Apple seeds - The seeds are mildly poisonous, containing amygdalin.
Chocolate - Contains theobromine at levels toxic to cats and dogs.
Deathberries - Deathberries are an extremely poisonous species of red berries, and are known to Twolegs as yew berries.
Holly Berries - Holly berries, while not as dangerous as deathberries, are still a danger to kits.
Foxglove seeds - Foxglove seeds are known to be a dangerous medicine. While they can help the heart, they can easily cause paralysis and heart failure. Can be mistaken for poppy seeds.
Nightshade - Twenty berries consumed can kill you, cause memory loss, or incabability of learning. Used to kill a cat who cannot be saved quickly, it is poisonous.
White snakeroot - All parts are poisonous, causing nausea and vomiting.
Yew - Can be used to contract poison as a medicine, or causing to vomit if consumed
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Warrior Cats: Medicene Cat Guide
FanfictionEverthing you shold know about a med cat