the use of prostaglandin synthetase inhibitors ( indomethacin and ibuprofen ) for greater than 72 h in women with preterm labour ( n = 67 ) was significantly ( p less than 0.001 ) associated with ultrasound-recorded oligohydramnios compared with the use of ritodrine or magnesium sulphate ( control group , n = 67 ) .
C0022876
preterm labour
C0035661
ritodrine