The present invention includes a method for improving cognitive function in a human suffering from a neurodegenerative cognitive disorder. The method comprises administering to a patient a total daily dose of a cholinesterase inhibitor and a quaternary ammonium antimuscarinic compound. The total daily dose is divided into one or more doses administered before food intake. The quaternary ammonium antimuscarinic compound is administered in a first drug delivery element configured for rapid absorption into a body of the patient, and the cholinesterase inhibitor is administered in a second drug delivery element configured for a slower or delayed absorption into the body of the patient.