The review conducted by WHO is a descriptive study for which the information was collected from standardized questionnaires sent to a large number of donors, consolidators and recipients of drug donations. The information obtained through these questionnaires includes self-reported data, experiences and opinions of the respondent organizations or individuals. These data were supplemented by information already available in WHO/DAP. If clarification was needed, additional information was obtained through direct interviews with respondents, and through reports and literature reviews. The observations and conclusions derived from the questionnaires were validated with key informants and experts. The data collected do not provide an independent and objective assessment of the impact of drug donations, but represent the opinions and experiences of a large number of organizations and experts dealing with drug donations.