A Study of Nasal Glucagon in Participants With Type 1 Diabetes Mellitus

Inclusion Criteria: * Diagnosis of Type 1 Diabetes Mellitus (T1DM) for at least 2 years and receiving daily insulin since the time of diagnosis Exclusion Criteria: * Have a history of hypersensitivity to glucagon or any related products or severe hypersensitivity reactions (such as angioedema) to any drugs * Have a history of pheochromocytoma (that is, adrenal gland tumor) or insulinoma * Occurrence of an episode of severe hypoglycemia (defined as requiring the assistance of another person in the 1 month prior to enrolling in the study) * Have a history of epilepsy or seizure disorder * Are women who are pregnant or lactating * Have, except for the current regimen of insulin therapy and concomitant medication, regular use of or intended use of any over-the-counter or prescription medications or nutritional supplements that treat hyperglycemia or insulin resistance or that promote weight loss within 14 days before dosing * Daily use of systemic beta-blocker, indomethacin, warfarin or anticholinergic drugs * Require daily insulin treatment greater than (\>)1.5 unit/kilograms (U/kg)/body weight