[Prescription drugs and the elderly: results of the Argento study].

Objective: To evaluate prescription drug use in the elderly and in particular, to determine the number and types of medications taken, whether and to what extent drugs that are contraindicated in this age group are being used, and what type of prescription check may be performed by primary care physicians.
Design: A survey was performed in a sample of non-institutionalised elderly subjects (= 65 years). These were selected by cluster sampling in 11 of 20 Italian regions and were interviewed in the home by trained interviewers using a standardised questionnaire.
Results: Eighty-seven percent of interviewed subjects reported that they had taken at least one medication in the previous year; higher frequencies were found in age groups= 75 years. The most common therapeutic classes of drugs used in all participating regions, in the previous week, were cardiovascular, gastrointestinal, metabolic (including drugs to treat diabetes) and nervous system. Among interviewed subjects, 45.3% reported using 4 or more different drugs, though wide regional differences were observed (Campania 60.5%, Bolzano 35.6%); 7.2 % were taking potentially inappropriate drugs while 2.3% were taking medications that may lead to potentially harmful interactions. In addition, 84.9% of subjects reported that their primary care physician regularly checked their drug prescriptions.
Conclusions: The high frequency of prescription drug use observed in the elderly is a diffuse phenomenon, related to the worsening health conditions that inevitably accompany aging. Considering the extent of this phenomenon, care should be taken to improve qualitative (i.e. contraindications in the elderly, potential drug-interactions) and quantitative (high number of medications taken by the elderly) appropriateness in physician prescribing. In addition, special attention must be placed on regularly checking drug therapies in the elderly.