L-5-HTP-Related EMS

Completed

Conditions studied: Eosinophilia-Myalgia Syndrome

In brief

In 1989 more than 1500 people who took the dietary supplement L-tryptophan for insomnia and depression developed eosinophilia myalgia syndrome (EMS)-a potentially fatal disease characterized by an excess of a type of white blood cell called eosinophils. Disease symptoms include fever, muscle aches and inflammation, and skin rashes. As many as 40 of the patients who became ill died. It is suspected that impurities in the supplements caused the disease. More recently, similar impurities have been detected in batches of a similar dietary supplement called L-5-hydroxytryptophan. This study is designed to learn more about EMS that develops in patients taking L-5-hydroxytryptophan. The study is open to patients newly diagnosed with eosinophilia myalgia who have taken L-5-HTP. Patients in the study will have a physical examination and urine and blood tests. They may also have X rays, an electrocardiogram, magnetic resonance imaging (MRI), and a skin test for tuberculosis. They will have a psychiatric interview, take a memory test, and fill out questionnaires relating to sadness and depression. Patients may also undergo special tests to study conduction of nerve impulses and muscle function. Samples of patients' supplements will be taken for chemical analysis.

Key facts

Study ID
NCT00001918
Run by
National Institute of Mental Health (NIMH)
People needed
20
Starts
1999-07-01
Expected to finish
2000-08-01
Last updated by the study team
2008-03-04

Who can join

Age: any. Sex: any. Healthy volunteers: not accepted.

Where it is running

Full record on ClinicalTrials.gov

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