Overview The Effect of Hypertension Medications on Renal Blood Flow Measurements in Healthy Males (MK-0000-127) Status: Completed Trial end date: 2010-04-01 Target enrollment: Participant gender: Summary This study will evaluate the effect of Aliskiren and Losartan on renal blood flow using PAH clearance, PC MRA and ASL MRI methodologies. Phase: Phase 1 Details Lead Sponsor: Merck Sharp & Dohme Corp.Treatments: Losartan