The Exelon Patch (Transdermal Rivastigmine) for the treatment of severe delirium in elderly subacute care inpatients

Acetylcholine levels are decreased in delirium, a condition of a sudden change in mental capacity occurring due to a illness, medication or similar insult. Rivastigmine is a medication for Alzhiemer's Disease, another condition where there is a change in mental capacity and low levels of acetylcholine. It increases levels of acetylcholine in the brain. THis trial aims to determine if a rivastigmine patch given to elderly patients in hospital after their illness has resolved but who still have delirium will have a less severe delirium.