A randomized, single blind clinical trial, was performed. Inclusion criteria were all pregnant women admitted at Pereira Rossell Hospital Center with gestational ages between 32/0 and 41/6 according to first trimester sonogram, with a viable fetus in cephalic presentation, with estimated fetal weight lower than 4000 gr, without contraindications for vaginal birth, to whom induction of labor with misoprostol had been previously indicated, from 8 to 20 hours 7 days a week. Protocol counted with approval of the Ethics Commission of the Pereira Rossell Hospital. All participants gave written informed consent before the study began. Once there was confirmation that the patient met the inclusion criteria, information was given and consent form was signed, the patient entered the study and the intervention was randomized. Randomization was computer generated in permuted blocks of 2 by an epidemiologist from our Service, and the result was in a sealed and opaque envelope which was opened at the time of administering the medication. Prior to administration of the medication, an Obstetrician or Obstetrics resident who was not familiar with the administration route assigned to the patient assessed through vaginal examination the characteristics of the cervix in terms of Bishop score. Afterwards, a technician from the investigation team administered the misoprostol according to the assigned route (50 µg misoprostol vaginal or sublingual).