Can I use sedative tablets, e.g. Nervina Antistres, when taking Nebilet tablets?

Yes, you can. There are no contraindications to the simultaneous use of the drugs listed in the question. Due to the fact that Nebilet is a prescription drug, therefore the legitimacy and need for its use in therapy is assessed by the doctor. 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