Is after Ircolon may excessively fall out hair?

No, according to the Summary of Product Characteristics, hair loss is not listed among the side effects of Ircolon:
https://www.gdziepolek.pl/produkty/38225/ircolon-tabletki/apteki

Hair loss can be the result of many factors, including genetics, health status, hormonal changes, nutrition, medications, and other factors. In this case, it may be related to nutritional deficiencies resulting from intestinal diseases. I encourage you to make an appointment with your doctor who will adjust the treatment according to your current clinical condition. If it is not possible to visit a stationary visit, I encourage you to use teleadvice via, for example, the Gdziepolek.pl portal: https://www.gdziepolek.pl/telekonsultacja

Within his competence, the pharmacist may propose over-the-counter hair loss preparations, e.g.: Merz Spezial Dragees: https://www.gdziepolek.pl/produkty/48488/merz-spezial-dragees-drazetki/apteki