Factors associated with the use of potentially inappropriate medications by older adults with cancer.

OBJECTIVES: To determine the frequency and the factors associated with the use of potentially inappropriate medications (PIMs) by older adults with cancer at an onco-haematology ambulatory clinic of a teaching hospital in Brazil.

MATERIAL AND METHODS: Patients aged 60years or older (n=160) subjected to parenteral antineoplastic chemotherapy from May to December 2015 and treated with one or more medications in the ambulatory clinic were interviewed. Data on medications, comorbidities, oncological diagnosis, and functional status were recorded. Functionality was determined using the Vulnerable Elders Survey (VES-13). PIMs were determined using the 2015 Beers Criteria. Logistic regression was used to determine the factors associated with the use of PIMs.

RESULTS: A total of 78 (48.1%) older adults used at least one PIM. The PIMs to be avoided by older adults were proton pump inhibitors (33.3%), antiemetics (10.5%), long-acting benzodiazepines (10.5%), and antidepressants (7.6%). Multivariate analysis indicated that PIMs were associated with the use of five or more medications (odds ratio, 3.14; 95% confidence interval, 1.4-6.6), after adjusting for the number of medications, number of comorbidities, depression, and arthritis/arthrosis.

CONCLUSION: The frequency of use of PIMs by older adults at the investigated ambulatory clinic was high. Polypharmacy was positively associated with the use of PIMs.