tokens: RESULTS : The mean +/- SD duration of BZD / RD use was 7 +/- 7 years ( range 1 - 31 ). Two or three BZDs / RDs were concomitantly taken by 26 % of users ( n = 20 ). Long - term use of these drugs was associated with female sex and use of a higher number of drugs with effects on the CNS , which tended to be related to diagnosed dementia .