As the efficacy of oxytocin administered through using ampoules and syringes (referred to as “standard oxytocin”) or through Uniject (referred to as “Uniject”) is similar, the main advantage of Uniject would be its potential, due to its ease of use,[16–18] to increase the proportion of women who receive oxytocin for prevention of PPH after delivery. This evidence concerns the gene OXT and pulmonary arterial hypertension.