I'm afraid to take Bisoprolol fumarate 1.25mg for arrhythmias, because I read that it can lower blood pressure, is that true?

It is difficult to give a clear answer based on such a short description. As a pharmacist, I can only give you general information: Bisoprolol is a beta-blocker drug that is often prescribed to treat a variety of heart conditions, including arrhythmias. One of the side effects of beta-blockers can be a reduction in blood pressure. The risk of side effects does not mean that they have to occur in every patient, it is a very individual matter.

If you've noticed a drop in your blood pressure over the past few weeks and are concerned that Bisoprolol may further lower your blood pressure, it's important to talk to your doctor about your concerns. Your doctor may adjust your dose or consider other treatment options. Any modifications in therapy, including discontinuation of the drug, should be made after consultation with the attending physician who is familiar with your health condition in detail. You can read more about it here:

https://www.gdziepolek.pl/artykuly/czy-jak-i-kiedy-mozna-odstawic-leki

It is not recommended to change the dose yourself or stop treatment without consulting your doctor. If you have concerns about your treatment, the first thing you should do is consult your doctor. If you do not have the possibility of an in-person visit, I encourage you to take advantage of the teleconsultation, e.g. via the Gdziepolek.pl portal:

https://www.gdziepolek.pl/telekonsultacja

The GdziePoLek.pl service also allows you to book the medicine at a selected stationary pharmacy and collect it after presenting a prescription:

https://www.gdziepolek.pl/produkty/10731/bibloc-tabletki-powlekane/apteki