To effectively treat patients diagnosed with drug-resistant (DR) tuberculosis (TB) and protect the population from further transmission of this infectious disease, an uninterrupted supply of quality-assured (QA), second-line anti-TB drugs (SLDs) is necessary. Patients diagnosed with multidrug-resistant tuberculosis (MDR TB)--a disease caused by strains of Mycobacterium tuberculosis (M.tb.) resistant to two primary TB drugs (isoniazid and rifampicin)--face lengthy treatment regimens of 2 years or more with daily, directly observed treatment (DOT) with SLDs that are less potent, more toxic, and more expensive than those used to treat drug-susceptible TB. From 2000 to 2009, only 0.2-0.5 percent of the estimated 5 million MDR TB cases globally were treated with drugs of known quality and in programs capable of delivering appropriate care (Keshavjee, 2012). The vast majority of MDR TB patients either died from lack of treatment or contributed to the spread of MDR TB in their communities. A strengthened global supply chain for SLDs could save lives by consistently delivering high-quality medicines to more of the people who need them.