Use of prescription contraceptive methods in the UK general population: a primary care study.

Abstract

To determine prescription contraceptive use in the UK. Observational study using a primary care database. The Health Improvement Network (THIN). Women in THIN aged 12-49 years in 2008, registered with their primary care doctor for at least 5 years, and with a prescription history of at least 1 year were included. 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. Prevalence, switching, and duration of prescriptions. A cohort of 194 054 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 1 year, 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 3 months, and were no longer using a prescription contraceptive. Among users of oral contraceptives who did not switch method, over one-third did not continue use beyond 3 months. This supports current UK guidelines recommending a follow-up consultation with a healthcare professional 3 months after the first prescription of COCs.