Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 41 2 2003 06 15 126 131 Behrad V Moossavifar N Mojtahedzadeh M Esmaili H Moghtadeii P 2015 09 28 At present, many drugs are used for inhibition of uterine contractions, but the proportions of preterm labors are increasing. Although magnesium sulfate is the most commonly prescribed parenteral tocolytic agent, but it’s optimal use has yet to be delineated. In this study a high-dose protocol for magnesium sulfate tocolytic therapy was compared with a low-dose regimen. One hundred patients admitted to labor unit of Imam Reza's Hospital with preterm labor were enrolled in the trial. The median times to successful tocolysis were 8 hours in the low-dose group and 4 hours in the high-dose group (P https://acta.tums.ac.ir/index.php/acta/article/view/2648 https://acta.tums.ac.ir/index.php/acta/article/download/2648/2630