The aim of the trail is investigate the effect of liraglutide 1.8mg as add-on to insulin for 6 months on carotid intima media thickness and cardiovascular risk factors in subjects with type 1 diabetes mellitus.

Inclusion Criteria:

• Age from 15 to 60 years
• Patients diagnosed with Type 1 Diabetes Mellitus.
• Diabetes duration more than 1 year.
• Both genders.
• C - peptide less than 0.3 nmol/L

Exclusion Criteria:

• Patients with type 2 diabetes mellitus, LADA (latent autoimmune diabetes in adults), MODY (maturity-onset diabetes of youth), or other types of diabetes other than type 1 diabetes mellitus.
• Pregnant patients or desire to become pregnant in the next 6 months.
• Family history of medullary thyroid cancer or multiple endocrine neoplasia 2
• History of pancreatitis
• Familial hypercholesterolemia
• Use of adjunctive treatment to insulin (SGLT-2 [sodium-glucose cotransporter-2] inhibitor, Pramlintide, metformin)
• Start of treatment with statins, ezetimibe or PSCK9 (proprotein convertase subtilisin/kexin type 9) inhibitors, amlodipine, metoprolol in the last 6 months before the study.
• Bariatric surgery
• Use of medications (immunosuppressants, calcineurin inhibitors, mTOR (mammilian target of rapamycin) inhibitors, corticosteroids, aspirin, or anticoagulants)
• Metabolic abnormalities (inborn errors of cholesterol storage metabolism, glycogen storage, abetalipoproteinemia, Reye's disease, LCAT (lecithin-cholesterol acyltransferase) deficiency)