Provided in some embodiments are titration packages, kits, and methods of treating pulmonary arterial hypertension comprising prescribing and/or administering to a patient in need thereof 2-(((1r,4r)-4-(((4-chlorophenyl) (phenyl)carbamoyloxy)methyl)cyclohexyl)methoxy)acetic acid (Compound 1), or a pharmaceutically acceptable salt, hydrate, or solvate thereof, via a titration scheme that comprises the up-titration of Compound 1, or a pharmaceutically acceptable salt, hydrate, or solvate thereof, over a period of no more than about nine weeks until an optimized dose is administered.