Stock-Outs of Essential Medicines Among Community Health Workers (CHWs) In Low- And Middle-Income Countries (LMICs): A Systematic Literature Review of The Extent, Reasons, And Consequences

Abstract Background: This paper explores the extent of community-level stock-out of essential medicines among Community Health Workers (CHWs) in Low- and Middle-Income Countries (LMICs) and identifies the reasons for and consequences of essential medicine stock-outs. Methods: A systematic review following Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines was conducted. Five electronic databases were searched with a prespecified strategy and the grey literature examined, January 2006 - March 2021. Papers containing information on (i) the percentage of CHWs stocked out or (ii) reasons for stock-outs along the supply chain and consequences of stock-out were included and appraised for risk of bias. Outcomes were quantitative data on the extent of stock-out, summarized using descriptive statistics, and qualitative data regarding reasons for and consequences of stock-outs, analyzed using thematic content analysis and narrative synthesis. Results: Two reviewers screened 1083 records; 78 evaluations were included. Over the last fifteen years, CHWs experienced stock-outs of essential medicines nearly one third of the time and at a significantly (p < 0.01) higher rate than the health centers to which they are affiliated (28.93% [CI 95%: 28.79 - 29.07] vs 9.17 % [CI 95%: 8.64 - 9.70], respectively). A comparison of the period 2006-2015 and 2016-2021 showed a significant (p < 0.01) increase in CHW stock-out level from 26.36% [CI 95%: 26.22 -26.50] to 48.65% [CI 95%: 48.02- 49.28] while that of health centers increased from 7.79% [95% CI: 7.16 - 8.42] to 14.28% [95% CI: 11.22- 17.34]. Distribution barriers were the most cited reasons for stock-outs. Ultimately, patients were the most affected: stock-outs resulted in out-of-pocket expenses to buy unavailable medicines, poor adherence to medicine regimes, dissatisfaction, and low service utilization. Conclusion: Community-level stock-out of essential medicines constitutes a serious threat to achieving universal health coverage and equitable improvement of health outcomes. This paper suggests stock-outs are getting worse, and that there are particular barriers at the last mile. There is an urgent need to address the health and non-health system constraints that prevent the essential medicines procured for LMICs by international and national stakeholders from reaching the people who need them the most.