This might be the reason why IV nitrofurantoin is not available (metabolic acidosis potential)...from a 1958 article in Pediatrics
Fatality From Intravenous Nitrofurantoin
AVRON Y. SWEET M.D.1
1 Department of Pediatrics, Mount Sinai Hospital, New York, New York
Recently one patient died and another came near death because of severe metabollic acidosis following the administration of Furadantoin® Intravenous Solution. (The brochure accompanying the medication does not indicate that metabolic disturbances might result from its use.) Both patients were adults with severe and extensive paralysis due to poliomyelitis and marked respiratory paralysis as well. Both had renal calculi and urinary tract infections with bacteria which were resistant to all but the more toxic antibacterial agents.