The effect of hyoscine butylbromide on the first stage of labour in term pregnancies.

Objective: To determine whether hyoscine butylbromide shortens the first stage of labour, without an increase in maternal or neonatal complications.

Design: Randomised, double-blinded, controlled trial.

Setting: The Antenatal clinics and Labour and Delivery ward of the University Hospital of the West Indies, Kingston, Jamaica.