Benzodiazepine Use and Risk of Acute Angle-Closure Glaucoma: A Population-Based Case-Crossover Study.

INTRODUCTION: Theoretically, benzodiazepines (BZDs) can narrow the iridocorneal angle and induce acute angle-closure glaucoma (AACG). However, little evidence exists regarding this association. OBJECTIVE: The objective of this study was to assess whether the use of BZDs is associated with the risk of AACG. METHODS: We conducted a population-based case-crossover study using the nationwide claims database of the National Health Insurance Service in Korea. Patients with newly diagnosed AACG-between 1 January 2013 and 31 December 2016-who had received at least one BZD prescription prior to AACG diagnosis were enrolled. The date of AACG diagnosis was set as the index date. We assessed BZD use by each patient during a 30-day case period prior to the index date and three consecutive control periods that preceded this date. We used conditional logistic regression that adjusted for concomitant medications to determine the odds ratio for the use of BZDs in the case period compared with that in the control period in patients with incident AACG. RESULTS: Of the 11,093 patients with incident AACG, 6709 received a prescription for BZD prior to diagnosis. BZD use was associated with an increased risk of AACG [adjusted odds ratio (aOR) = 1.40; 95% confidence interval (CI) 1.27-1.54]. AACG risk was similar for short-acting (aOR = 1.40, 95% CI 1.24-1.57) and long-acting BZDs (aOR = 1.33, 95% CI 1.18-1.50). CONCLUSION: We found that BZD use was associated with AACG risk in the Korean population. Clinicians should carefully monitor the occurrence of visual disturbance in BZD-treated patients.

Twelve-year trend in the use of zolpidem and physicians' non-compliance with recommended duration: a Korean national health insurance database study.

OBJECTIVES: Abuse of zolpidem has sporadically been reported and little is known regarding nationwide patterns of zolpidem use in Korea. This study investigates the extent of zolpidem usage exceeding the recommended duration and the predictors. METHODS: We conducted a drug utilization study using the national sample cohort database of the Korea National Health Insurance Corporation between 2002 and 2013. The study subjects were patients treated with zolpidem in the outpatient setting. An episode was defined as a period of continuous zolpidem therapy. The provider-based episode allowed for a gap of up to 3 days between two consecutive prescriptions from the same institution. The person-based episode allowed for a gap of up to 3 days, regardless of institution. We calculated the proportion of zolpidem use for periods over 30 days and conducted logistic regression analyses to investigate the relevant predictors. An adjusted odds ratio (aOR) with a 95% confidence interval (CI) was estimated for each predictor. RESULTS: The usage of zolpidem is dramatically increased by approximately 18 times since zolpidem was authorized in the market (1181 in 2002 vs. 21,399 in 2013). The treatment duration in 8.3% of episodes exceeded 30 days out of 75,087 zolpidem users. The odds of zolpidem prescription exceeding 30 days were highest in patients aged 65 years and older (aOR = 2.13, 95% CI 1.78-2.53) and at tertiary hospitals (aOR = 2.14, 95% CI 1.68-2.72). Women were more likely than men to be treated with zolpidem for over 30 days. CONCLUSION: We found dramatic increase of zolpidem use from 2002 to 2013. In 8.3% of the prescribed episodes of zolpidem, the recommended duration was exceeded. Efforts are required to reduce prescriptions that are inconsistent with the recommended guidelines for older patients, women, and in tertiary hospitals.

Projection of future pharmacy service fees using the dispensing claims in hospital and clinic outpatient pharmacies: national health insurance database between 2006 and 2012.

BACKGROUND: Predicting pharmacy service fees is crucial to sustain the health insurance budget and maintain pharmacy management. However, there is no evidence on how to predict pharmacy service fees at the population level. This study compares the status of pharmacy services and constructs regression model to project annual pharmacy service fees in Korea. METHODS: We conducted a time-series analysis by using sample data from the national health insurance database from 2006 and 2012. To reflect the latest trend, we categorized pharmacies into general hospital, special hospital, and clinic outpatient pharmacies based on the major source of service fees, using a 1% sample of the 2012 data. We estimated the daily number of prescriptions, pharmacy service fees, and drugs costs according to these three types of pharmacy services. To forecast pharmacy service fees, a regression model was constructed to estimate annual fees in the following year (2013). The dependent variable was pharmacy service fees and the independent variables were the number of prescriptions and service fees per pharmacy, ratio of patients (≥ 65 years), conversion factor, change of policy, and types of pharmacy services. RESULTS: Among the 21,283 pharmacies identified, 5.0% (1064), 4.6% (974), and 77.5% (16,340) were general hospital, special hospital, and clinic outpatient pharmacies, respectively, in 2012. General hospital pharmacies showed a higher daily number of prescriptions (111.9), higher pharmacy service fees ($25,546,342), and higher annual drugs costs ($215,728,000) per pharmacy than any other pharmacy (p <  0.05). The regression model to project found the ratio of patients aged 65 years and older and the conversion factor to be associated with an increase in pharmacy service fees. It also estimated the future rate of increase in pharmacy service fees to be between 3.1% and 7.8%. CONCLUSIONS: General hospital outpatient pharmacies spent more on annual pharmacy service fees than any other type of pharmacy. The forecast of annual pharmacy service fees in Korea was similar to that of Australia, but not that of the United Kingdom.

Use of injectable drugs with oral-formulation alternatives for outpatients in South Korea.

This study analyzed the use of injectable drugs with oral-formulation alternatives in the outpatient setting in South Korea. We conducted a retrospective cross-sectional data analysis using 2008 National Health Insurance claims data. All active ingredients were categorized into dual-formulation ingredients (DFIs) and single formulation ingredients (SFIs), and were identified by the type of healthcare service provider (HSP) and anatomical therapeutic chemical (ATC) group. 14.6 % (102/701) of total drugs were extracted as DFIs at about the same rate as that for drugs in the World Health Organization database (14.45 %), showing similar patterns by ATC group. The rate of injectable drug use varied more substantially for DFIs (range 0.94-4.54 %) than for SFIs (range 0.27-1.12 %) by the type of HSP. For DFIs, the highest proportion of injectable drug use was observed in group H (all hormonal preparations, 22.74 %) and group M (anti-inflammatory and anti-rheumatic preparations, 10.23 %) among ATC groups. The proportion of injectable drug use was higher in clinics and small hospitals than in tertiary hospitals and general hospitals where patients with more severe cases tend to visit. The results imply the potentially inappropriate or excessive use of injectable drugs and suggest the need to develop standard guidelines for injectable drug use and strategies to promote high-quality healthcare including education on rational prescribing.