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This is an open-label, radiotracer study, to be conducted in healthy, normal, male volunteers. It will entail intravenous administration of a single dose of 14C-MNTX, collection of excretions, and periodic drawing of blood samples. Exhaled 14CO2 will also be sampled as a measure of the extent of possible metabolic MNTX demethylation.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Arm1 | Experimental | MNTX active treatment |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| IV methylnaltrexone (MNTX) | Drug |
|
| Measure | Description | Time Frame |
|---|---|---|
| Peak Plasma and Whole Blood Concentration (Cmax) of IV MNTX | To study the pharmacokinetics of MNTX following a single IV dose of 14C-MNTX in normal, healthy volunteers. | 5.5 days |
| Measure | Description | Time Frame |
|---|---|---|
| Time to Maximum (Tmax) in Plasma and Whole Blood Concentration of IV MNTX | To study the pharmacokinetics of MNTX following a single IV dose of 14C-MNTX in normal, healthy volunteers. | 5.5 Days |
| Clearance of IV MNTX |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Tage Ramakrishna, MD | Progenics Pharmaceuticals, Inc. | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Progenics Pharmaceuticals, Inc. | Tarrytown | New York | 10591 | United States |
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| ID | Term |
|---|---|
| C032257 | methylnaltrexone |
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To study the pharmacokinetics of MNTX following a single IV dose of 14C-MNTX in normal, healthy volunteers.
| 5.5 days |
| Half-life of IV MNTX | To study the pharmacokinetics of MNTX following a single IV dose of 14C-MNTX in normal, healthy volunteers. | 5.5 days |
| Volume of Distribution of IV MNTX | To study the pharmacokinetics of MNTX following a single IV dose of 14C-MNTX in normal, healthy volunteers. | 5.5 days |
| Urinary Clearance of IV MNTX | To study the pharmacokinetics of MNTX following a single IV dose of 14C-MNTX in normal, healthy volunteers. | 5.5 days |