| CPC A61K 31/4965 (2013.01) [A61K 45/06 (2013.01); A61P 9/12 (2018.01)] | 5 Claims |

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1. A method of transitioning a patient being treated for pulmonary arterial hypertension with an oral non-selexipag prostacyclin pathway agent (PPA) to selexipag, comprising administering oral selexipag to the patient at a starting dose and increasing to a highest tolerable maintenance dose that is maintained for greater than about 14 days without change or interruption, wherein the patient was taking the non-selexipag PPA for about 30 or more days at the time of selexipag initiation and stopped the non-selexipag PPA less than about 7 days before the selexipag initiation, or wherein the patient continued taking the non-selexipag PPA at the time of selexipag initiation and subsequently stopped the non-selexipag PPA.
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