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Study of LHP588 in Subjects With P. Gingivalis-Positive Alzheimer's Disease

NCT06847321 · Status: RECRUITING · Phase: PHASE2 · Type: INTERVENTIONAL · Enrollment: 300

Last updated 2026-05-18

No results posted yet for this study

Summary

This study is to test LHP588 in persons who have mild to moderate Alzheimer's disease (AD) who have shown progressive mental decline in the last year and who have P. gingivalis (Pg) infection. P. gingivalis infection has been linked to the development of dementia. LHP588 is designed to target the P. gingivalis bacterium, to potentially help to halt or slow down the progression of AD and its symptoms. A saliva test will be done to determine P. gingivalis infection. Tests for AD include standard questionnaires such as MMSE and a blood test for pTau 217. Treatment will be blinded, meaning the participant and the doctor will not know if the participant is receiving LHP588 or placebo. The total time for participation in the study may be up to 64 weeks. This includes a screening period (to ensure the participant is suitable for the study and the study is suitable for the participant) of up to 12 weeks, a treatment period of up to 48 weeks, and a safety follow-up period of 4 weeks after the last dose of the study drug to check the participant's overall health. Treatment is a once-a-day capsule. Caregiver participation is required. The study requires the participant to visit the study center (with the caregiver) at least 20 times within 64 weeks (this does not include any unplanned visits that may be recommended by the study doctor). In addition, the study doctor or clinic staff will contact the participant via phone at least 1 time.

Conditions

Interventions

DRUG

LHP588

25 mg, once dialy

DRUG

LHP588

50 mg, once daily

DRUG

Placebo Drug

Placebo, once daily

Sponsors & Collaborators

  • Lighthouse Pharmaceuticals, Inc.

    lead INDUSTRY

Principal Investigators

  • Stephen Dominy, MD · Lighthouse Pharmaceuticals, Inc.

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Model
PARALLEL

Eligibility

Min Age
55 Years
Max Age
80 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2025-02-17
Primary Completion
2028-09-30
Completion
2028-12-31
FDA Drug
Yes

Countries

  • United States

Study Locations

More Related Trials

Entities

Diseases

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT06847321 on ClinicalTrials.gov