Since the beginning of taking Moklar I have diarrhea, will this side effect pass?

According to the Summary of Product Characteristics, diarrhoea and acrostrointestinal disorders are some of the common side effects of Moklar: https://www.gdziepolek.pl/produkty/49986/moklar-tabletki-powlekane/ulotka/99569 In most cases, side effects are dose-dependent and often disappear later in treatment. However, if after 2 months the diarrhea has not decreased, it is best to talk about it with the attending physician familiar with your current state of health in detail. I also encourage you to report the occurrence of side effects of the preparation. Reporting side effects increases control over commercially available medicines. We wrote about how and why to report side effects in the article: https://www.gdziepolek.pl/artykuly/jak-i-dlaczego-zglaszac-dzialania-niepozadane