• The Cochrane Handbook for Systematic Reviews of Interventions includes guidance on incorporating adverse effects in systematic reviews (Chapter 19). 
• PRISMA harms checklist: improving harms reporting in systematic reviews. Published in the BMJ http://www.bmj.com/content/352/bmj.i157  
• Overview: comprehensive and carefully constructed strategies are required when conducting searches for adverse effects data. Golder S, Peryer G, Loke YK.J Clin Epidemiol. 2019 Sep;113:36-43. doi: 10.1016/j.jclinepi.2019.05.019. Epub 2019 May 28.
• A discussion paper on the methods used has also been published in BMC Medical Research Methodology: Loke  YK, Price D, Herxheimer A. Systematic reviews of adverse effects: framework for a structured approach BMC Med Res Methodol 2007;7:32.
• Cochrane hosts a dedicated Cochrane Training website, containing online training modules on different aspects of conducting a Cochrane systematic review.
• Cochrane also hosts Cochrane Learning Live which contains webinars on adverse effects such as Adverse effects 1: How to overcome the challenge of reviewing adverse effects and Adverse effects 2: Searching for adverse effects
• The ORBIT Matrix Generator is a tool is for identifying missing outcome data at the study level in a review. It adjusts for outcome reporting bias in trials and can easily be applied by non-methodologists. 
• CONSORT-Harms extension improving the reporting of harms related data in RCTS. This is soon to be updated.