Apple-of-peru is moderately toxic to humans, cats, and dogs. All parts, especially seeds, contain tropane alkaloids (atropine, hyoscine, scopolamine, hyoscyamine). Symptoms include dilated pupils, dry mouth, elevated heart rate, hallucinations (humans), and distress (cats), vomiting, diarrhea (dogs). Immediate medical or veterinary attention is crucial in case of suspected ingestion.