Is Lidocaine poisonous if ingested

Answer 1

Yes, anything can be poisonous if ingested to an extent

It's important to clarify that there are ingestable forms of Lidocaine, which a doctor will prescribe for symptoms like stomach or abdominal pains. This of course is not in place of treatment but just to help with pain. It isn't recommended to do this without the recommendation of a doctor as there are specific rules to follow when taking this form of Lidocaine (e.g. not eating or drinking until feeling comes back), but this is an option for patients with internal pain.