By Philippa Roxby
Health reporter, BBC News
At the Moi Teaching and Research Hospital in Eldoret, Kenya, pharmacists have a "drawer of shame".
In it, they put drugs which look suspicious, because they are either fake or of poor quality.
Rather than making people better, poor quality medicines prolong their sickness, often cause side-effects and increase the risk of drug resistance - leading to more illness and deaths, particularly among children.
While counterfeit medicines are deliberately mislabelled and mis-sold by criminals, poor quality pharmaceuticals are a silent killer because they look genuine.
Read more: http://www.bbc.com/news/health-32938075