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The purpose of this study is to determine whether three Echinacea preparations with different chemical compositions are effective for prevention or treatment of the common cold.
Echinacea is a widely used herbal remedy for the common cold. Previous clinical trials designed to assess the efficacy of Echinacea for prevention or treatment of the common cold have produced inconsistent results. A variety of different Echinacea products have been used in these clinical trials. Recent studies indicate that different Echinacea preparations have dramatically different phytochemical profiles. The available clinical trial data provide no information about the potential role of the different constituents of Echinacea in common cold prevention or treatment. Our hypothesis is that the variation in reported clinical effectiveness may be due to differences in the phytochemical profile of the Echinacea preparations used. This study will address the following specific aims: 1) Evaluate the effectiveness of chemically defined extracts of E. angustifolia root which contain alkamides, echinacoside or polysaccharidelglycoprotein for common cold prevention or treatment; 2) Assess the correlation between specific Echinacea metabolites in serum and nasal secretions and efficacy for prevention and treatment of colds; and 3) Determine the effect of different Echinacea preparations on the host response to rhinovirus infection.
Allocation: Randomized, Control: Placebo Control, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double-Blind, Primary Purpose: Prevention
University of Virginia, Charlottesville
National Center for Complementary and Alternative Medicine (NCCAM)
Published on BioPortfolio: 2014-07-23T21:55:07-0400
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A broad category of multi-ingredient preparations that are marketed for the relief of upper respiratory symptoms resulting from the COMMON COLD; ALLERGIES; or HUMAN INFLUENZA. While the majority of these medications are available as OVER-THE-COUNTER DRUGS some of them contain ingredients that require them to be sold as PRESCRIPTION DRUGS or as BEHIND-THE COUNTER DRUGS.
A genus of PICORNAVIRIDAE inhabiting primarily the respiratory tract of mammalian hosts. It includes over 100 human serotypes associated with the COMMON COLD.
A catarrhal disorder of the upper respiratory tract, which may be viral or a mixed infection. It generally involves a runny nose, nasal congestion, and sneezing.
A genus of perennial herbs used topically and internally. It contains echinacoside, GLYCOSIDES; INULIN; isobutyl amides, resin, and SESQUITERPENES.
A constellation of responses that occur when an organism is exposed to excessive cold. In humans, a fall in skin temperature triggers gasping, hypertension, and hyperventilation.
In a clinical trial or interventional study, participants receive specific interventions according to the research plan or protocol created by the investigators. These interventions may be medical products, such as drugs or devices; procedures; or change...
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