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Pharmacokinetic and Pharmacodynamic Interaction Study of Digoxin and Hawthorn

This study has been completed.
Information provided by:
National Center for Research Resources (NCRR) Identifier:
First received: October 4, 2000
Last updated: June 23, 2005
Last verified: November 2001
Hawthorn (Crataegus oxyacantha) is a natural product that is popular in European and American herbal medicine practice. Some of its cardiac uses include the treatment of high and low blood pressure, rapid heart beat, chest pain, and blocked arteries. In many cases, it is used as an adjuvant agent with other cardiac drugs such as digoxin, amiodarone, and warfarin. To date, little information is known about the effect of hawthorn when taken with other drugs and if toxicities occur when hawthorn is used with other drugs. The purpose of this study is to examine the interaction between digoxin and hawthorn in eight healthy subjects. Subjects will be recruited by advertisement. The design of the study will include a 10-day and a three-week treatment phase of digoxin 0.125 mg - 0.25 mg/day and hawthorn (Crataegus special extract WS1442, Schwabe Co.) 450 mg twice daily or placebo, with a randomized crossover. There will be a three-week washout period in between treatment phases. On day 10 (phase I) and day 21 (phase II), subjects will have 12 blood samples drawn for pharmacokinetic analysis. The plasma samples will be measured for digoxin concentration. Additionally, the subjects will be assessed for any clinical toxicities or adverse events. The significance of this study is to provide the clinician with information regarding the safe use of digoxin in combination with the herbal supplement, hawthorn.

Condition Intervention
Heart Diseases Drug: Digoxin Drug: Hawthorn

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)
Primary Purpose: Treatment

Resource links provided by NLM:

Further study details as provided by National Center for Research Resources (NCRR):


Ages Eligible for Study:   18 Years to 55 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy adult
  • Not regularly taking any prescription or non-prescription medications (including natural products or supplements) and is willing to avoid all medications other than the study drugs during the study period.
  • Willing to avoid drinking any alcohol throughout the study period.
  • Does not currently smoke and is willing to avoid smoking during the study period.
  • Willing to adhere to dietary restrictions as required during the study.
  Contacts and Locations
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Please refer to this study by its identifier: NCT00006330

United States, Michigan
Univ. of Michigan Medical Center
Ann Arbor, Michigan, United States, 48109-0008
Sponsors and Collaborators
National Center for Research Resources (NCRR)
  More Information Identifier: NCT00006330     History of Changes
Other Study ID Numbers: NCRR-M01RR00042-1693
M01RR000042 ( U.S. NIH Grant/Contract )
Study First Received: October 4, 2000
Last Updated: June 23, 2005

Keywords provided by National Center for Research Resources (NCRR):
Effect modifiers (Epidemiology)
Drug Interaction

Additional relevant MeSH terms:
Heart Diseases
Cardiovascular Diseases
Anti-Arrhythmia Agents
Cardiotonic Agents
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Protective Agents
Physiological Effects of Drugs processed this record on September 19, 2017