Arnica Tincture Fot the Treatment of Cutaneous Leishmaniasis (ARNICA)

February 6, 2025 updated by: Universidad de Antioquia

Randomized Clinical Trial to Evaluate the Safety and Therapeutic Response of Two ARNICA TINCTURE Treatment Regimes in the Topical Treatment of Uncomplicated Cutaneous Leishmaniasis in Colombia

Cutaneous Leishmaniasis (CL) is a parasitic disease caused by more than 20 different species of the protozoan parasite Leishmania. CL generally begins with a papule at the sand fly bite site, increasing to form a nodule that progresses to ulceration, or a scaly or wart-like plaque, over a period of 1 to 3 months.

The exact incidence of CL is not known. An estimated 1.2 million cases / year in approximately 100 countries around the world suffer from different forms of CL. In general, most lesions become ulcerated during the course of the disease. Among the different species of the parasite that cause LC, L. tropica from the Old World and L. braziliensis from the New World are considered the most important due to the severity of the disease they produce and because they are more difficult to cure with medications currently available.

Since 2010, the World Health Organization has insisted on the need to work on products that become alternatives for the treatment of CL, especially in products that serve topical application because with them, the probability of systemic toxicity is lower , increasing patient safety.

Among the options for topical treatment are natural products that have been, are, and will be extremely important as sources of medicinal agents. In addition to natural products that have found direct medicinal application as pharmaceutical entities, many others can serve as chemical models or templates for the design, synthesis and semi-synthesis of novel substances for the treatment of human diseases.

Arnica montana L. is a plant with anti-echemotic, healing, anti-inflammatory, analgesic and antineuralgic properties; It is included in the Colombian vademecum of medicinal plants. In previous studies it has been observed that the contact of the ulcerated skin with the product for up to 60 days does not generate toxic effects at the local level (application site) or at the systemic level, so it can be considered safe for use. To date there are no human studies with CL.

Therefore, it is intended to evaluate the safety and tolerability of Arnica tincture in individuals with uncomplicated CL, by measuring the occurrence and severity analysis of local and systemic adverse events.

Study Overview

Status

Active, not recruiting

Conditions

Intervention / Treatment

Detailed Description

Arnica tincture is a topical preparation based on the plant legally authorized in the countries of the European community, and it is included in the vademecun of medicinal plants in Colombia. The research product is the commercial phytotherapeutic product ARNICA TINTURA Gehrlicher 100 mL manufactured by Gehrlicher Pharmazeutische Extrakte GmbH. (www. https://www.wer-zu-wem.de/firma/gehrlicher-extrakte.html). The product will be imported from Germany through the University of Munster (project co-investigator).

According to the European Pharmacopoeia, the solution is a 70% hydroethanolic tincture prepared from the flowers of Arnica montana L, and composed at least 0.04% of sesquiterpene lactones. Sesquiterpenic lactones (helenalin and 11-α-13 dihydrohelenaline) are the constituents responsible for its anti-inflammatory activity, these molecules decrease inflammation mediated by the transcription factor NF-kB. There are other properties demonstrated in the literature such as antioxidant, antimicrobial or insecticidal activities.

