Aerosolne formulacije, ki obsegajo formoterol fumarat dihidrat, potisni plin, etanol in po izbiri steroid, kjer ima formoterol fumarat dihidrat vsebnost vode 4,8-4,28 mas. %
A pharmaceutical aerosol formulation comprising formoterol fumarate di-hydrate in suspension, and a steroid in suspension, and a propellant, ethanol, and optionally a surfactant, wherein the formoterol fumarate di-hydrate has a water content of about 4.8 to 4.28% by weight.