Study	Reason for exclusion
Denmark 1990	This trial compared light and electron microscope changes in the placenta and umbilical cord of 28 women with pregnancy‐induced hypertension randomised to intravenous and oral magnesium sulphate or placebo. This trial may be considered for inclusion in a future update of the Duley 2010 Cochrane review.
Denmark 1991	This trial recruited 58 women with pregnancy‐induced hypertension to determine effects of intravenous and oral magnesium versus placebo on maternal blood pressure. This study may be considered for inclusion in a future update of the Duley 2010 Cochrane review.
Detroit 1999	This trial assessed the effects of intravenous magnesium sulphate on fetal heart rate parameters.
India 2012	This randomised trial recruited 48 women with gestational age greater than 34 weeks with mild pre‐eclampsia or gestational hypertension and randomly assigned them to receive either intravenous magnesium sulphate or placebo, to assess the effects on fetal umbilical artery and middle cerebral artery blood flow. This trial may be considered for inclusion in a future update of the Duley 2010 Cochrane review.
ISRCTN03989660	This study will assess the effects of oral magnesium supplementation on pregnancy‐related leg cramps, which is the focus of another relevant Cochrane review (Garrison 2012).
NCT01709968	This study will assess the effects of oral magnesium supplementation on pregnancy‐related leg cramps, which is the focus of another relevant Cochrane review (Garrison 2012).
Norway 2008	This study examined the effects of oral magnesium supplementation on pregnancy‐related leg cramps and has been assessed in the relevant Cochrane review (Garrison 2012).
Sweden 1987	This randomised controlled trial randomised 60 pregnant women to either calcium or ascorbic acid (1 g twice daily) as treatment for leg cramps. There was no magnesium arm in this trial.
Sweden 1995	This study examined the effects of oral magnesium supplementation on pregnancy‐related leg cramps and has been assessed in the relevant Cochrane review (Garrison 2012).