Dramatic change in prescribing of hormone replacement therapy in The Netherlands after publication of the Million Women Study: a follow-up study.
OBJECTIVE
To estimate the diffusion of new safety information concerning postmenopausal hormonal replacement therapy (HRT) into prescribing practice in The Netherlands and to assess the impact of revised guidelines on the long-term treatment of HRT.


METHODS
Cross-sectional study.


METHODS
Community pharmacy dispensing data from a population of approximately 450,000 patients in the northern and eastern part of The Netherlands.


METHODS
Women aged 45-69 years to whom at least one HRT prescription was dispensed between 1 January 2000 and 1 January 2004.


METHODS
Annual and quarter prevalences of HRT and the proportion of new HRT users, switchers and continuous HRT users per quarter.


RESULTS
The prevalence of HRT prescribing decreased significantly from 107/1000 [95% confidence interval (CI) 104, 110] in 2000 to 87/1000 (95% CI 84, 89) in 2003. The decreasing prevalence was especially evident among the younger age groups and was most pronounced among users of oestrogen/progestagen combinations. The publication of the Women Health Initiative Study (WHI) was followed by a modest decrease in prescribing of HRT, whereas prescribing of HRT declined dramatically after publication of the Million Women Study (MWS) in August 2003. Among the continuous HRT users in the 4th quarter of 2002, 55% used HRT longer than 3 years. This percentage was 53 in the 4th quarter of 2003.


CONCLUSIONS
In contrast to the release of the WHI study results, publication of the MWS was followed by a dramatic fall in prescribing of HRT in The Netherlands. Despite the new recommendation that long-term HRT use should be discouraged, the proportion of long-term users did not change after the publication of the MWS.
Faber
Adrianne
A
Groningen University Institute for Drug Exploration, University of Groningen, Department of Social Pharmacy, Pharmacoepidemiology and Pharmacotherapy, Groningen, The Netherlands.
Bouvy
Marcel L
ML
Loskamp
Linda
L
van de Berg
Paul B
PB
Egberts
Toine C G
TC
de Jong-van den Berg
Lolkje T W
LT
D000367:Age Factors; D000368:Aged; D003157:Community Pharmacy Services / Q000706:statistics & numerical data; D003430:Cross-Sectional Studies; D004059:Diffusion of Innovation; D011307:Drug Prescriptions / Q000706:statistics & numerical data; D004363:Drug Utilization / Q000706:statistics & numerical data*; D015914:Estrogen Replacement Therapy / Q000009:adverse effects / Q000706:statistics & numerical data*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008875:Middle Aged; D009426:Netherlands; D017698:Postmenopause; D017410:Practice Guidelines as Topic; D010818:Practice Patterns, Physicians' / Q000706:statistics & numerical data* / Q000639:trends; D012449:Safety; D016387:Women's Health