Background: A frequent obstetric practice known as induction of labour is carried out for both medical and non-medical reasons. Objective: To investigate how intravenous dexamethasone affects post-term primigravid women's active phase duration and the time between labour induction and the beginning of the active phase. Patients and Methods: This double blinded randomized, controlled study was conducted at tertiary care hospital at Ain Shams University Maternity Hospital from January 2022 till October 2022 and performed on total of 102 Primigravid post term pregnant women who underwent induction of labour. Results: The study stated that the 1^st and 2^nd stages of labour took a statistically shorter amount of time in the Dexamethasone than in the Control group, however the 3^rd stage of labour took a statistically non-significantly different amount of time in either group. Conclusion: With no difference in the negative effects on the mother or the fetus, dexamethasone 8 mg IV appears to shorten labour time, improve cervix ripening, and accelerate labour induction. It also appears to shorten the time between the first and second stages of labour.