2. Methods
2.1. Search strategy
The search strategy employed was adapted from a similar systematic review completed for the Cochrane Library and followed the methodology applied in previous reviews by the authors that looked into the effectiveness of antipsychotics, antidepressants and mood stabilisers in adults with ID and problem behaviours. Electronic databases of journal articles, namely PsycInfo, MEDLINE, EMBASE, and CINAHL, were the primary focus of the search. In addition, cross-referencing of pertinent reviews and a hand search for relevant literature was completed to ensure that all relevant articles were identified.