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DORADO-AC-EX - A Long-Term Safety Extension Study to the Phase 3 DORADOC-AC Study (Protocol DAR-312) of Darusentan in Resistant Hypertension (Darusentan)

This study has been terminated.
(Study DAR-312 did not meet its primary co-endpoints.)
Information provided by (Responsible Party):
Gilead Sciences Identifier:
First received: October 17, 2006
Last updated: January 3, 2014
Last verified: January 2014
This is a double-blind, active-controlled, long-term study of a new experimental drug called darusentan. Darusentan in not currently approved by the United States Food and Drug Administration (FDA), which means that a doctor cannot prescribe this drug. The purpose of this study is to evaluate the long-term safety of darusentan (optimized dose) as compared to an active control, administered orally.

Condition Intervention Phase
Hypertension Drug: Darusentan Drug: Guanfacine Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Double-Blind, Active-Controlled, Long-Term Safety Extension Study of Optimized Doses of Darusentan in Subjects With Resistant Hypertension Despite Receiving Combination Therapy With Three or More Antihypertensive Drugs, Including a Diuretic, as Compared to Guanfacine (Protocol DAR-312-E)

Resource links provided by NLM:

Further study details as provided by Gilead Sciences:

Primary Outcome Measures:
  • Change from baseline in mean 24-hour systolic and diastolic ambulatory blood pressure [ Time Frame: Baseline to Week 14 ]
  • Percentage of subjects who reach systolic blood pressure goal [ Time Frame: Week 14 ]
  • Change from baseline in estimated glomerular filtration rate (eGFR) [ Time Frame: Baseline to Week 14 ]

Secondary Outcome Measures:
  • Change from baseline in trough sitting systolic and diastolic blood pressures [ Time Frame: Baseline to Week 14 ]

Enrollment: 661
Study Start Date: May 2007
Study Completion Date: May 2010
Primary Completion Date: February 2010 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Darusentan
Darusentan capsules titrated to an optimal dose of 50 mg, 100 mg, or 300 mg administered orally once daily
Drug: Darusentan
Darusentan capsules at a dose of 50, 100, or 300 mg administered orally once daily
Other Name: LU 135252
Active Comparator: Guanfacine
Guanfacine 1 mg capsules administered orally once daily
Drug: Guanfacine
Guanfacine 1 mg capsules administered orally once daily


Ages Eligible for Study:   35 Years to 80 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No


  1. Subjects must be competent to provide written informed consent;
  2. Subjects must have completed the Maintenance Period of the DAR-312 study.


  1. Subjects who discontinue treatment with study drug prior to the end of the Maintenance Period in DAR-312 due to a study drug-related AE;
  2. Subjects who experience a study drug-related serious adverse event (SAE) during the DAR-312 study.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00389675

  Show 99 Study Locations
Sponsors and Collaborators
Gilead Sciences
  More Information

Additional Information:
Responsible Party: Gilead Sciences Identifier: NCT00389675     History of Changes
Other Study ID Numbers: Protocol DAR-312-E
Study First Received: October 17, 2006
Last Updated: January 3, 2014

Additional relevant MeSH terms:
Vascular Diseases
Cardiovascular Diseases
LU 135252
Antihypertensive Agents
Adrenergic alpha-2 Receptor Agonists
Adrenergic alpha-Agonists
Adrenergic Agonists
Adrenergic Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action
Physiological Effects of Drugs
Endothelin Receptor Antagonists processed this record on August 22, 2017