Overview

The purpose of this clinical study is to look at the safety and tolerability of switching from semaglutide to CagriSema, for participants who have type 2 diabetes. All participants will get CagriSema, the treatment being tested. Participants will be in this clinical study for about 6 months.

Eligibility

Inclusion criteria:

• Male or female (sex assigned at birth, inclusive of all gender identities).
• Age 18 years or above at the time of signing the informed consent.
• Diagnosed with type 2 diabetes mellitus (T2DM) greater than or equal to (≥) 180 days before screening.
• Stable once-weekly dose ≥ 90 days before screening of branded s.c. semaglutide. Branded semaglutide s.c. includes Ozempic and Wegovy. Participants on compounded semaglutide are ineligible.
• Not on treatment with oral antidiabetic drugs or on stable daily dose(s) ≥ 90 days before screening of any of the following antidiabetic drug(s) or combination regimen at effective or maximum tolerated dose (MTD) as judged by the investigator: metformin and/or sodiumglucose co-transporter-2 (SGLT2) inhibitor.
• Glycated haemoglobin (HbA1c) 6.5-10.5 percentage (%) (48-91 millimoles per mole \[mmol/mol\]) (both inclusive) as determined by central laboratory at screening.
• Body mass index (BMI) ≥ 25 kilograms per square meter (kg/m\^2) at screening. BMI will be calculated in the electronic case report form (eCRF) based on height and body weight at screening.

Exclusion criteria:

• Female who is pregnant, breast-feeding or intends to become pregnant or is of childbearing potential and not using a highly effective contraceptive method from screening.
• Renal impairment with estimated glomerular filtration rate (eGFR) less than (\<) 30 milliliter per minute per 1.73 square meter (mL/min/1.73 m\^2) as determined by central laboratory at screening.
• Treatment with any medication for the indication of diabetes or obesity other than stated in the inclusion criteria within 90 days before screening. However, short term insulin treatment for a maximum of 14 consecutive days and prior insulin treatment for gestational diabetes are allowed.
• Uncontrolled and potentially unstable diabetic retinopathy or maculopathy. Verified by an eye examination performed within 90 days before screening or in the period between screening and randomisation. Pharmacological pupil-dilation is a requirement unless using a digital fundus photography camera specified for non-dilated examination.
• A self-reported change in body weight \> 5% within 90 days before screening irrespective of medical records.
• Use of personal continuous glucose monitoring (CGM) devices. Participants currently using personal CGM devices must discontinue use prior to screening and throughout study participation.