The effect of Hyoscine -suppository on labor

INTERVENTION: hyoscine suppositiry 20 mg single dose Intervention 1: hyoscine suppositiry 20 mg single dose. Intervention 2: placebo suppository. placebo suppository CONDITION: Condition 1: Labor pain. Condition 2: Labor process. ; spontaneus vertex delivery ; spontaneus vertex delivery spontaneus vertex delivery PRIMARY OUTCOME: Cervical dilatation. Timepoint: each 1 h. Method of measurement: examination. Cervical effacement. Timepoint: each 1 h. Method of measurement: examination. Delivery type. Timepoint: at the end. Method of measurement: observation. Labor active phase duration. Timepoint: at the end. Method of measurement: observation. Labor pain. Timepoint: each 0.5 h. Method of measurement: visual analog scale. Labor second stage duration. Timepoint: at the end. Method of measurement: observation. SECONDARY OUTCOME: Fetal heart rate. Timepoint: each 0.5 h. Method of measurement: examination. Maternal blood pressure. Timepoint: each 0.5 h. Method of measurement: examination. Maternal pulse rate. Timepoint: each 0.5 h. Method of measurement: examination. Neonatal Apgar score. Timepoint: at 1st and 5th minutes. Method of measurement: Examination & Ovservation. INCLUSION CRITERIA: INCLUSION CRITERIA: 1.age 18‐35 2. gestational age: 37‐42 by LMP or under 26 weeks by sonography 3.single fetus 4. cephalic presentation 5.cervical dilatation= 3‐4 cm 6. Cervical effacement = 30‐60% 7.bishop score>7 8.spontaneous uterine contractions in the form of 3 contractions with 40 minutes duration per 10 min 9.minimum education= grade 5 at primary school. Exclusion criteria : 1.vaginal bleeding 2.abnormal fetal heart rate 3.neonatal body weight<2500 or >4000 gr 4.fetal abnormality or death 5.high risk pregnancy 6.history of uterine surgery 7.mother's tachycardia 8.history of medical disorder in mother 9.oxytocin infusion in labor stages 10.use of Narcotic or anodyne drug or other pain reliever methods 11.delivery in 2 hours from onset of study 12.Athletic mothers 13.addict mothers 14.Corporation in pre‐labor education classes