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Trichostatin A

Phase 2

Onychomycosis of Toenail | Small molecule | Dermatology |Vanda Pharmaceuticals Inc.|Trials Updated: Mar 16, 2026

Trichostatin A development status

Highest phase Phase 2
Registered trials 2 across 1 sponsor since Feb 2019

Trichostatin A target and mechanism

Molecular targetHDAC
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials2
Total Enrollment92

FDA Designations

No designations recorded

Trichostatin A clinical trials

Trichostatin A · 2 trials · 2 indications

Phase 2 1Phase 1 1
NCT07065773Safety, Tolerability and Efficacy of Trichostatin A in Patients With Mild to Severe OnychomycosisOnychomycosis of Toenail
ACTIVE NOT_RECRUITING50 Analytics
PHASE2ACTIVE NOT_RECRUITING
Safety, Tolerability and Efficacy of Trichostatin A in Patients With Mild to Severe Onychomycosis
Onychomycosis of ToenailUnlock trial analytics

Study Endpoints

Primary Endpoints

Safety and Tolerability
24 weeks

Subjects will be asked about AEs weekly during the evaluation phase and at every follow-up visit; descriptions of AEs will include, at a minimum: date of onset, date ended, severity, seriousness, relationship to the study drug, and outcome.

Safety and tolerability of trichostatin A measured by spontaneous reporting of adverse events (AEs)
Up to 24 months

Measured by spontaneous reporting of adverse events (AEs)

Dose-limiting toxicities (DLTs) and maximum tolerated dose (MTD) of trichostatin A
Up to 24 months
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Trichostatin AEXPERIMENTAL -

Interventions

NameTypeDescription
Trichostatin ADRUGTopical Study Drug
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites5

Inclusion Criteria: * Willingness to provide signed and dated written voluntary informed consent. * Adults with diagnosis of mild-to-severe DLSO/DSO affecting at least one great toenail. * Positive microscopic examination with KOH for dermatophyte hyphae. * Positive dermatophyte culture or mixed de...

Countries:United StatesPoland
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Frequently asked questions about Trichostatin A

What is Trichostatin A used for?

Trichostatin A is an investigational small molecule being studied for onychomycosis of the toenail and for relapsed or refractory hematologic malignancies. It is in Phase 2 clinical development for onychomycosis and Phase 1 for hematologic malignancies.

What does Trichostatin A target?

Trichostatin A targets HDAC, or histone deacetylase. It is a small molecule being developed by Vanda Pharmaceuticals Inc. for potential use in dermatology and oncology indications.

Who makes Trichostatin A?

Vanda Pharmaceuticals Inc. (NASDAQ: VNDA) is developing Trichostatin A. The company is conducting clinical trials of the drug for onychomycosis of the toenail and for relapsed or refractory hematologic malignancies.

What phase is Trichostatin A in?

Trichostatin A is in Phase 2 clinical development for onychomycosis of the toenail, based on an active Phase 2 trial. It is also being studied in a Phase 1 trial for relapsed or refractory hematologic malignancies.

What clinical trials is Trichostatin A in?

Trichostatin A is being studied in NCT07065773, a Phase 2 trial for onychomycosis of the toenail with 50 participants in the United States. It is also in NCT03838926, a Phase 1 trial for relapsed or refractory hematologic malignancies with 42 participants in the United States and Poland.

Is Trichostatin A FDA approved?

Trichostatin A is not FDA approved. It is an investigational drug still in clinical development, with active trials in Phase 1 and Phase 2 for different indications.