Pharmaceutical composition for treating oxidative stress-induced pathology, comprising a combination of the active principles methionine, cysteine and phenylalanine combined with at least one pharmaceutical excipient； said active principles being present in a molar ratio of methionine/phenylalanine between 2.5 and 12.5； and a molar ratio of methionine/cysteine between 2 and 10.5； and said three active principles being present in free form, as an inner salt, or in the form of a pharmaceutically acceptable salt； wherein said pharmaceutical composition is used for treating one of the oxidative stress-induced pathologies, including intestinal disorders, such as irritations of the intestinal wall, haemorrhoids of Goligher classification grades 1, 2, 3 and 4. The present invention also relates to the use of said composition in the preparation of a medication for treating an oxidative stress-induced pathology.
