Melatonin and Nighttime Blood Pressure in African Americans

This study has been completed.
National Center for Complementary and Integrative Health (NCCIH)
Information provided by (Responsible Party):
Frederic Rahbari-Oskoui, MD, MSCR, Emory University Identifier:
First received: April 29, 2010
Last updated: October 3, 2014
Last verified: October 2014
This purpose of this study is to test the effect of oral melatonin supplementation (8 mg per night for 4 weeks) on nighttime blood pressure in African Americans with a history of elevated nighttime blood pressure.

Condition Intervention Phase
Drug: melatonin
Drug: Placebo pills
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double Blind (Subject, Investigator)
Primary Purpose: Treatment
Official Title: Melatonin and Nighttime Blood Pressure in African Americans

Resource links provided by NLM:

Further study details as provided by Emory University:

Primary Outcome Measures:
  • Nighttime systolic blood pressure ( based on 24h ambulatory blood pressure monitoring) [ Time Frame: After 4 weeks of treatment ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Daytime Systolic blood pressure (based on 24h ambulatory blood pressure monitoring) [ Time Frame: After 4 weeks of treatment ] [ Designated as safety issue: No ]
  • Sleep duration and quality [ Time Frame: After 4 weeks of treatment ] [ Designated as safety issue: No ]
  • Urinary catecholamines [ Time Frame: After 4 weeks of treatment ] [ Designated as safety issue: No ]
  • Markers of endothelial function (E-Selctin and P-selectin) [ Time Frame: After 4 weeks of treatment ] [ Designated as safety issue: No ]
  • Melatonin-related side effects [ Time Frame: After 4 weeks of treatment ] [ Designated as safety issue: No ]

Enrollment: 38
Study Start Date: March 2010
Study Completion Date: July 2014
Primary Completion Date: July 2014 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: Melatonin
Nightly dose of Melatonin 8 mg for 4 weeks.
Drug: melatonin
8 mg time-release melatonin pills, once per night for 4 weeks
Placebo Comparator: Placebo pills
Placebo pill at 8 mg on a nightly dose for 4 weeks.
Drug: Placebo pills
Placebo pills, once per night for 4 weeks

Detailed Description:

The main outcome of interest is the mean nighttime blood pressure. We are also trying to see the mechanism of action of melatonin on blood pressure by analyzing data from sleep studies (to see if Melatonin lower blood pressure by providing a better quality of sleep or is that independent of the quality of sleep.

We are also looking into the effect of melatonin on sympathetic nervous system by measuring urinary catecholamines.

Finally, we are looking into changes in vascular biology markers P-selectine and e-selectine) on Melatonin.


Ages Eligible for Study:   18 Years to 64 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Males or females ages 18 to 64
  • Prior history of elevated nighttime BP (>125 mmHg SBP)
  • Taking no more than 2 antihypertensive medications
  • African-American race (self-defined by the participant)

Exclusion Criteria:

  • Secondary forms of hypertension
  • Presence of other diseases requiring treatment with BP lowering medications
  • Known cardiovascular disease (including history of angina pectoris, heart failure, presence of a cardiac pacemaker, history of myocardial infarction or revascularization procedure, or cerebrovascular disease, including stroke and TIA)
  • Diabetes mellitus (type 1 or 2)
  • Cancer/Malignancy other than nonmelanoma skin cancer
  • Primary renal disease
  • Serum creatinine > 1.5 in men or > 1.4 in women
  • Severe anemia
  • Liver enzymes > 2.5 upper limits of normal
  • Hepatitis B, Hepatitis C, or HIV positive as assessed by questionnaire
  • Current treatment with or regular use of calcium channel blocking agents, COX2-inhibitors, oral contraceptives, estrogen, sildenafil, vardenafil, tadalafil, antidepressants, corticosteroids, or warfarin
  • Current use of melatonin or any sleep aids containing melatonin.
  • Regular consumption (1 or more times per week) of any of the following of Vitamin methyl B12, St.

Johns Wort, Feverfew, black and white mustard seeds, wolf berry seed

  • Sleep apnea
  • Night work
  • Women who are pregnant, breast-feeding, attempting conception, or planning to attempt conception over the next 6 months.
  Contacts and Locations
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Please refer to this study by its identifier: NCT01114360

United States, Georgia
Emory University
Atlanta, Georgia, United States, 30322
Sponsors and Collaborators
Emory University
National Center for Complementary and Integrative Health (NCCIH)
Principal Investigator: Frederic F Rahbari Oskoui, MD, MSCR Emory University
Principal Investigator: Arlene Chapman, M.D. Emory University
Principal Investigator: Donald Bliwise, Ph.D. Emory University
  More Information

No publications provided

Responsible Party: Frederic Rahbari-Oskoui, MD, MSCR, Assistant Professor of Medicine, Emory University Identifier: NCT01114360     History of Changes
Other Study ID Numbers: IRB00021300, 1R21AT004509-01A2
Study First Received: April 29, 2010
Last Updated: October 3, 2014
Health Authority: United States: Food and Drug Administration

Keywords provided by Emory University:
Blood Pressure
Sympathetic Nervous System
Endothelial function
African American

Additional relevant MeSH terms:
Central Nervous System Agents
Central Nervous System Depressants
Molecular Mechanisms of Pharmacological Action
Pharmacologic Actions
Physiological Effects of Drugs
Protective Agents
Therapeutic Uses processed this record on November 30, 2015