Sympathectomy (a surgical procedure where certain nerves are removed)—Use with caution. The effects of this medicine may be increased.
http://www.mayoclinic.org/drugs-supplements/bisoprolol-and-hydrochlorothiazide-oral-route/before-using/DRG-20071051
http://www.mayoclinic.org/drugs-supplements/bisoprolol-and-hydrochlorothiazide-oral-route/before-using/DRG-20071051