title: Relation between number of prescribed medication and outcome in peritoneal dialysis patients.
abstract: BACKGROUND
  Many patients with end-stage renal disease need to take a large number of medications. In the present study, we studied the magnitude of problem and explored the relationship between the number of prescribed medications and the clinical outcome of a large cohort of prevalent peritoneal dialysis (PD) patients.
  
  
  METHODS
  We studied the medication list of 266 prevalent PD patients. Dialysis adequacy, residual renal function and nutritional assessment were also performed. The patients were followed for 33.7 +/- 20.7 months.
  
  
  RESULTS
  On average, each patient required 4.7 +/- 1.8 type of medications or 10.0 +/- 4.9 tablets per day. 40 patients (15.0%) needed at least 7 types of medication; 33 patients (12.4%) had to take more than 15 tablets each day. There is a significant but weak correlation between the number of types of medication and the Charlson's comorbidity score (r = 0.252, p < 0.001). Despite the large number of medication prescribed, the blood pressure control, serum cholesterol level, and the use of aspirin after atherosclerotic disease remained suboptimal in many patients. By multivariate analysis, independent factors for patient survival were Charlson's comorbidity score, number of types of medication, duration of dialysis, overall SGA score, and mean arterial blood pressure. Each additional type of medication conferred 20% increase in risk of death (95% CI, 1.6-41.7%, p = 0.032), and the effect is independent on the Charlson's comorbidity score. The actual number of pills taken by a patient did not influence survival in this model.
  
  
  CONCLUSIONS
  Our results indicate that the number of prescribed medications is related to the clinical outcome of PD patients. The number of prescribed medication may reflect the severity of uremic complications and comorbid diseases not reflected by the Charlson's comorbidity score. Nevertheless, dialysis physicians should carefully balance the clinical need of treating multiple medical conditions with the potential problems of a complicated therapeutic regimen.
authors.affiliation: Department of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, China. ccszeto@cuhk.edu.hk
authors.forename: C C
authors.initials: CC
authors.lastname: Szeto
authors.forename: K M
authors.initials: KM
authors.lastname: Chow
authors.forename: B C H
authors.initials: BC
authors.lastname: Kwan
authors.forename: C B
authors.initials: CB
authors.lastname: Leung
authors.forename: K Y
authors.initials: KY
authors.lastname: Chung
authors.forename: M C
authors.initials: MC
authors.lastname: Law
authors.forename: P K T
authors.initials: PK
authors.lastname: Li
mesh_terms: D000368:Aged; D015331:Cohort Studies; D011307:Drug Prescriptions / Q000706:statistics & numerical data*; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D007676:Kidney Failure, Chronic / Q000188:drug therapy / Q000453:epidemiology / Q000628:therapy; D008297:Male; D008875:Middle Aged; D009752:Nutritional Status / Q000187:drug effects; D010530:Peritoneal Dialysis / Q000401:mortality / Q000706:statistics & numerical data*; D016896:Treatment Outcome