Hello."Concor"(
bisoprolol) is a drug prescribed mainly to control
heart rate.
"Concor"belongs to a group of drugs called beta blockers.Those drugs
one of its side effects is bronchial constriction(minor with bisoprolol that with other drugs oldest of that group ,for example
atenolol).
Wheezing sound indicate that your mother was suffering bronchitis(allergic
viral...)and while the disease is active,"Concor"should not be taken
because increases the symptoms.
After the healing of bronchitis,"Concor"can be taked again,except if
the patient suffers chronic
obstructive pulmonary disease or
bronchial asthma.
If the patient not suffers that pathologies,can take "Concor"quietly;besides the dose
that your mother take(2.5 mgr)is low.
I wish you good health.
(In case the answer would have been useful please indicate this)