Preferred embodiments of the present invention are related to novel therapeutic drug combinations and methods for treating and/or preventing pulmonary arterial hypertension and/or stable angina. More particularly, aspects of the present invention are related to therapeutic combinations comprising a Rho-kinase inhibitor, such as fasudil, and one or more additional compounds selected from the group consisting of prostacyclins, such as iloprost, endothelin receptor antagonists, PDE inhibitors, calcium channel blockers, 5-HT2A antagonists, such as sarpogrelate, selective serotonin reuptake inhibitors, such as fluoxetine, statins, and vascular remodeling modulators, such as Gleevec.