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Monstera / Split-Leaf Philodendron
Monstera deliciosa or Monstera adansonii
Monstera (Monstera deliciosa and M. adansonii), commonly called Swiss Cheese Plant or Split-Leaf Philodendron, is a popular tropical houseplant toxic to cats. As a member of the Araceae family, it contains insoluble calcium oxalate crystals (raphides) packed throughout its leaves and stems. Chewing the plant releases these needle-like crystals into the oral mucosa, causing immediate intense pain.
Important Notes
Toxic compounds: insoluble calcium oxalate raphides; proteolytic enzymes in the sap intensify the reaction
Mechanism: crystals are forcefully ejected into the mouth and throat lining when plant tissue is damaged, causing mechanical burns and swelling
Symptoms: sudden oral pain, intense drooling, pawing at mouth, difficulty swallowing (dysphagia), swollen lips and tongue, vomiting
Severe throat swelling may impair breathing — seek veterinary attention immediately in this case
Rinse the mouth with water; contact your vet if swallowing is impaired or symptoms do not quickly subside
Potentially Toxic Parts
Leaf
Possible Symptoms Reported in Cats
Swelling of the mouth and tongue, leading to difficulty swallowing
Gastrointestinal · Immediate
Intense burning and irritation of the mouth, accompanied by crying out in pain
Gastrointestinal · Immediate (upon chewing or biting)
Excessive drooling or hypersalivation
Gastrointestinal · Immediate (upon chewing or biting)
Vomiting
Gastrointestinal · Shortly after ingestion (typically follows the initial oral irritation if swallowed).
Disclaimer: This summary was compiled from multiple sources and is for informational use only. It is not a diagnosis or treatment plan. Toxicity can vary based on the substance, amount, plant part, and individual cat. If you think your cat may have been exposed to a toxic substance, contact a veterinarian right away.