Essential medicines are a vital component of the Sustainable Development Goals (SDGs) to 'ensure access to safe, effective, quality, and affordable essential medicines and vaccines for all'. However, significant demand, limited funds, and high prices contribute to frequent shortages of drugs in many public health programmes. One of the mechanisms for financing drugs and other pharmaceutical supplies has been the establishment of Revolving Drug Funds (RDFs) in which, after an initial capital investment, drug supplies are replenished with monies collected from the sales of drugs. Successful...