Can I drink sage while taking Metformin and Zahron at the same time?

Yes, you can. There are no contraindications to the simultaneous use of the drugs mentioned in the question and sage tea. Due to the fact that the drugs mentioned in the question are dispensed on prescription, I also encourage you to inform the attending physician about all medicines and dietary supplements used, which will allow you to choose a safe and effective pharmacotherapy. I enclose materials that may be interesting and information about the possibility of using teleconsultation: https://www.gdziepolek.pl/telekonsultacja https://www.gdziepolek.pl/artykuly/czy-przyjmowanie-kilku-lekow-jednoczesnie-jest-bezpieczne https://www.gdziepolek.pl/artykuly/czy-mozna-laczyc-leki-ze-soba