- History of hypersensitivity to the treatment drugs; or concomitant drugs (including anticonvulsant agents, anti-parkinsonian agents, antipsychotics, anxiolytics, hypnotic agents, neuroleptic agents, cholinomimetic agents, vitamin E, or ginkgo biloba extract or any other drugs including traditional Chinese herbal medicines which can affect memory); or participants in other clinical studies within the past 30 days.