Alstroemeria (also known as Peruvian lily) is classified as mildly toxic to cats but not deadly. It contains a substance called tulipalin A, which can cause skin or stomach irritation, including mouth sores, vomiting, and upset stomach if ingested in large amounts. However, it is not considered fatal like true lilies such as Easter lilies, tiger lilies, or Asiatic lilies. The ASPCA lists Alstroemeria as non-toxic to cats, but some pet poison helplines and veterinary sources indicate it can cause mild irritation. It is safest to keep Alstroemeria out of reach of cats to avoid any irritation or discomfort.

Summary

• Alstroemeria is mildly toxic to cats, causing irritation but not fatal poisoning.
• Contains tulipalin A, which can cause vomiting and mouth irritation.
• Not as dangerous as true lilies, which can cause severe kidney failure.
• Safe handling includes keeping the plant out of cats' reach.

This balance of views implies caution but no need for panic if small amounts are ingested, and veterinary advice should be sought if ingestion occurs with signs of illness.