The purpose of this study is to compare the safety, tolerability, pharmacokinetic (PK), and comparative bioavailability of repeated administration of GSBR-1290 in healthy overweight/obese participants.

This is a 2-part study in which Part 1 will compare the PK of GSBR-1290, administered as tablet and capsule, using a 2-period, 2-sequence, crossover design in approximately 16 healthy overweight/obese participants. Part 2 will evaluate multiple-ascending doses of GSBR-1290 tablet in 3 cohorts, using 3 different titration regimens. Secondly in Part 2, the study will evaluate the comparative bioavailability of GSBR-1290 tablet versus capsule at a potentially clinically efficacious dose at steady state in Cohort 3.

Inclusion Criteria:

1. Provided evidence of a signed informed consent before any study-related activities are initiated and be willing to comply with all study procedures.
2. Healthy overweight or obese adult men and women.
3. Age greater then or equal to (>=)18 and less than or equal to (<=) 75 years.
4. Body mass index (BMI) >=27.0 kilogram per square meter (kg/m^2).

Exclusion Criteria:

1. History or presence of clinically significant cardiovascular, pulmonary, hepatic, renal, hematological, gastrointestinal, endocrine, immunologic, dermatologic, or neurological disease.

De-identified individual patient data for variables necessary to address the specific research question in an approved data sharing request

Data sharing requests will be considered beginning 36 months after the study publication (manuscript accepted for publication) and either 1) the product have been granted marketing authorization in at least two regulatory jurisdictions, or 2) clinical development for the product and/or indication discontinues and the data will not be submitted to regulatory authorities. There is no end date for eligibility to submit a data sharing request for this study.

Researchers will submit a request containing the research objectives, endpoints/outcomes of interest, statistical analysis plan, data requirements, publication plan, and qualifications of the researcher(s). Structure Therapeutics does not grant external requests for individual de-identified patient data for the following purposes:

• re-evaluating safety and efficacy end points already addressed in the product labelling,
• assessing safety or efficacy for an indication in current development

Requests are reviewed by a committee of internal advisors, and if not approved, may be further arbitrated by a panel of external advisors. Upon approval, information necessary to address the research question will be provided under the terms of a data sharing agreement.

Part 1 is open-label, 2-period, 2-sequence, cross-over and Part 2 is double blinded