NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

Epoprostenol (Flolan) is the correct answer because it is used for continuous intravenous infusion in the treatment of pulmonary arterial hypertension (PAH) as a prostacyclin analogue. Prostacyclin analogues help to dilate blood vessels, prevent blood clotting, and improve symptoms in patients with PAH.

Options A, C, and D (Bosentan, Ambrisentan, Macitentan) are incorrect because they are endothelin receptor antagonists used for the treatment of PAH but are not administered via continuous intravenous infusion like epoprostenol. These drugs work by blocking the effects of endothelin, a substance that narrows blood vessels and worsens PAH symptoms but are not prostacyclin analogues used for continuous IV infusion.