IRCT20201207049638N1 IRCT 2020-12-19 Shahid Beheshti University of Medical Sciences Effect of Metformin in control of Diabetes type 1 The Effect of Metformin Accompanied by Insulin on weight and insulin dosage in diabetic type 1 adolescents 2020-01-30 anticipated 50 Complete https://irct.ir/trial/52867 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: Randomization made by an application "Randomizer" and was totally computer-based. Patients divided into two groups randomly and equally, Blinding description: Patients and physician was not notified about prescribed drug (metformin) and only researcher was notified about studied groups. 3 Diabetes Mellitus Type 1. Intervention 1: Control group: patients who were under multiple daily insulin injection. dosage is based on patients weight. Basal insulin: Lantus insulin by Sanofi 100U/ml, Bolus Insulin: Novorapid insulin by Novorapid 100U/ml. Intervention 2: Intervention group: patients who were under multiple daily insulin injection like control group, 500 mg metformin, every 12 hours, added to their medication for 9 months. Metformin tablets by Abidi company. Yes - There is a plan to make this available What will be shared: All data will presented completely When: After publication To whom: All researchers who request data Conditions: In case of citation of the study Where to obtain: Corresponding author How to obtain: Authors have to contact corresponding author via Email and in case of citation in their article, all data will share with them. Comments: