Ketamine drug use ‘harms memory’. bbcnews. November 17, 2009. Frequent use of ketamine – a drug popular with clubbers – is being linked with memory problems, researchers say. The University College London team carried out a range of memory and psychological tests on 120 people. They found frequent users performed poorly on skills such as recalling names, conversations and patterns. Previous studies said the drug might cause kidney and bladder damage. The London team and charity Drugscope said users should be aware of the risks. [ See ]