Lasix is a diuretic drug and this makes it the perfect treatment for issues involving water retention. Since an edema occurs when there is an underlying medical condition, it makes the body heavy and susceptible to different types of infections and even complications, it is necessary to treat the fluid buildup using Lasix. Lasix is prescribed to patients who have fluid retention issues. Whether the buildup of water is generalized or localized, using Lasix can help solve the issue. This is why Lasix is the most preferred diuretic by medical professionals as it is very efficient in draining excess fluid in the body.