Anticholinergics for Cervical Edema in Labor

Diphenhydramine 50mg IV will be administered within 1 hour of the cervical exam which diagnosed prolonged active phase of labor

Participants will receive cervical exams every 2 hours in active labor, placement of intrauterine pressure catheter, up titration of Pitocin if contractions are inadequate, maternal repositioning, and use of adjunct devices such as a peanut ball.