Objective: The object of this study was to determine the effects of maternal tocolysis with glycerol trinitrate (GTN) patches on the neurodevelopment of infants.Study design: This was a randomized, multicenter, controlled trial comparing the efficacy of GTN patches with standard beta 2 agonist as tocolytic therapy. The previously reported outcomes of this study indicated no difference in neonatal mortality or morbidity to hospital discharge. One hundred fifty-six surviving infants from 2 Australian centers were psychometrically assessed using the Griffiths Mental development Scales (revised) at 18 months of age.Results: There was no difference in psychometric performance between those infants enrolled in either the GTN (81 infants) or beta 2 agonist (75 infants) arm of the study.Conclusion: This randomized trial supports no significant difference between GTN patches in comparison with standard beta 2 agonist for tocolytic therapy. The results underscore the association between premature labor and adverse infant outcomes. (c) 2006 Mosby, Inc. All rights reserved.