 - If currently receiving treatment with or taking any of the following, willing and able to discontinue for 30 days before Screening and throughout the entire study including the follow-up period: phosphodiesterase PDE 5 inhibitor eg, Viagra, Cialis, Levitra, or RevatioTM, any PDE 3 inhibitor eg, cilostazol, milrinone, or vesnarinone, pentoxifylline Trental, nitrates, L-arginine, ginkgo biloba, or HeartBar 