Asthma or history of asthma, epilepsy or history of epilepsy, glaucoma or raised IOP, compromised CV, hepatic or renal function, HTN, ruptured chorioamniotic membranes; known history of hypertonic uterine contractility or tetanic uterine contractions; patients w/ multiple pregnancy. Monitor uterine activity, fetal heart rate & cervical dilation during therapy. Evaluate cephalopelvic relationships prior to use. Women ≥35 yr & w/ gestational age >40 wk. Not to be used during pregnancy.