Both Toujeo and Lantus are long-acting insulins that contain glargine, however Toujeo is more concentrated containing 300 units per mL of glargine, compared to Lantus’s 100 units per mL. When you take this into account the cost of Toujeo and Lantus works out approximately the same (real cost value $30.76/mL for Toujeo compared with $30.23/mL for Lantus).