2020 年 3 巻 3 号 p. 56-64
Aim: In this study, the dispensing database of health insurance pharmacies was used to investigate the actual status of taking multiple medications in patients with chronic diseases across all age classes, including the number of drugs by age class, frequency of medication with six or more drugs, number of drugs by medical efficacy.
Methods: Medical records of 49,842 patients between August 1 and October 31, 2016 were collected from Taiyo Medical Supply. The prescription period was >28 days. Patients were divided into polypharmacy group (>6 drugs) and non-polypharmacy group (<5 drugs).
Results: Total number of patients were 25,148. The number of drugs by age and the percentage of the polypharmacy group continued to increase till the age of >90 years. In the polypharmacy group, patients were older, visited more medical institutions, and consulted more physicians than those in the non-polypharmacy group did.
Conclusions: Drug prescription increased with age and continued to increase beyond the average life expectancy. Number of physicians were factors that affected taking multiple medications.