<unk>  is a powdered form of<unk> , delivered with an inhaler into the lungs where it is absorbed. In general inhaled<unk> s have been more rapidly absorbed than subcutaneous injected<unk> , with faster peak concentration in serum and more rapid metabolism. Exubera, developed by Inhale Therapeutics (later named Nektar Therapeutics), became the first inhaled<unk>  product to be marketed, in 2006 by Pfizer, but poor sales led Pfizer to withdraw it in 2007. Afrezza, a monomeric inhaled, ultra rapid-acting<unk>  developed by Mannkind, was approved by the FDA in 2014 and is the only inhaled<unk>  comercialized at the moment.
Inhalable insulin
Pulsatile insulin
Regular insulin
Ultralente insulin
Lente insulin
Insulin aspart
Insulin detemir
Insulin glargine