Fenobam on Heat/Capsaicin Induced Hyperalgesia in Healthy Volunteers
Study Details
Study Description
Brief Summary
Our goal is to demonstrate that healthy volunteers treated with fenobam will develop a significantly reduced area of cutaneous hyperalgesia compared to volunteers treated with placebo, after exposure to the heat/capsaicin model of cutaneous sensitization. Additionally we are going to assess changes in mood/affect and cognitive function of subjects following administration of fenobam and after cutaneous sensitization compared to baseline.
Condition or Disease | Intervention/Treatment | Phase |
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Phase 1 |
Detailed Description
All subjects will receive a topical dose of capsaicin cream 0.1%(Capzasin-HP) to the forearm at the start of the study visit. The order of the 2 treatment regimens indicated below will be randomized and blinded to subjects and researchers.
Treatment Regimen 1: Fenobam [1-(3-chlorophenyl)-3-(1-methyl-4-oxo-2-imidazolidinylidine) urea hydrate]: administration of one 150 mg gelatin capsule.
Treatment Regimen 2: Placebo (lactose monohydrate): administration of one 150 mg gelatin capsule.
Study Design
Arms and Interventions
Arm | Intervention/Treatment |
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Experimental: Treatment regimn 1 150 mg Fenobam Orally - once |
Drug: Fenobam
Fenobam 150 mg will be administered and subjects will be monitored for up to 8 hours. During the study day questionnaires will be administered, blood will be drawn a testing site will be marked and pain testing and heat/capsaicin sensitization will be measured.
Other Names:
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Placebo Comparator: Treatment Regimen 2 Placebo orally - once |
Drug: Placebo
A placebo will be administered and subjects will be monitored for up to 8 hours. During the study day questionnaires will be administered, blood will be drawn a testing site will be marked and pain testing and heat/capsaicin sensitization will be measured.
Other Names:
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Outcome Measures
Primary Outcome Measures
- Suppression of the development of cutaneous hyperalgesia and allodynia around the area treated with heat/capsaicin. [During approximately 7 hours of consecutive assessments]
size of the area of hyperalgesia and allodynia around the area sensitized by heat/capsaicin as quantified by cutaneous stimulation with foam brush strokes and a von Frey filament requiring 26 g of bending force.
Secondary Outcome Measures
- Evaluation of nociception after drug administration as evaluated by prolonged (1 min) thermal stimulation on normal (untreated) skin. [During approximately 7 hours of consecutive assessments]
Visual Analog Scale (VAS) rating of pain perception at 1 min 45°C heat stimulation on normal skin.
- Assessment of Heat Pain Detection Thresholds (HPDT) in normal and sensitized skin pre and post treatment with fenobam. [During approximately 7 hours of consecutive assessments]
lowest temperature perceived as painful with stimulation starting at 32°C and with a safety cut-off at 52°C.
- Absence of significant side effects [7 days]
Determined by subjects' monitoring during treatment sessions and follow up at 1 day and 1 week after treatment with drug.
- Assessment of significant change in mood/affect [During approximately 6 hours of consecutive assessments]
As determined by evaluation of the subjects by combined brief Positive And Negative Affect Scale/Brief State Anxiety Measure (PANAS/BSAM)
- Assessment of significant change in cognitive function [During approximately 6 hours of consecutive assessments]
As determined by evaluation of the Letter and Number Sequencing (LNS) assessment
Eligibility Criteria
Criteria
Inclusion Criteria:
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18-50 year old
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Good general health with no remarkable medical conditions (e.g. liver, kidney, heart, or lung failure)
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BMI between 20-33
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Willing to comply with study guidelines as outlined in protocol [including: women of childbearing age must be willing to use a double-barrier method (e.g. oral contraception and condom) for contraception during participation in the study]
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Willing to provide informed consent
Exclusion Criteria:
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Anatomical malformation of upper extremities
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Status post recent trauma or chronic lesions on either forearm
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Medication use (includes vitamin, herbal, dietary and mineral supplements and grapefruit products during or within 14 days prior to study participation; excludes contraceptives)
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History of allergy or intolerance to capsaicin
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History of multiple drug allergies
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History of addiction to drugs or alcohol (prior or present addiction or treatment for addiction)
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History of chronic pain syndromes
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Pregnant and nursing females
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Smokers
Contacts and Locations
Locations
Site | City | State | Country | Postal Code | |
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1 | Washington University School of Medicine | St. Louis | Missouri | United States | 63110 |
Sponsors and Collaborators
- Laura Cavallone
Investigators
- Principal Investigator: Laura F Cavallone, M.D., Washington University School of Medicine
Study Documents (Full-Text)
None provided.More Information
Publications
None provided.- 201311094