Evaluation of prescription along three health-care periods in the elderly.

Polypharmacy, potentially inappropriate prescriptions and inadequate coordination between prescribers are among main factors explaining the occurrence of adverse drug events in elderly patients. Prospective and descriptive study of medication prescriptions for elderly patients during a continuous period of health-care: entry in an acute geriatric unit (T1), at discharge (T2) and two months after hospitalization (T3). A global iatrogenic risk was defined: presence of poly-pharmacy and/or PPI (Laroche criteria) and/or absence of quality indicators for prescription according to the French health authority.