Given the plant's anti-inflammatory, healing, anti-echemotic, analgesic and antineuralgic properties, in a previous study the leishmanicidal activity of arnica tincture was evaluated in vitro for intracellular amastigotes of L. braziliensis and L. tropica. Arnica tincture at a concentration of 4.8 mg / mL produced a decrease in the parasite load (amount of intracellular amastigotes) of 91.9% and 99.6% in cells infected by L. braziliensis and L. tropica, respectively. . The mean maximum Effective Concentrations (EC50) were determined at 2.9 ± 0.13 and 2.7 ± 0.02 respectively, and with selectivity indices> 69 and> 74, for L. braziliensis and L. tropica, respectively. This activity was validated in in vivo studies in hamsters experimentally infected with L. braziliensis. Applying the tincture once a day for 30 days produced a cure of 60 and for the remaining 40% of the hamsters a reduction of more than 80% of the lesions was observed (Robledo et al., 2018). When applied once a day for 60 days, 75% of the hamsters were cured and the remaining 25% showed improvements between 70 and 96% regarding the size of the lesion before treatment. According to the observations made, it is part of the natural evolution of the healing process that, during the first weeks of use of the compound and until the end of the treatment, a flattening of the edges is perceived, with intensification of the erythema, which produces a Optical sensation of enlargement of the lesion, which subsequently (from day 28) gives rise to the re-epithelialization process, which is slightly slower compared to traditional systemic schemes. The percentage of epithelialization of the lesion (s) is calculated by comparing the size of the ulcer at baseline against the size observed at the follow-up visit.

Arnica tincture is not cytotoxic on epithelial cells (Detroit) at any concentrations tested. In liver cells (HepG2) the tincture showed a slight cytotoxicity when evaluated at 100%, with a toxicity percentage of 75%. Weight, clinical appearance, and behavior data, as well as ALT, alkaline phosphatase, creatinine, and urea test results; and the histological studies obtained from the tests in hamsters allowed to conclude that the contact of the ulcerated skin with the product for up to 60 days does not generate toxic effects at the local level (application site) or at the systemic level, so it can be considered as safe for use. Corrosion and irritation tests to evaluate arnica skin tincture according to OECD guidelines suggest that it is neither corrosive nor irritating.

Although it is difficult to calculate accurately, it has been estimated that approximately 2 drops (80uL) of the solution will be used per cm2 in each application. If we consider an average lesion size of 4 cm2, a maximum of 320 uL is used X 3 times a day X 45 or 30 days = 43,200 uL or 28,800uL (equivalent to 43.2 or 28.8 mL) per lesion.

  1. Main Objectives

    • Evaluate the safety and tolerability of Arnica tincture in individuals with uncomplicated CL, by measuring the occurrence and severity analysis of local and systemic ADs.
    • Evaluate the therapeutic response of Arnica tincture in individuals with uncomplicated CL, according to the percentage of individuals with initial clinical cure on day 90.

    Regimen 1: Arnica tincture applied 3 times a day for 30 days (Group 1: 4 weeks) Regimen 2: Arnica tincture applied 3 times a day for 45 days (Group 2: 6 weeks)

  2. Secondary Objectives

    • Evaluate the frequency and severity of AEs associated with the use of the Arnica tincture solution.
    • Assess the status of the lesions over time, up to 100% epithelialization of ulcerated lesions and proportion of individuals with 100% epithelialization of non-ulcerated lesions over time.
    • Assess the relapse rate.

Study Type

Interventional

Enrollment (Estimated)

16

Phase

  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Colombia
    • Antioquia
      • Medellín, Antioquia, Colombia, 0004
        • Program for Research and Control in Tropical Diseases - PECET

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 65 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Men or women, of legal age, between 18 and 65 years old.
  • With a confirmed parasitological diagnosis of CL in at least one lesion, performed at least through the following methods: 1) microscopic identification of amastigotes in the lesion tissue; 2) diagnosis of leishmania through PCR; 3) positive culture for promastigotes.

  • Subjects with an injury that meets the following criteria:

    • Ulcer or nodule with a maximum size of 4 cm (the largest diameter).
    • Not located in the ear, face, near mucous membranes, joints, or in places where, in the opinion of the IP, the administration of the product is difficult to apply topically.
  • Subjects with a maximum of 4 LC lesions.
  • Injury with an evolution of less than 4 months according to the subject's history.
  • Subjects who have given their CI in writing.
  • At the discretion of the IP, the subject is able to understand and comply with the requirements of the study.
  • Subjects who can attend control visits.

