A prescription survey in a hospital hypertension outpatient clinic

Abstract

Aims The objective of this study was to investigate drug utilization in the management of hypertension in Hong Kong.

Methods We conducted a prescription survey to examine the use of antihypertensive drugs in a hypertension clinic in a regional hospital and the resulting expenditure incurred. The use of concurrent medications such as antidiabetic drugs and lipid-lowering agents was also examined.

Results During a 7-week study period, 530 prescriptions were collected. All except 14 patients received antihypertensive drugs with 262 (50.8%) on monotherapy and 254 (49.2%) on combination therapy. Calcium channel blocking agents and β-adrenoceptor blocking agents were the two most popular antihypertensive drugs used in both monotherapy (38% and 31%, respectively) and combination therapy (27% and 33%, respectively). Forty-nine patients (19%) received three antihypertensive drugs or more. The number of antihypertensive drugs showed a significant positive correlation with the duration of attendance at the clinic (r=0.88, P<0.001). Of the total 530 prescriptions, 5.6% and 10% contained antidiabetic drugs and lipid-lowering agents, respectively. Calcium channel blocking agents, angiotensin converting enzyme (ACE) inhibitors and lipid lowering agents, accounted for 82% (HK$211 654; £1HK$12) of the total drug expenditure (HK$258 115). Seventy-nine percent of the lipid lowering agents prescribed were hydroxymethylglutaryl coenzyme A (HMG CoA) reductase inhibitors. Amlodipine accounted for 26% of usage but contributed to 41% of the overall costs of calcium channel blocking agents. α₁-adrenoceptor blocking agents were only used infrequently and were the most expensive class of drugs, due to the preferred use of doxazosin rather than prazosin which is far cheaper than the former.

Conclusions In view of the use of these often costly drugs for long-term therapy, monitoring of their use and its correlation with clinical outcomes and quality of life is essential to ensure the optimal use of health care resources.

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