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Hello and thanks for trusting me to help you and Mo today. I am a licensed veterinarian with over 25 years experience and would be happy work with you.
Peace lily ingestion is not the type of lily that causes problems due to toxin absorption so activated charcoal would have no effect. The "toxic" principle of this plant is the release of insoluble crystals that cause irritation and swelling of the oral cavity. This can lead to vomiting and swelling of the lips, mouth and even airways. Depending on how many crystals were released will determine the severity of the signs. Giving charcoal will be of no benefit and may even be contraindicated if he is having any trouble swallowing.
Here are links to more information about this plant and the types of symptoms that may occur if ingested. Also so you can verify that this is the type of lily that was ingested.
If Mo is showing any signs of discomfort, I would definitely make sure to have him treated at a veterinary ER today.
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.
My posted replies are for general education only and not meant as a diagnosis. Only after a thorough veterinary examination can a diagnosis for your pet be made and specific treatments be advised or medications be prescribed.