The growing burden of mental, neurological and substance use (MNS) disorders in low-resource settings has prompted efforts to integrate mental health into primary health care (PHC). This study evaluated the implementation and outcomes of a large-scale mhGAP training initiative under the Mental Health in Primary Care (MeHPriC) program in Lagos State, Nigeria. A total of 852 PHC workers from 57 facilities completed a 5-day mhGAP training and a 1-day refresher session. Using a pre-post mixed-methods design, we assessed changes in knowledge, stigma, clinical practice and self-efficacy, with follow-up at five months. Quantitative findings revealed significant improvements in knowledge and attitudes, with enhanced clinical practice reported by 69.1% of participants. Supervision, knowledge gains and self-efficacy emerged as predictors of improved practice. Qualitative data, analyzed using the Consolidated Framework for Implementation Research (CFIR), highlighted increased confidence, reduced stigma and the enabling role of supervision and peer support, alongside persistent barriers such as medication stock-outs and limited referral networks. The study offers robust evidence for the effectiveness of task-sharing approaches when supported by contextual adaptation and system-level readiness. The MeHPriC model demonstrates that government-led mhGAP scale-up in PHC is both feasible and impactful, offering a replicable pathway for mental health integration in other LMICs.

Background: Acquiring proficiency in motivational interviewing (MI) may be more difficult than generally believed, and training research suggests that the standard one-time workshop format may be insufficient. Although nurses represent one of the professions that have received most training in MI, training in this group has rarely been systematically evaluated using objective behavioral measures. Aims: To evaluate an enhanced MI training program, comprising a 3.5-day workshop, systematic feedback on MI performance, and four sessions of supervision on practice samples. Methods: Nurses (n = 36) in Swedish child health services were trained in MI. Skillfulness in MI was assessed using the Motivational Interviewing Treatment Integrity (MITI) Code. Effects of training were compared to beginning proficiency thresholds. Results: Participants did not reach beginning proficiency thresholds on any of the indicators of proficiency and effect sizes were small. Conclusions: The present study adds to a growing body of literature suggesting that the current standard MI training format may not provide practitioners with enough skillfulness. Moreover, the results indicate that even enhanced training, including systematic feedback and supervision, may not be sufficient. Suggestions for improved MI training are made.