Objective: To determine prescription contraceptive use in the UK.
Design: Observational study using a primary care database. SettingThe Health Improvement Network (THIN).
Population: Women in THIN aged 12-49years in 2008, registered with their primary care doctor for at least 5years, and with a prescription history of at least 1year were included.
Methods: THIN was searched using the Read and MULTILEX codes for the following methods: combined oral contraceptives (COCs), progestogen-only pills (POPs), copper intrauterine devices (Cu-IUDs), the levonorgestrel-releasing intrauterine system (LNG-IUS), progestogen-only implants, progestogen-only injections, and contraceptive patches.
Main outcome measures: Prevalence, switching, and duration of prescriptions.
Results: A cohort of 194054 women was identified. The prevalence of contraceptive use was: COCs, 16.2% (95%confidence interval, 95%CI 16.1-16.3%); POPs, 5.6% (95%CI 5.5-5.6%); Cu-IUD, 4.5% (95%CI 4.4-4.5%); LNG-IUS, 4.2% (95%CI 4.1-4.2%); progestogen-only implants, 1.5% (95%CI 1.5-1.6%); progestogen-only injections, 2.4% (95%CI 2.3-2.4%); and contraceptive patches, 0.1% (95%CI 0.1-0.2%). Within 1year, 9.8% of new COC users switched to alternative COCs, and 9.0% changed to a different method. Among new COC users who did not switch method, 34.8% did not continue use beyond 3months, and were no longer using a prescription contraceptive.
Conclusions: Among users of oral contraceptives who did not switch method, over one-third did not continue use beyond 3months. This supports current UK guidelines recommending a follow-up consultation with a healthcare professional 3months after the first prescription of COCs.
2014. Vol. 121, no 1, 53-61 p.
Contraceptives, discontinuation, prevalence, switching, The Health Improvement Network, UK