الفهرس 
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Abstract
Background: a normal pregnancy lasts 37 to 42 weeks, counting from the first day of the last menstrual period. A pregnancy that continues beyond 37 weeks is called a ”term” pregnancy. Preterm labor is defined as labor that begins before 37 weeks of pregnancy. Approximately 12 percent of babies in the United States are born preterm; 80 percent of these are due to preterm labor that occurs on its own or after preterm premature rupture of the fetal membranes (or ”broken bag of waters”). The remaining 20 percent are planned early deliveries that are done for maternal or fetal problems that prevent the woman from being able to safely continue with her pregnancy.
Aim of the Work: to assess the efficacy of sildenafil for stopping the labor for 48 hrs compared to nifedipine in women with preterm labor.
Patients and Methods: this prospective study was carried on pregnant women with preterm labor pain at Ain Shams University Hospital from March 2018 till September 2018. Study includes 88 patients which were distributed into two groups:
group S: received Sildenafil to stop preterm labor.
group N: received Nifedipine to stop preterm labor.
Results: in the present study we found that mean age in group receiving sildenafil (group S) was 26.55 years and in group receiving nifidpine (group N) was 26.75 years with insignificant differences between two groups as regard age p-value 0.798, also as regard BMI and parity there was insignificant differences between two groups as regard BMI p-value 0.727, 0.815 respectively, Mean Gestational age at admission was 27.1 weeks in group S and in group N was 28.16 with insignificant differences between two groups p-value 0.705.
Conclusion: administration of Sildenafil in women with preterm labor pain seems to be a promising future therapy of preterm labor with, limiting the teratogenic influence of the drugs on the fetus.