Tirzepatide for the Treatment of Concurrent Type 1 Diabetes and Overweight or Obesity

Sponsor
Royal North Shore Hospital
Study ID
NCT06180616
Phase
PHASE2
Status
Not Yet Recruiting

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Conditions

Eligibility Criteria

Sex
ALL
Age
18 Years - 70 Years
Healthy Volunteers
Not accepted

Interventions

  • Tirzepatide — DRUG
    Tirzepatide will be self-administered subcutaneously by study participants via an injection. The drug will be taken weekly following the schedule: 4 weeks at 2.5 mg QW, 4 weeks at 5.0 mg QW, 4 weeks at 7.5 mg QW, 4 weeks at 10.0 mg QW, 4 weeks at 12.5 mg QW, 12 weeks at 15 mg QW. Modification of study drug will be performed if the participant is experiencing significant side effects and cannot tolerate the higher dosage of the study drug. In this instance, the study drug dosage will be reduced to the previously tolerated dosage and held at this dose for a further 4 weeks. One further attempt at dose escalation will be undertaken after 4 weeks, at the discretion of the participant and the study investigator. If recurrent side effects are experienced by the participant, the study drug will be returned to the previously tolerated dosage, and the prescription continued at this dosage for the remainder of the study.

Study Details

This study is a 2-arm, double blinded, randomised clinical trial where 40 participants will be assigned 1:1 to insulin treatment alone (control) or insulin treatment and tirzepatide treatment for 32 weeks. The primary objective is to demonstrate that tirzepatide treatment, dose incremented to 15mg QW for 32 weeks adjunctive to insulin treatment can reduce body weight in patients with T1D and overweight or obesity when compared to insulin treatment alone. The secondary objective is to demonstrate that tirzepatide treatment, dose incremented to 15mg QW for 32 weeks can improve glycaemic control (measured by hbA1c), improve time in range, reduce insulin requirements, and reduce the severity of comorbidities in people with obesity and T1D. This trial includes a 6 month follow-up period.

Key Dates

Start date
Dec 31, 2026
Status verified
Jul 2025
Primary completion
Dec 31, 2028
Completion
Dec 31, 2028

Study Design

Enrollment
40 participants (estimated)
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT

Arms

  • No Intervention: Insulin Treatment
    Participants will remain on their typical insulin therapy regime for 32 weeks
  • Experimental: Tirzepatide Treatment
    Participants will remain on their typical insulin therapy regime and will also receive tirzepatide (dose incremented to 15mg QW) for 32 weeks.

Primary Outcome Measure

Body weight [ Time Frame: 32 weeks ]

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