Exclusion Criteria:

  • Women with a positive pregnancy test during the screening process, or breastfeeding, or women of childbearing potential who do not accept the use of contraceptives during treatment and up to 45 days after treatment.
  • History of clinically significant medical problems or treatments that may interact negatively or positively with topical treatment for Leishmaniasis, including any immunocompromising conditions.
  • Within 8 weeks (56 days) of starting the study treatment, having received treatment for Leishmaniasis with any type of medication, including Glucantime that probably, in the opinion of the PI, could modify the course of infection with Leishmania.
  • Based on physical examinations performed, a diagnosis of CML has been or is suspected.
  • Known or suspected history of hypersensitivity or idiosyncratic reactions to study treatment.

  • Present the following laboratory alterations:

    • Serum creatinine above normal levels
    • ALT / AST levels 3 times above the normal value (according to the levels reported by the local laboratory).
  • Subjects who do not want to keep study appointments or who cannot keep follow-up visits for up to six months.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Regime 1 (30 days)
Regimen 1: arnica tincture applied 3 times a day for 30 days (group 1). For both regimens, the participant applies the tincture in the morning, afternoon and evening, that is, three times a day.
Drug: Arnica Tincture
Arnika tincture is a topical plant-based preparation legally authorized in Colombia and in the countries of the European community, the product of this study is Arnika tinktur Gehrlicher (5249), manufactured by Gehrlicher Pharmazeutische Extrakte GmbH, Germany. According to the European Pharmacopoeia, the solution is a 70% hydroethanolic tincture prepared from the flowers of A. montana L, and composed at least 0.04% of sesquiterpene lactones. Arnica tincture will be applied topically by each participant on all lesions until day 30 or 45, depending on the regimen to be evaluated.
Other Names:
  • topical solution
Active Comparator: Regime 2 (45 days)
Regimen 2 arnica tincture applied 3 times a day for 45 days (group 2). For both regimens, the participant applies the tincture in the morning, afternoon and evening, that is, three times a day.
Drug: Arnica Tincture
Arnika tincture is a topical plant-based preparation legally authorized in Colombia and in the countries of the European community, the product of this study is Arnika tinktur Gehrlicher (5249), manufactured by Gehrlicher Pharmazeutische Extrakte GmbH, Germany. According to the European Pharmacopoeia, the solution is a 70% hydroethanolic tincture prepared from the flowers of A. montana L, and composed at least 0.04% of sesquiterpene lactones. Arnica tincture will be applied topically by each participant on all lesions until day 30 or 45, depending on the regimen to be evaluated.
Other Names:
  • topical solution

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Number of participants with Initial post-treatment healing
Time Frame: day 90
defined as 100% epithelialization of the lesion (s) by day 90 post-treatment.
day 90

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Number of participants with Final post-treatment Healing
Time Frame: day 180
initial healing without relapse and / or mucosal compromise at the 180th day post-treatment evaluation
day 180
Number of participants with lesions that relapse
Time Frame: day 180
lesion that achieves 100% epithelialization by Day 90 post-treatment and then returned to show activity by day 180 post-treatment.
day 180

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Universidad de Antioquia

Collaborators

INNOVATION CORPORATION FOR THE DEVELOPMENT OF PRODUCTS FOR TROPICAL DISEASES (CIDEPRO)

Investigators

  • Principal Investigator: Ivan D Velez, PhD, Director PECET

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

May 3, 2023

Primary Completion (Actual)

November 2, 2024

Study Completion (Estimated)

August 1, 2025

Study Registration Dates

First Submitted

September 28, 2021

First Submitted That Met QC Criteria

October 15, 2021

First Posted (Actual)

October 26, 2021

Study Record Updates

Last Update Posted (Actual)

March 25, 2025

Last Update Submitted That Met QC Criteria

February 6, 2025

Last Verified

February 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • PEC02_2021

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Clinical Trials on Leishmaniasis, Cutaneous

Clinical Trials on Arnica Tincture

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Austria

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

Subscribe