To compare the efficacy of Generex Oral-lyn™ RapidMist™ System and standard regular human insulin therapy as measured by HbA1c, in type-1 diabetes mellitus subjects on BID NPH intermediate acting insulin therapy.

This is a 26 week open-label, randomized, multi-center, active comparator study to compare oral spray insulin (Generex Oral-lyn™) with regular human insulin therapy as measured by HbA1c, and number of hypoglycaemic episodes in type-1 diabetes mellitus subject. All subjects will be on BID NPH intermediate acting insulin therapy. If subject is using long acting insulin (Glargine, Detemir, etc.), he/she must be switched to NPH intermediate acting insulin. If on insulin analogue (Novolog, Lispro, Aspart, Aphidra, Glulisine, or any other analogue available in the subject's geographical area), the subject must be switched to regular human insulin 3 times a day.

Inclusion Criteria:

• Be male or female between the ages 18 to 75 years
• Type 1 diabetes mellitus patients (according to ADA and/or WHO classification) who have >1 year history of type 1 DM and are currently managed with daily insulin injections totalling 0.3 to 0.8 IU/kg of body weight;
• Current physical examination, vital signs and ECG at screening that reveals no clinically significant abnormalities;
• Have a body mass index (BMI) <27;
• 8.5% (inclusively)\