Strengthening health systems to provide equitable, sustainable health care has been identified as essential for improving maternal and reproductive health. Many donors and non-governmental organizations (NGOs) have contributed to undermining health system strengthening, however, through adhering to what Swidler and Watkins call the “sustainability doctrine,” policies that prioritize time-limited, targeted interventions best suited for short-term funding streams, rather than the long-term needs of local populations. This chapter presents ethnographic data from semi-structured and key informant interviews with 16 policymakers and NGO directors in Dar es Salaam, Tanzania from 2011 to 2012. I illustrate how sustainability doctrine policies were put into practice, and how they have persisted, despite their shortcomings, using examples of donor-prioritized maternal healthcare initiatives in Tanzania rolled-out several years apart: prevention of mother-to-child transmission of HIV (PMTCT) and basic emergency obstetric and newborn care (BEmONC) programs in the late 2000s, and more recent efforts to implement respectful maternity care (RMC) programs. I focus on several issues informants identified as crippling efforts to build strong health systems, particularly the internal brain drain of healthcare workers from the public sector to higher-paying NGO jobs, and the prioritization of types of programs donors believed could be sustained after the funding period ended, specifically trainings and workshops. I describe how despite these issues, international organizations still design and implement less effective programs that often fail to account for local circumstances in their efforts to solve some of the more intractable health issues facing Tanzania today, in particular, the country’s stagnating maternal mortality rate. In this chapter, I argue that practices promoted and implemented under the guise of “sustainability” in policy papers and reports generated by donors paradoxically contribute to health system precarity in Tanzania.