Answer
Yes. Slowing the heart is part of its intended action, but an unusually slow pulse with faintness, severe weakness or breathlessness needs clinical assessment.
Sources for this answer
- Bisoprolol Fumarate 0.5mg/ml Oral Solution — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.