Treprostinil diolamine is the first oral dosage preparation of a prostacyclin analogue for use in treatment naive pulmonary arterial hypertension (PAH). This case series and review of the available literature describes the experience of patients with PAH receiving treprostinil by intravenous (IV), subcutaneous (SQ), or inhalation route who were transitioned to treprostinil diolamine. At our institution, 3 patients were transitioned to treprostinil diolamine who received treprostinil administered by each of the alternative routes: IV, SQ, and inhalation. All patients tolerated the transition without significant worsening of disease end points. In the literature, 5 additional reports representing 48 patients were transitioned to treprostinil diolamine from an alternate route of administration. A majority (92%) of patients were hospitalized during the cross-titration phase and tolerated the transition without changes in disease markers or significant adverse effect. Six (13%) patients required reinitiation of parenteral therapy due to clinical decline. The most common dosing frequency utilized for treprostinil diolamine was 3 times per day. In patients with stable PAH receiving parenteral or inhaled treprostinil, a transition to treprostinil diolamine was a safe approach in a highly select population meeting clinical end points. Additional studies are required to further describe this clinical strategy before accepted in clinical practice
