This is an article on somnolence and confusion as well as psychiatric symptoms in a small number of geriatric patients.
It is possible that in the old-old these symptoms may be more pronounced, and also vastly under-reported.
Drug side-effects and drug interactions should be considered in geriatric patients manifesting changes in mental status who have recently been started on drugs of this class. It may necessary to review their other medications as drugs in this class have a number of interactions based on the Cytochrome P-450 system.