Antipruritic Effect of Topical Ketamine, Amitriptyline, and Lidocaine

NCT ID: NCT03096444

Last Updated: 2019-07-02

Study Results

Results available

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Basic Information

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Recruitment Status

TERMINATED

Clinical Phase

PHASE2

Total Enrollment

13 participants

Study Classification

INTERVENTIONAL

Study Start Date

2017-05-23

Study Completion Date

2017-07-21

Brief Summary

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The purpose of this study is to examine the antipruritic efficacy of topical ketamine, amitriptyline, lidocaine, and a tri-combination of ketamine, amitriptyline and lidocaine (hereafter referred to as "KeAmLi") using non-histaminergic itch provocations in healthy volunteers. The primary outcome is itch reduction (AUC) between the vehicle and active treatment (KeAmLi-combo). Secondary outcomes include modality-specific analgesic properties of the topically applied ketamine, amitriptyline, lidocaine, and KeAmLi-combo to controlled quantitative thermal and mechanical stimuli, which can improve our understanding of the mechanism of action of these substances in the context of topical therapy.

Detailed Description

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This is a double-blind, vehicle-controlled study to evaluate the antipruritic efficacy of topical ketamine, amitriptyline, lidocaine, and a tri-combination of ketamine, amitriptyline and lidocaine (hereafter referred to as "KeAmLi") using non-histaminergic itch provocations in healthy volunteers. Each participant will be pre-treated with the vehicle and 4 active topical creams, over two study visits (3 treatments on the 1st visit and 2 treatment on the 2nd visit). Each treatment will be applied to the randomized forearm test area for 30 minute, and then sensory testing will be performed. Sensory testing includes thermal and mechanical stimuli, and itch induction using the plant cowhage. These tests will reveal mechanistic information and potential cellular and molecular targets for improved antipruritic and analgesic therapies.

Conditions

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Pruritus

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

The antipruritic effect of 4 topical treatments and 1 vehicle treatment will be explored in each subject. Study visit 1 will consist of testing 3 topical formulations, and study visit 2 will test the remaining 2 topical formulations in each subject.
Primary Study Purpose

TREATMENT

Blinding Strategy

DOUBLE

Participants Investigators

Study Groups

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Topical KeAmLi combo

Topical KeAmLi-combo (ketamine 10%, amitriptyline 5%, and lidocaine 5%) will be applied to one four 4 x 4 cm predefined skin areas on the ventral forearms during one of two study visits. The pre-treatment will occur under topical occlusion for 30 minutes to allow the ointment to be adsorbed. Following this, residual ointment will be removed and sensory testing, strictly within the pretreated area, will commence.

Group Type EXPERIMENTAL

Ketamine hydrochloride, Amitriptyline hydrochloride, and Lidocaine hydrochloride

Intervention Type COMBINATION_PRODUCT

2g of topical KeAmLi-combo (ketamine 10%, amitriptyline 5%, and lidocaine 5%) will be applied for 30 minutes on one 4x4cm area on the volar forearm in one of two study visits.

Topical ketamine

Topical ketamine 10% will be applied to one four 4 x 4 cm predefined skin areas on the ventral forearms during one of two study visits. The pre-treatment will occur under topical occlusion for 30 minutes to allow the ointment to be adsorbed. Following this, residual ointment will be removed and sensory testing, strictly within the pretreated area, will commence.

Group Type EXPERIMENTAL

Ketamine Hydrochloride

Intervention Type DRUG

2g of topical 10% Ketamine will be applied for 30 minutes on one 4x4cm area on the volar forearm in one of two study visits.

Topical amitriptyline

Topical amitriptyline 5% will be applied to one four 4 x 4 cm predefined skin areas on the ventral forearms during one of two study visits. The pre-treatment will occur under topical occlusion for 30 minutes to allow the ointment to be adsorbed. Following this, residual ointment will be removed and sensory testing, strictly within the pretreated area, will commence.

Group Type EXPERIMENTAL

Amitriptyline Hydrochloride

Intervention Type DRUG

2g of topical 5% Amitriptyline will be applied for 30 minutes on one 4x4cm area on the volar forearm in one of two study visits.

Topical lidocaine

Topical lidocaine 5% will be applied to one four 4 x 4 cm predefined skin areas on the ventral forearms during one of two study visits. The pre-treatment will occur under topical occlusion for 30 minutes to allow the ointment to be adsorbed. Following this, residual ointment will be removed and sensory testing, strictly within the pretreated area, will commence.

