone Triage

  • Treat as an Immediate Veterinary Emergency: Advise the owner that any contact with lilies, including chewing leaves, licking pollen from fur, or drinking vase water, is potentially fatal and requires immediate assessment
  • Critical Advice: Tell the owner NOT to wait for signs to develop, as irreversible kidney damage occurs before they become obvious
  • Pre-Hospital Decontamination: If there is visible pollen on the coat, advise the owner to gently wipe the fur with a damp cloth and prevent grooming during transit (e.g., using an Elizabethan collar or pet t-shirt)
  • Obtain Toxin Information: Ask the owner to bring a photo of the plant or a piece of the plant in a sealed bag to aid identification

In-Clinic Triage & Initial Plan

Core Triage Principle

Lily toxicity is a time-critical nephrotoxicosis. The primary goal is prompt decontamination and initiation of i/v fluids to maintain euvolaemia and support renal perfusion, aiming to prevent irreversible acute kidney injury (AKI).

Prepare for Arrival

  • Prepare for i/v catheter placement and fluid therapy (catheters, fluids, infusion pump)
  • Gather equipment for gastric decontamination (emesis drugs, activated charcoal, stomach tube)
  • Prepare for dermal decontamination (clippers, shampoo, towels)
  • Ready equipment for baseline blood and urine collection
  • Ensure hospitalisation facilities and urine output monitoring equipment are available

Immediate Triage Actions

  • Time is critical – prompt decontamination and fluid therapy are key to survival
  • Perform a rapid ABC assessment and check coat for pollen
  • Secure intravenous access and start i/v fluid therapy promptly
  • Perform gastric decontamination (induce emesis, administer activated charcoal)
  • Collect baseline bloods (biochemistry) and urine before starting fluids if possible

2. Presentation & Risk Factors

Risk Factors & Toxic Species

  • Risk Factors: Indoor cats, inquisitive behaviour, lack of owner awareness of the danger
  • Highly Toxic Genera: Lilium (true lilies) and Hemerocallis (daylilies)
  • Common Examples: Easter lily, Tiger lily, Stargazer lily, Asiatic lily, Daylily
  • Peace lilies (Spathiphyllum) and Calla lilies (Zantedeschia) are NOT true lilies and do not cause nephrotoxicity, but can cause oral irritation

Clinical Progression

  • 1–6 hours post-ingestion: Initial signs are often gastrointestinal (vomiting, hypersalivation, anorexia, lethargy)
  • 18–72 hours post-ingestion: Signs of Acute Kidney Injury (AKI) may develop, including uraemic vomiting, dehydration, painful or enlarged kidneys and oral ulceration
  • The patient may be polyuric initially, but this progresses to anuria as renal failure worsens
  • Rare signs: Pancreatitis, ataxia, seizures and facial oedema have been reported

3. Diagnostics

Diagnostic Workup

  • Primary Diagnosis: Based on a history of known or suspected exposure, presence of pollen on the fur, or identification of plant material in vomitus
  • Biochemistry (changes from 18-24 hrs):
    • Mild to moderate AKI (IRIS grade I–II) is common and may be present even without azotaemia
    • Severe azotaemia (disproportionately increased creatinine compared with urea has been reported)
    • Hyperkalaemia and hyperphosphataemia may be seen as AKI progresses
    • Mild elevations in hepatic enzymes (ALT/AST) may also be seen later in the syndrome
  • Urinalysis (changes from 12 hrs):
    • Hallmark Finding: Isosthenuria (Urine Specific Gravity 1.008–1.012) indicates loss of concentrating ability
    • Other findings include proteinuria, glucosuria, and the presence of renal tubular epithelial cells or granular casts in the sediment

4. Treatment Protocol

1. Decontamination Protocol

  • Emesis: Induce emesis with an appropriate agent (e.g., dexmedetomidine) if the patient is asymptomatic and ingestion occurred within the last 4 hours (ideally within the first 1-2 hours)
  • Activated Charcoal: Administer a dose orally. Consider repeating every 4–6 hours for 24 hours (without a cathartic) due to potential enterohepatic recirculation of the toxin
  • Dermal Cleaning: Thoroughly wash the entire coat with soap and water to remove all traces of pollen. Consider clipping fur if contamination is heavy.

