The invention relates to the chemical and pharmaceutical industry and consists of a rectal gel substance for treating diseases of the intestinal/digestive tract including nonspecific ulcerative colitis Crohn s disease fistulae etc. and also complications during the course of treatment of said diseases. The invention provides an antimicrobial and antiprotozoal effect and has good penetration capabilities. The technical result achieved by carrying out the claimed invention consists in increasing the effectiveness of treating non infectious inflammatory diseases of the intestinal/digestive tract and in shortening the duration of treatment. Said technical result is achieved by means of a polycomplex gel for treating diseases of the intestinal/digestive tract said gel containing metronidazole and thymogen as active substances and containing the following auxiliary substances in the following composition and ratio of components in grams with a total mass of gel of 150 grams: metronidazole: 0.1 2g thymogen: 0.001 0.05g carbopol: 0.2 1.0g propylene glycol: 8.0 11.0g EDTA disodium salt: 0.001 0.08g propyl parahydroxybenzoate: 0.015 0.04g methyl parahydroxybenzoate: 0.035 0.08g sodium hydroxide: an amount sufficient for producing the necessary pH distilled water: the remainder.