Group Type EXPERIMENTAL

Lidocaine Hydrochloride

Intervention Type DRUG

2g of topical 5% Lidocaine will be applied for 30 minutes on one 4x4cm area on the volar forearm in one of two study visits.

Topical vehicle

Topical vehicle (PCCA Lipoderm) will be applied to one four 4 x 4 cm predefined skin areas on the ventral forearms during one of two study visits. The pre-treatment will occur under topical occlusion for 30 minutes to allow the ointment to be adsorbed. Following this, residual ointment will be removed and sensory testing, strictly within the pretreated area, will commence.

Group Type PLACEBO_COMPARATOR

Lipoderm Cream

Intervention Type DRUG

2g of topical vehicle (Lipoderm) will be applied for 30 minutes on one 4x4cm area on the volar forearm in one of two study visits.

Interventions

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Ketamine Hydrochloride

2g of topical 10% Ketamine will be applied for 30 minutes on one 4x4cm area on the volar forearm in one of two study visits.

Intervention Type DRUG

Amitriptyline Hydrochloride

2g of topical 5% Amitriptyline will be applied for 30 minutes on one 4x4cm area on the volar forearm in one of two study visits.

Intervention Type DRUG

Lidocaine Hydrochloride

2g of topical 5% Lidocaine will be applied for 30 minutes on one 4x4cm area on the volar forearm in one of two study visits.

Intervention Type DRUG

Ketamine hydrochloride, Amitriptyline hydrochloride, and Lidocaine hydrochloride

2g of topical KeAmLi-combo (ketamine 10%, amitriptyline 5%, and lidocaine 5%) will be applied for 30 minutes on one 4x4cm area on the volar forearm in one of two study visits.

Intervention Type COMBINATION_PRODUCT

Lipoderm Cream

2g of topical vehicle (Lipoderm) will be applied for 30 minutes on one 4x4cm area on the volar forearm in one of two study visits.

Intervention Type DRUG

Other Intervention Names

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Topical ketamine Topical amitriptyline Topical lidocaine Topical KeAmLi combo Topical vehicle

Eligibility Criteria

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Inclusion Criteria

1. Healthy subjects (absence of disease) between 18 and 50 years of age.
2. Must be in general good health with no disease or physical conditions that would impair evaluation of itch and pain perception.
3. No history of chronic itch or pain.
4. Must abstain from the use of any systemic or topical anti-histamine, steroid, or pain relief medications 48 hours prior to the study visits.
5. Must abstain from the use of moisturizers on the arms the day of study visit.

Exclusion Criteria

1. Individuals under 18 or over 50 years of age.
2. Inability to complete the required measures.
3. The presence of an itchy skin disease or a painful condition.
4. Diagnosis of diseased that would affect itch or pain perception (e.g. neuropathies).
5. Currently enrolled in any investigational study in which the subject is receiving any type of drug, biological, or non-drug therapy.
6. Use of oral, topical analgesics, or other medications known to interfere with itch or pain perception 48 hours prior to the study visits (e.g. antihistamines, anesthetics, anti-inflammatories, opioids, neuroleptics, etc.).
7. Use of emollients on the volar aspects of the forearms arms on the day of the study visit.
8. Use of anti-depressants, anti-psychotics, and illicit drugs.
9. Known history of neuropathy, uremia, uncontrolled thyroid disease, and diabetes mellitus.
10. Known history of anaphylactic shock, or allergy to cowhage and/or known adverse reactions to lidocaine (or other local anesthetics of the amide type), ketamine or amitriptyline.
Minimum Eligible Age

18 Years

Maximum Eligible Age

50 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes

Sponsors

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Gil Yosipovitch

OTHER

Sponsor Role lead

Responsible Party

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Gil Yosipovitch

Professor

Responsibility Role SPONSOR_INVESTIGATOR

Principal Investigators

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Gil Yosipovitch, MD

Role: PRINCIPAL_INVESTIGATOR

University of Miami

Locations

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University of Miami

Miami, Florida, United States

Site Status

Countries

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United States

References

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Provided Documents

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Document Type: Study Protocol and Statistical Analysis Plan

View Document

Other Identifiers

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20170087

Identifier Type: -

Identifier Source: org_study_id

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