Prescription contraception use and adherence by women with substance use disorders

Background and Aims Unintended pregnancy rates are high among women with substance use disorders (SUDs), which could be explained partly by lower use of and adherence to contraception. We aimed to test: (1) the association of SUD with prescription contraceptive use, contraceptive method selection and adherence; (2) whether practices participating in the Patient‐Centered Medical Home Initiative (PCMHI) had better contraceptive use and adherence for patients with SUD; and (3) for differences in the association of SUD with adherence by type of contraceptive used. Design Retrospective cohort analysis of claims and encounter data. Setting Massachusetts, USA. Participants A total of 47 902 women aged 16–45 years enrolled in Medicaid or Commonwealth Care in Massachusetts between 2010 and 2014. Measurements We examined three dependent variables: (1) use of a reversible prescription contraceptive during 2012; (2) the contraceptive methods used; and (3) the proportion of days covered by a prescription contraceptive in the year following the first prescription contraceptive claim. The primary predictor was diagnosed SUD, defined as at least one claim for an alcohol or drug use disorder. Findings SUD was associated with lower rates of prescription contraceptive use during 2012 [19.2 versus 23.9%; adjusted odds ratio (aOR) = 0.79, P