The purpose of this study is to evaluate the safety and efficacy of BIOD-123 compared to insulin lispro (Humalog®) when used as part of a basal-bolus regimen in patients with type 1 diabetes.

Inclusion Criteria:

• Established clinical diagnosis of type 1 diabetes, consistent with ADA classification criteria (Diabetes Care 35: S64-S71, 2012), for more than 1 year.
• Age: 18 years old, or older.
• Body Mass Index: between 18 and 35 kg/m2, inclusive.
• Willing to use insulin glargine as the only basal insulin throughout the duration of the trial.
• Willingness not to use insulin pump treatment and only use the study glucose meter and CGM devices during the duration of the trial.

Exclusion Criteria:

• History of known hypersensitivity to any of the components in the study medication
• Treatment with pramlintide or GLP-1 analogs within 30 days of screening or anticipated use of these medications during the course of the study.
• Treatment with oral or intravenous corticosteroids in the last 3 months prior to screening. Standard doses of inhalational corticosteroid used as part of a long term treatment regimen are allowed.
• Consistent recent hypoglycemic unawareness within the last six months
• History of more than two severe hypoglycemic events within six months prior to screening