Phase 1 Study to Explore the Safety and Pharmacokinetics of DAPAglifozin in Adolescents and Adults With Type 1 Diabetes

1. Provision of informed consent from participant and all legal representatives prior to any study specific procedures
2. Female and/or male aged 12 to 21years (both inclusive)
3. Subject must have type 1 diabetes (as diagnosed clinically) ≥ 12months
4. without completely inadequate glycemic control, defined as local laboratory A1c above 12.5% (subjects will be stratified according to glycemic control being in target (A1c 5.5 to 7.4%), slightly elevated (7.5 - 9.0%) or clearly elevated 9.1 - 12.5% ) obtained at the screening visit (Note: A one-time central laboratory re-test of the A1C is allowed)
5. Insulin use with an average daily dose between 0.6 - 2.0 U/kg, either continuous subcutaneous insulin infusion, (CSII) or multiple doses (at least 2x/day) of insulin
6. BMI 18.0 to 35.0 kg/m2 for adults or BMI between 10th and 99th age and gender related centile for pediatric patients
7. Minimum weight of 50 kg
8. Women of childbearing potential (WOCBP) and men must be using an acceptable method of contraception to avoid pregnancy throughout the study as judged by the investigator
9. WOCBP must have a negative urine pregnancy test at screening as well as at Visit 2 and Visit 4.
10. Women must not be breastfeeding

Exclusion Criteria:

1. History of T2DM, maturity onset diabetes of young (MODY), pancreatic surgery or chronic pancreatitis
2. Any use of oral hypoglycemic agents within 12 months prior to the screening visit
3. History of diabetes ketoacidosis (DKA) within 12 weeks prior to prior to the screening visit
4. History of diabetes insipidus
5. History of hospital admission for glycemic control (either hyperglycemia or hypoglycemia) within 3 months prior to prior to the screening visit
6. Frequent episodes of hypoglycemia as defined by more than one episode requiring assistance, emergency care (paramedics or emergency room care) or glucagon therapy, or more than 2 unexplained episodes of symptomatic hypoglycemia within 3 months prior to the screening visit. An unexplained event is defined as an event that cannot be explained by circumstances such as dietary (e.g. missed meal), strenuous exercise, error in insulin dosing, etc.
7. Hypoglycemic unawareness
8. History of Addison's disease or chronic adrenal insufficiency
9. Prisoners or subjects who are involuntarily incarcerated
10. Subjects who are compulsorily detained for treatment of either a psychiatric or physical (eg, infectious disease) illness
11. Replacement or chronic systemic corticosteroid therapy, defined as any dose of systemic corticosteroid taken for > 4 weeks within 3 months prior to Day -3 visit. NOTE: Topical or inhaled corticosteroids are allowed.
12. Any unstable endocrine, psychiatric, rheumatic disorders as judged by the Investigator.
13. Subject is, in the judgment of the Investigator, unlikely to comply with the protocol or has any severe concurrent medical or psychological condition that may affect the interpretation of efficacy or safety data.
14. Subject with any condition which, in the judgment of the Investigator, may render the subject unable to complete the study or which may pose a significant risk to the subject.
15. Subject is currently abusing alcohol or other drugs or has done so within the last 6 months.
16. Subject is a participating investigator, study coordinator, employee of an investigator or immediate family member of any of the aforementioned.
17. Administration of any other investigational drug within 30 days of planned enrolment to this study.
18. No clinical conditions or clinically significant abnormalities, in any laboratory value(s) collected after screening and prior to randomization which, in the Investigator's judgment, should preclude entry into the treatment period