Effect of Premedication Hyoscine-N-Butylbromide before Hysterosalpingography for Diagnosis of Proximal Tubal Obstruction in Infertile Women: A Randomized Double-Blind Controlled Trial.

Study Objective: To assess the effect of hyoscine-N-butylbromide (HBB) as premedication on the rate of proximal tubal obstruction during hysterosalpingography (HSG).

Design: A randomized, double-blind controlled trial (Canadian Task Force classification I).

Setting: The Infertility Clinic of Songklanagarind Hospital.