A comparative study of the effectiveness of a home-made amino acide drug for nitrous parenteral feeding--amikin and Swedixh drug--aminosol hydrolysate was corried out in 84 patients operated upon gastrointestinal ograns. The effectiveness of the parenteral feeding was estimated on the grounds of the clinical condition of patients, their weight, state of nitrous balance, urinary excretion, of total amino and peptide nitrogen, blood urea nitrogen and ammonia.