Last updated on June 2020

Rifaximin in Patients With Monoclonal Gammopathy

Brief description of study

This trial studies how well rifaximin works in treating patients with monoclonal gammopathy. Antibiotics, such as rifaximin, may help to kill bacteria in the intestines and reduce the abnormal protein or cells in patients with monoclonal gammopathy.

Detailed Study Description


I. To evaluate the effect of a 2-week course of rifaximin on clonal immunoglobulin (Ig) in patients with monoclonal gammopathy.


I. To evaluate safety and tolerability of a 2-week course of rifaximin.

II. To evaluate changes in stool microbiota by 16S ribosomal ribonucleic acid (rRNA) gene (16S) sequencing.

III. To evaluate changes in gammopathy as assessed by changes in clonal Ig and/or plasma cells.


Patients receive rifaximin orally (PO) thrice daily (TID) on days 1-14 in the absence of disease progression or unacceptable toxicity.

After completion of study treatment, patients are followed for 8 weeks.

Clinical Study Identifier: NCT03820817

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Recruitment Status: Open

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