Is it possible to combine the use of Nimesil with Metronidazole and Duomox?

Yes, you can. These drugs do not interact with each other in clinically relevant ways that would preclude their combined use. Due to the fact that all of these medicines are prescription, please follow your doctor's instructions. I also encourage you to inform the attending physician about all the medicines and dietary supplements used, which will allow you to choose a safe and effective pharmacotherapy. I enclose additional information that may be helpful: https://www.gdziepolek.pl/artykuly/czy-przyjmowanie-kilku-lekow-jednoczesnie-jest-bezpieczne https://www.gdziepolek.pl/artykuly/czy-mozna-laczyc-leki-ze-soba