<unk>  (VX-809) is a pharmaceutical drug that acts as a chaperone during protein folding and increases the number of CFTR proteins that are trafficked to the cell surface. It is available in a single pill with ivacaftor; the combination,<unk> /ivacaftor (brand name Orkambi), is used to treat people with cystic fibrosis who are homozygous for the F508del mutation in the cystic fibrosis transmembrane conductance regulator (CFTR) gene, the defective protein that causes the disease. It was developed by Vertex Pharmaceuticals and the combination was approved by the FDA in 2015. As of 2015,<unk>  had no medical use on its own.
Lumacaftor
Macimorelin
Liranaftate
Exenatide
Insulin degludec
Tesamorelin
Acitretin
Ulipristal acetate