Lasix is also given as a piggyback (iv bag) over 15-30 minutes at my hospital (where I work as a clinical pharmacist). It is given as an IV push to adults over 2-5 minutes receiving multiple units of blood. Rapid Lasix infusion can cause sudden hypotension and should strictly be avoided. I personally do not receive lasix in between units. I receive Solu-Cortef (hydrocortisone injection), benedryl IV, and tylenol by mouth. Word of advice to patients who haven't received Lasix in the past: If you have a sulfa allergy make sure you mention that/remind your doctor. Some patients allergic to sulfa drugs may be cross-sensitive to Lasix as well, although the incidence of that is fairly low. Usually patients with underlying heart conditions such as a low LVEF or enlarged heart (heart failure) require Lasix. Hope this helps.