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Part B & Part D: Phase I Single and Multiple-Ascending Dose Trial of SPT-320 in Healthy Participants

Part B & Part D: Phase 1, Double-Blind, Placebo-Controlled, 4-Part, Single- and Multiple-Ascending Dose Trial to Assess the Safety, Tolerability, Pharmacokinetics, and Preliminary Pharmacodynamics of SPT-320 in Healthy Participants.

Status
Completed
Phases
Phase 1
Study type
Interventional
Source
ANZCTR
Registry ID
ACTRN12625000685415
Enrollment
123
Registered
2025-06-27
Start date
2025-07-29
Completion date
2026-03-30
Last updated
2026-08-10

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

None listed

Brief summary

This is a Phase 1, four-part clinical trial in healthy adult participants to assess the safety, tolerability, pharmacokinetics, and pharmacodynamics of SPT-320, an investigational oral prodrug of agomelatine. Part B evaluates single ascending doses of SPT-320 compared with placebo. Part D studies multiple ascending doses of SPT-320 given once daily for 7 days, compared with placebo.

Interventions

This study evaluates the safety, tolerability, pharmacokinetics (PK), and preliminary pharmacodynamics of SPT-320 and agomelatine following single dose in healthy adult participants. Part B – Single Ascending Dose (SAD) Intervention: Single oral dose of SPT-320 (oprodrug of agomelatine) or placebo Dose levels: As SPT-320 human exposure is unknown, the dose range and number of doses to be assessed are TBD , with a minimum dose of 1 mg and a maximum dose of 400 mg. The safety review committee will

This study evaluates the safety, tolerability, pharmacokinetics (PK), and preliminary pharmacodynamics of SPT-320 and agomelatine following single dose in healthy adult participants. Part B – Single Ascending Dose (SAD) Intervention: Single oral dose of SPT-320 (oprodrug of agomelatine) or placebo Dose levels: As SPT-320 human exposure is unknown, the dose range and number of doses to be assessed are TBD , with a minimum dose of 1 mg and a maximum dose of 400 mg. The safety review committee will review ongoing data to determine dose decisions. Participants will be confined to the Clinical Research Unit for supervised dosing. Design: Randomized, double-blind, placebo-controlled Part D – Multiple Ascending Dose (MAD) Intervention: Multiple oral doses of SPT-320 or placebo once daily for 7 days Dose levels: As SPT-320 human exposure is unknown, the dose range and number of doses to be assessed are TBD, with a minimum dose of 1 mg and a maximum dose of 400 mg. The safety review committee will review ongoing data to determine dose decisions. Participants will be confined to the Clinical Research Unit for supervised dosing. Design: Randomized, double-blind, placebo-controlled

Sponsors

Seaport Therapeutics Australia Pty Ltd
Lead SponsorCommercial sector/Industry

Study design

Allocation
Randomised controlled trial
Primary purpose
Treatment

Eligibility

Sex/Gender
All
Age
18 Years to 55 Years
Healthy volunteers
Yes

Inclusion criteria

1. Male and female participants between the ages of 18 and 55 years, inclusive, at the time of signing the informed consent form. 2. Healthy participants, as determined by the absence of clinically relevant abnormalities in medical history, physical examination, vital signs, 12-lead electrocardiogram, and clinical laboratory tests, as evaluated by the investigator.

Exclusion criteria

1. Current or past history of significant cardiovascular, pulmonary, gastrointestinal, renal, hepatic, metabolic, genitourinary, endocrine (including diabetes mellitus, thyroid disorders), malignancy, hematological, immunological, neurological, or psychiatric disease.

Outcome results

None listed

Source: ANZCTR · Data processed: Aug 25, 2026