Date	Event	Description
30 September 2014	New search has been performed	We have updated the search and identified 6 new studies. We have included 3 new trials in the review (Munoz 2014; Reinhard 2012; Vallikkannu 2014), excluded 1 study (Guittier 2013) and identified 2 trial registrations for ongoing studies (Burgos 2012; Passerini 2013)
30 September 2014	New citation required but conclusions have not changed	Overall results are similar to those reported in the previous version of the review. A new author joined the review team to assist with the update. We have incorporated a summary of findings table
30 September 2011	New search has been performed	Search updated: 10 new trials added to review We have moved Andarsio 2000 from categorisation as an 'Included study' to 'Awaiting classification' because we need to know the route of administration of the drug before we can include data on subgroups in the updated review. We are trying to obtain this information
19 May 2011	New citation required and conclusions have changed	Beta stimulants are now recommended for facilitating external cephalic version at term, but data on adverse effects were insufficient. Data on calcium channel blockers and nitric acid donors were insufficient to provide good evidence New authors helped update this review
1 October 2009	Amended	Search updated: 19 reports added to Studies awaiting classification
3 November 2008	Amended	Converted to new review format
31 March 2004	New search has been performed	One new trial added to studies awaiting classification (Hollard 2003)
30 September 2003	New citation required and conclusions have changed	With inclusion of Bujold 2003a and Bujold 2003b, we have changed the recommendation regarding nitroglycerine
30 September 2003	New search has been performed	Search updated. 2 new trials included (Bujold 2003a; Bujold 2003b)