Suspension formulation comprising an insulinotropic peptide

A delivery device comprising a suspension formulation, the suspension formulation comprising:

• a particle formulation comprising:
• an insulinotropic peptide, an antioxidant, a carbohydrate, and a buffer, wherein the insulinotropic peptide is at least one of exenatide, a derivative of exenatide, or an analogue of exenatide;
• and
• a non-aqueous, single-phase suspension vehicle that comprises about 20 wt % to about 60 wt % solvent and about 80 wt % to about 40 wt % pyrrolidone polymer, the suspension vehicle having a viscosity from 5,000 poise to 50,000 poise at 33° C.;
• wherein:
• the solvent is at least one of lauryl lactate, lauryl alcohol, and benzyl benzoate;
• the pyrrolidone polymer is polyvinylpyrrolidone;
• 30 to 90% by weight of the particle formulation is the insulinotropic peptide;
• the particle formulation has a wt % ratio of insulinotropic peptide to antioxidant plus carbohydrate of 1/2 to 10/1;
• and
• the particle formulation is dispersed in the suspension vehicle.