Objectives To assess whether changes in patterns of combined oral contraceptive (COC) prescriptions to starters between 2008 and 2016 were in line with changes in national recommendations for use.
Design Historical prospective cohort study.
Setting The national Norwegian Prescription Database.
Participants Women aged 10–49 years who started COCs between 1 January 2008 and 30 June 2016, in total 285 009 women.
Primary outcome The proportion of levonorgestrel-containing COC prescriptions to starters.
Intervention The Norwegian Medical Agency recommended levonorgestrel-containing COCs to starters from 2010 onwards.
Results The proportion of levonorgestrel-containing COCs prescribed to starters increased from 41% in 2008 to 80% in 2016 with the greatest increase from 2011 to 2012. This prescription pattern comprised all age groups but was observed to a lower extent among older women. Public health nurses and midwifes had the highest compliance with recommendations and prescribed levonorgestrel-containing COCs to 96% of starters aged <20 years in 2016, compared with 75% and 86% among general practitioners and doctors with no specialty.
Conclusion All professions have increased the proportion of levonorgestrel-containing COC prescriptions to starters. Public health nurses and midwives had the highest compliance with the new recommendations. Future studies will examine whether this shift in prescription pattern has prevented venous thromboembolism in women of reproductive age in Norway.
- hormonal contraception
- combined oral contraceptives
- venous thromboembolism
- physician prescription pattern
- women's health
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Contributors JE did the literature review and wrote the first draft. FES did all the formal applications, organised the data and did the analysis. JE had full access to the data. JE and FES revised the manuscript and approved the final version for submission.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent for publication Not required.
Ethics approval The NorPD board reviewed the study protocol and gave permission for the use of data (PDB 1459, saksnr. 16/12041). According to Norwegian legislation, studies using anonymous data from nationwide registers are exempt from institutional regulatory board approval and written informed consent from patients.
Provenance and peer review Not commissioned; externally peer reviewed.
Data availability statement Data may be obtained from a third party and are not publicly available.
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