RESUMEN
OBJECTIVES: Our study aimed to describe users of a free online contraception service, compare online emergency contraceptive pill (ECP) users with online oral contraceptive (OC) users, and describe patterns of use of online ECP and OC over time, including transition from ECP to more effective forms of contraception. STUDY DESIGN: Analysis of routinely collected, anonymized data from a large, publicly funded, online contraceptive service in the United Kingdom from April 1, 2019 to October 31, 2021. RESULTS: The online service provided 77,447 prescriptions during the study period. About 84% for OC and 16% for ECP, of which 89% were ulipristal acetate. ECP users were younger, lived in more deprived areas, and were less likely to be of white ethnicity than OC users. About 53% ordered OC only, but 37% ordered both ECP and OC. Among those prescribed both OC and ECP (n = 1306), 40% had one method as dominant, 25% appeared to move from one method to the other (11% ECP to OC, 14% OC to ECP), and 35% continued to use both methods. CONCLUSIONS: Online services are accessible to diverse young populations. While the majority of users order OC only, our study suggests that where there is free, online access to both OC and ECP, and those ordering ECP are always offered free OC, transition to more effective ongoing forms of contraception is uncommon. Further research is needed to understand whether online access to ECP increases its attractiveness and reduces likelihood of transition to OC. IMPLICATIONS: This study demonstrates that free, online contraceptive services are accessible to ethnically and socioeconomically diverse users. It identifies a subgroup of contraceptive users who combine use of OC and ECPs over time, and suggests that improved access to ECP may alter contraceptive choices.