Exelon Patch (Rivastigmine Transdermal System) Drug Information: Uses, Side Effects, Drug Interactions and Warnings at RxListExelon Patch contains rivastigmine, a reversible cholinesterase inhibitor that is known chemically as (S)- 3-[1-(dimethylamino) ethyl]phenyl ethylmethylcarbamate. It has an empirical formula of CThe dementia of Parkinson's disease is purportedly characterized by impairments in executive function, memory retrieval, and attention, in patients with an established diagnosis of Parkinson's disease. The diagnosis of the dementia of Parkinson's disease can be made reliably in patients in whom a progressive dementia syndrome occurs (without the necessity to document the specific deficits described above) at least 2 years after a diagnosis of Parkinson's disease has been made, and in whom other causes of dementia have been ruled out.The following table lists treatment-emergent adverse events that were seen at an incidence of 2% in either Exelon Patch-treated group in the controlled clinical trial and for which the rate of occurrence was greater for patients treated with that dose of the Exelon Patch than for those treated with placebo. The prescriber should be aware that these frequencies cannot be used to predict the frequency of adverse events in the course of usual medical practice when patient characteristics and other factors may differ from those prevailing during clinical studies. Similarly, the cited frequencies cannot be directly compared with frequencies obtained from other clinical investigations involving different treatments, uses, or investigators. An inspection of these frequencies, however, does provide the prescriber with one basis by which to estimate the relative contribution of drug and non-drug factors to the adverse event incidences in the population studied.