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The primary objective of this study is to determine if rifaximin, administered daily has an effect on the cytochrome P450 (CYP) isoenzyme 3A4, by examining any changes in the pharmacokinetics of midazolam (a CYP3A4 substrate), when co-administered.
This is a single-site, single-arm, open-label, drug-interaction study that examines the effect of rifaximin (RFX), 550 mg 3 times daily (TID; 1650 mg/day), on orally administered (PO) midazolam (MDZ) 2 mg (administered as a 2 mg dose in 1 mL of midazolam HCL Syrup; 2 mg/mL) when dosed for 7 and 14 consecutive days, respectively.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| 1 | Experimental | open-label rifaximin 550 mg TID |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| rifaximin | Drug | 550 mg TID |
|
| Measure | Description | Time Frame |
|---|---|---|
| Individual midazolam and rifaximin plasma concentrations and pharmacokinetic parameters will be summarized. | 21 to 38 days (including a 21 day screening period) |
| Measure | Description | Time Frame |
|---|---|---|
| Overall safety assessments will include the incidence, intensity, and type of adverse events, and clinically significant changes in the patient's physical examination, vital signs and laboratory results. | 21 tyo 38 days |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| William Lewis, MD | Covance CRU, Inc | Principal Investigator |
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| ID | Term |
|---|---|
| D000078262 | Rifaximin |
| ID | Term |
|---|---|
| D012294 | Rifamycins |
| D006576 | Heterocyclic Compounds, 4 or More Rings |
| D000072471 | Heterocyclic Compounds, Fused-Ring |
| D006571 | Heterocyclic Compounds |
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| D047029 | Lactams, Macrocyclic |
| D047028 | Macrocyclic Compounds |
| D011083 | Polycyclic Compounds |