Sanofi's rivals in the insulin field are nipping at its heels – Lantus sales dipped 5 per cent in the first half of 2015, and analysts don't expect Toujeo to make up for its decline.

The list price of Basaglar will be $316.85 for a pack of five pens, 15% below the list price of Lantus. The companies also hope to steal market share from Novo Nordisk, undercutting the long ...