The effect of hyoscine butylbromide for shortening active phase of the first stage of labor : double blind placebo-controlled trial

INTERVENTION: Placebo Comparator Drug hyoscine butylbromid injection when cervical dilatation 5‐6 cm in low risk singelaton pregnancy that plan vaginal route delivery hyoscine butylbromide CONDITION: Singleton pregnancy in first stage of nplabor that plan vaginal delivery ; hyoscine butyl bromide; duration of labor; pregnancy hyoscine butyl bromide; duration of labor; pregnancy PRIMARY OUTCOME: Duration in active phase of. 1 stage of labor since intervention/control drug was injected duration time (minute) SECONDARY OUTCOME: Duration in second stage of labor since cervical fully dilate to fetus was deliveried Duration time (minute),duration in third stage of labor since fetus was deliveried until placenta was deliveried dutation time(minute),maternal adverse event since drug was injected until post partum 24 hr have/no have,neonatal outcome at 1,5 min APGAR score INCLUSION CRITERIA: Singleton pregnant women >18 years old term pregnancy with a cephalic presentation and planned vaginal delivery