I have symptoms with Lopressor that include vocal cord closure, extreme fatigue, too low B/p,mental confusion ,muscle weakness, light sensitivity, trouble breathing during the day...So...in desparation I cut 25 mg in half and many symptoms have begun to decrease. I suspect all smooth muscle were effected that is why I have so many symptoms. It was used to protect an aneurysm that will be fixed 21 july...AM I right about this? Lopressor could cause even more obstructive sleep apnea. I have celiac spru and am allergic to chemicals.