Taking a dose of 10 mg of Nebilete instead of 7.5 mg can lead to increased side effects, including drowsiness, especially if you are not used to a higher dose. Nebilet (nebivolol) is a beta-blocker that can lower blood pressure and affect heart rhythm, which can make you feel tired or drowsy.

Your blood pressure of 122/75 mmHg and pulse in the range of 75-85 beats per minute are normal, which is a positive signal. I would recommend consulting a doctor if the drowsiness is severe or accompanied by other symptoms such as dizziness or shortness of breath.

If you have any further doubts, it is worth consulting your attending physician. If you are unable to consult your doctor, you can use the teleconsultation here:

https://www.gdziepolek.pl/telekonsultacja/z-kardiologiem

The availability of Nebilet in pharmacies in Polish can be checked at the following address:

https://www.gdziepolek.pl/produkty/52524/nebilet-tabletki/apteki