PEGylated, extended insulins are insulins which, compared with human insulin, has one or more extensions extended from the A1, B1, A21 and/or B30 position(s), said extension(s) consist(s) of amino acid residue(s) and wherein a PEG moiety, via a linker, is attached to one or more of the amino acid residues in the extension(s). PEG is polyethyleneglycol. Such PEGylated, extended insulins have higher bioavailability and a longer time-action profile than regular insulin and are in particular suited for pulmonary administration and can, conveniently, be used to treat diabetes.