2. Intravenous Fluid Therapy

  • Initiate i/v fluids promptly to maintain euvolaemia and support renal perfusion
  • Use goal-directed therapy based on regular assessment of urine output and hydration status
  • The duration of fluid therapy should be guided by renal parameters and urine output
  • Monitor closely for fluid overload, especially in cats with pre-existing cardiac disease
  • Contextualised Care: Subcutaneous fluids may be associated with favourable outcomes in select, stable outpatient cases but survival is higher with i/v fluid therapy

3. Supportive AKI Management

  • Antiemetics: Administer maropitant or ondansetron to control persistent vomiting and improve patient comfort
  • Nutritional Support: Provide if anorexia is prolonged beyond 48-72 hours
  • Electrolyte Management: Monitor and correct abnormalities, especially hyperkalaemia
  • Once anuria develops, peritoneal dialysis or haemodialysis are the only effective treatments

Decision Point: Anuria/Oliguria

  • Monitor urine output meticulously
  • If urine production ceases or drops significantly (< 0.5 ml/kg/hr) despite appropriate fluid therapy, the prognosis worsens dramatically
  • Referral for haemodialysis should be discussed and offered early in the course of anuria
CRITICAL SAFETY NOTE: Pharmacological stimulation of urine output (e.g., furosemide, mannitol, fenoldopam) has NOT been shown to improve outcome in lily toxicity-induced AKI and is not recommended

5. Monitoring & Complications

Patient Monitoring

  • Renal Function: Monitor urea, creatinine and electrolytes (especially potassium and phosphorus) every 12-24 hours initially
  • Urinalysis: Recheck for casts, proteinuria and glucosuria daily
  • Hydration & Fluid Balance: Monitor body weight twice daily, PCV/TP and clinical signs of dehydration or fluid overload
  • Urine Output: Quantify urine production continuously to detect the onset of oliguria or anuria early

Potential Complications

  • Development of oliguric or anuric Acute Kidney Injury (AKI)
  • Severe, life-threatening electrolyte derangements (especially hyperkalaemia)
  • Pancreatitis (less common)
  • Chronic Kidney Disease (CKD) can occur as a long-term sequela in cats that survive the initial insult
  • Untreated cats are likely to die or require euthanasia within 3–7 days due to severe AKI

6. Nursing Care

Key Nursing Considerations

Fluid Therapy & Hydration
  • Ensure meticulous management and monitoring of i/v fluids via an infusion pump
  • Frequently assess for signs of fluid overload (e.g., tachypnoea, chemosis, crackles on auscultation, peripheral oedema)
  • Regularly check i/v catheter patency and monitor for phlebitis or swelling
Urine Output Monitoring
  • Maintain a sterile closed urinary catheter system to accurately quantify urine output and minimise infection risk
  • If a catheter is not feasible or required, use non-absorbent litter and weigh trays to estimate urine volume (1g ≈ 1ml)
  • Calculate urine output in ml/kg/hr at each measurement and immediately report any output < 1 ml/kg/hr
Gastrointestinal Support
  • Monitor for ongoing vomiting or signs of nausea (hypersalivation, lip-licking) and administer antiemetics as prescribed
  • Encourage voluntary food intake by offering small, frequent, palatable meals
  • Discuss placement of a feeding tube with the clinician if anorexia is prolonged > 48hrs
Patient Comfort & Environment
  • Provide a comfortable, quiet, stress-free environment to support well-being and appetite
  • Ensure the patient is kept clean, dry and warm

7. Prognosis

>90% Survival with Early Treatment
48-72 hrs Typical Hospital Stay
  • Excellent for asymptomatic cats treated promptly (< 18 hours) with decontamination and appropriate fluid therapy
  • The reported incidence of AKI is 9-47%; however, the prevalence of severe AKI is low
  • Guarded to Poor once anuric or oliguric AKI develops; survival is unlikely without dialysis
  • Some survivors may develop long-term Chronic Kidney Disease (CKD)
  • The prognosis is grave for cats that are already anuric at presentation

8. Drug Dose Tables

Drug Class / Use Drug Dose Notes
Emesis Induction Dexmedetomidine 3–10 µg/kg i/m or i/v
  • Most reliable emetic in cats
  • Median effective dose is often cited as 7 µg/kg
  • Can be reversed with atipamezole
  • Alternatives hydromorphone or xylazine
  • Risk of sedation
Adsorbent Activated Charcoal 0.5–4 g/kg p/o
  • Administer after emesis has stopped (ideally within 6 hrs)
  • Consider repeating every 4–6 hours for 24 hours (without a cathartic)
Antiemetics Maropitant 1 mg/kg i/v or s/c q24h
  • For control of persistent or uraemic vomiting
Ondansetron 0.5–1 mg/kg p/o q12–24h or
0.5 mg/kg i/v loading dose followed by 0.5 mg/kg/h CRI for 6 hours
  • Useful for severe or refractory vomiting/persistent nausea

9. Supporting documents

Links

10. Disclaimer

The responsibility for all decisions lies solely with the user and if there is any information in this website that you are unsure about you should cross-check it with alternative sources, including those listed as references.

See our Disclaimer page here for more information.