Parenteral hyperalimentation is an important means of nutritional support for critically ill patients. Calculating the amount of additives necessary for the appropriate compounding of hyperalimentations is a tedious process with many opportunities for error. A new computer program written in Pascal has been created to reduce pharmacy processing time. Menus and single-keystroke entry are implemented wherever practicable. A hard-copy printout and an individualized label are generated on command. Program testing has resulted in an 88% reduction of processing time.