Better drug knowledge with fewer drugs, both in the young and the old Hartholt, K.A. Val, J.J. Looman, C.W.N. Petrovic, M. Schakel, A. Cammen, T.J.M. van der December 2011 Article Acta Clinica Belgica volume 66, issue 5 pp 367-370.

 Little is known about drug knowledge of patients, which is relevant for both the compliance and quality of pharmacotherapy. Drug knowledge was quantified in 160 patients in the outpatient clinics of the departments of Internal and Geriatric Medicine. Medication knowledge was generally poor, especially among older patients. Better knowledge was associated with the use of fewer drugs. Caregivers of dementia patients performed as well as younger patients, indicating that older people can perform well, if well-instructed.
http://repub.eur.nl/res/pub/30959/45_Hartholt%20et%20al_Acta%20Clin%20Belg%202011_66%285%29_367-370AAM.pdf