Access to safe medicines is a major global public health challenge. Today, one-third of the world's population lacks access to essential medicines. And in parts of Africa almost half the population cannot get necessary drugs. Each year, more than 10 million children die before the age of five from diseases and conditions that are largely preventable, or easily treated with medicines. In sub-Saharan Africa, a mother in a rural community may walk hours to reach the nearest clinic, only to be told the medicines she needs to treat her sick child are not available.