Lasix (Furosemide) is also used in humans in a dose of around 0.4mg/kg and works as a loop diuretic and a mild vasodilator. That is, the Lasix causes the kidneys to filter out a great deal of fluid from the body at the same time the Lasix causes the body's blood vessels to expand slightly. This gives the effect of removing fluid from the body (usually for the purposes of getting fluid out of the lungs) and lowering blood pressure. I have done some quick and incomplete research on the use of Lasix in ferrets (i.e. I asked my vet in passing) and she said that they would pretty much use Lasix to do the same for a ferret. -Rommie L. Duckworth EMT- Paramedic / Firefighter: Connecticut Scamper (the scamp) & Punkin (the punk) [Posted in FML issue 1528]