IV: 2 ng/kg/min initially, titrate upward by 2 ng/kg/min q15m until intolerance or dose-limiting effects occur. Avoid abrupt withdrawal: gradually decrease dose by 2ng/kg/min q15min.
Nebulized: dosing not well standardized, usually 12.5-50 ng/kg/min
Epoprostenol 
Carboprost
Oxymetazoline
Mometasone
Acebutolol
Indomethacin
Sildenafil
Hydrocortisone 