Safety verdict
Consulted references classify the plant as toxic or irritating for that pet type.
Pet ingestion lookup
My cat ate Madagascar Periwinkle - what should I do?
Catharanthus roseus
Potentially toxic
Contact your veterinarian or an animal poison-control resource now, especially if any amount was chewed or swallowed.
Verified against ASPCA/provenance audit 2026-05-06 on May 6, 2026.
Signs to watch for
Vomiting, diarrhea, depression, and potential cardiovascular issues.
Escalation note
Ingestion can lead to significant gastrointestinal distress and systemic effects due to the presence of vinca alkaloids. Please contact your veterinarian immediately if ingestion is suspected.
First aid at home
Remove any plant fragments from your cat's mouth and gently wipe the gums with a damp cloth, then call ASPCA APCC or your vet. Do not try to induce vomiting at home.
What to watch for
Mild cases: vomiting, diarrhea, drooling, depression, and loss of coordination. Heavier ingestions can produce tremors, seizures, low blood pressure (weakness, pale gums), and rarely coma. Watch the gums and energy level closely — those are the first hints that more than a nibble was swallowed.
Time window
Signs typically begin within a few hours of ingestion. Mild GI signs from a small ingestion usually resolve within 24 hours; severe cases may need 48 to 72 hours of supportive care.
When to call the vet
Call your vet or ASPCA Animal Poison Control (1-888-426-4435) the moment you confirm ingestion, even if your cat seems fine. Go in immediately for tremors, seizures, severe lethargy, pale or bluish gums, or any signs of weakness.
What this means for your cat
Cats and Madagascar periwinkle don't mix. The plant carries vinca alkaloids — the same chemical family as some chemotherapy drugs — which can cause anything from a mild upset to seizures and dangerously low blood pressure. Most cats find the leaves bitter and stop after a nibble, so serious poisonings are rare but not impossible.
Sources: ASPCA, Pet Poison Helpline.
Poison-control resources
This page summarizes source-bound plant-safety information and is not veterinary advice.