<unk>  is a medication used to treat pulmonary arterial hypertension (PAH), scleroderma, Raynaud's phenomenon and other diseases in which the blood vessels are constricted and blood cannot flow to the tissues. This damages the tissues and causes high blood pressure. There is ongoing research into using it as a frostbite treatment.<unk>  works by opening (dilating) the blood vessels to allow the blood to flow through again. It was developed by the pharmaceutical company Schering AG and is marketed by Bayer Schering Pharma AG in Europe and Actelion Pharmaceuticals in the USA.<unk>  is given via inhalation, and a therapeautic benefit of the drug is that a very low dose is required because of the deposition in the lung.<unk>  has few systemic side effects for that reason.
Iloprost
Carboprost
Latanoprost
Travoprost
Mometasone
Beclometasone
Latanoprostene bunod
Ibotenic acid