A 3- to 5-day Clinical Trial of Levamisole in Loiasis Infected Subjects

NCT ID: NCT06252961

Last Updated: 2024-09-20

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: PHASE2/PHASE3
• Total Enrollment: 99 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2024-06-21
• Study Completion Date: 2026-02-01

Brief Summary

The aim of the study is to evaluate the safety and efficacy of a 3- and 5-day course of levamisole (2.5 mg/kg) in management of loiasis microfilaremia.

Detailed Description

Onchocerciasis and loiasis are parasitic diseases caused by Onchocerca volvulus and Loa loa, respectively.

Onchocerciasis is endemic in 31 African countries, parts of South America, and Yemen, affecting around 37 million people, while loiasis is present in Central Africa, infecting approximately 15 million individuals. Both diseases are associated with severe complications and increased mortality.

African countries have implemented mass drug administration (MDA) programs using ivermectin to combat onchocerciasis. However, co-endemic loiasis poses challenges due to the risk of severe adverse events. Current strategies involve alternative treatments and chemoprophylaxis to accelerate onchocerciasis elimination. The project aims to evaluate the use of levamisole as an alternative treatment.

This project will assess the safety and efficacy of administering levamisole for 3 and 5 days to reduce Loa microfilarial density. Previous research demonstrated the safety of a single dose of levamisole but indicated the need for longer treatment regimens to achieve a significant reduction in Loa microfilarial density. The project aims to test whether 3- and 5-day levamisole regimens induce an acceptable safety profile and a stronger reduction in Loa microfilarial density.

Conditions

Loiasis

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: QUADRUPLE

Study Groups

Levamisole 3 days

Participants randomized in this arm will receive 3 days of levamisole 2.5mg/kg, followed by 2 days of placebo

Group Type: EXPERIMENTAL

Levamisole 3 days

Intervention Type: DRUG

Levamisole for 3 days (2,5 mg/kg) then placebo for 2 days

Levamisole 5 days

Participants randomized in this arm will receive a 5-day course of levamisole 2.5mg/kg

Group Type: EXPERIMENTAL

Levamisole 5 days

Intervention Type: DRUG

Levamisole for 5 days (2,5 mg/kg)

Placebo

Participants randomized in this arm will receive 5 days of placebo

Group Type: PLACEBO_COMPARATOR

Placebo

Intervention Type: DRUG

Placebo for 5 days

Interventions

Levamisole 3 days

Levamisole for 3 days (2,5 mg/kg) then placebo for 2 days

Intervention Type: DRUG

Levamisole 5 days

Levamisole for 5 days (2,5 mg/kg)

Intervention Type: DRUG

Placebo

Placebo for 5 days

Intervention Type: DRUG

Eligibility Criteria

Inclusion Criteria

• Consent informed, written, signed and dated
• Women or men aged 18 to 65 years inclusive
• Carrier of L. loa microfilaremia
• Body weight ≥ 40 kg in women and ≥ 45 kg in men; and less than 90 kg
• In good health, as determined by medical questionnaire and general clinical examination
• Absence of acute or chronic infection :

Exclusion Criteria

• Participation in any study other than a purely observational study, within the 4 weeks preceding this study (determined by the theoretical date of the first administration of levamisole or placebo)
• Any vaccination within 4 weeks previous to this study
• Infection requiring treatment in the 10 days previous to this study, as determined by the anamnesis during the medical interview (e.g. pulmonary infection , digestive or skin infection; with or without antibiotic treatment)
• Treatment with clozapine, phenothiazines, sulfasalazine, carbamazepine, synthetic antithyroid drugs, ticlopidine, cimetidine, and gold salts: whether it was long-term treatment, or treatment given as a single dose 10 days before the start of treatment for the clinical trial (precaution with regard to the risk of agranulocytosis of immuno-allergic or toxic origin)
• Known immunosuppressive pathology (by self-report)
• Past or present history of neurological (including epilepsy) or neuropsychiatric disease
• History of agranulocytosis
• Use of cocaine or other drugs of abuse in the 72 hours preceding administration of the trial treatment, as determined by history during the medical interview
• Any condition, in the opinion of the investigator, that exposes the subject to undue risk
• Known intolerance to levamisole
• Subjects who donated blood in the previous 8 weeks to study entry, with a standard volume (> 500 mL)
• On clinical examination: symptoms, physical signs or laboratory findings suggestive of systemic disorders, including disorders, including renal, hepatic, cardiovascular, pulmonary, skin, immunodeficiency, psychiatric and other abnormalities that could interfere with the interpretation of trial results. The physician may then give a favorable or unfavorable opinion on the participant's inclusion.
• Ivermectin and/or levamisole taken in the last six months; and/or mebendazole or albendazole taken in the last month
• Pregnant and/or breast-feeding women

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 65 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Institut de Recherche pour le Developpement

OTHER_GOV

Sponsor Role: collaborator

Programme National de Lutte contre l'Onchocercose, Republic of the Congo

OTHER_GOV

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Jéremy CAMPILLO, PharmD PhD

Role: STUDY_DIRECTOR

Institut de Recherche pour le Développement (IRD)

François MISSAMOU, MD

Role: PRINCIPAL_INVESTIGATOR

Programme National de Lutte contre l'Onchocercose (PNLO)

Locations

Supervisor

Sibiti, Komono, Republic of the Congo

Site Status: RECRUITING

General Supervisor

Sibiti, Mokassi, Republic of the Congo

Site Status: RECRUITING

Countries

Republic of the Congo

Central Contacts

Jéremy CAMPILLO, PharmD PhD

Role: CONTACT

jeremy.campillo@ird.fr

+33 4 67 41 61 52

Bachiratou SAHM

Role: CONTACT

bachiratou.sahm@ird.fr

Facility Contacts

Marlhand HEMILEMBOLO

Role: primary

+242 69781411

François MISSAMOU

Role: primary

+242 66680563

References

Chesnais CB, Hemilembolo MC, Sahm BA, Toutin F, Djeutassong E, Nga-Elomo N, Cuer B, Ntsiba-N'Goulou MA, Pakat M, Pion SDS, Missamou F, Boussinesq M, Campillo JT. Safety and efficacy of 3- and 5-day regimens of levamisole in loiasis: a randomized, placebo-controlled, double-blind clinical trial. Nat Commun. 2025 Jul 4;16(1):6191. doi: 10.1038/s41467-025-61479-6.

Reference Type: DERIVED

PMID: 40615414 (View on PubMed)

Other Identifiers

Protocole128

Identifier Type: -

Identifier Source: org_study_id