Hello, My husband takes atenolol for a bicuspid aortic valve. He also has a pacemaker. If he takes Cialis he has seizures( full blown epileptic), and after taking antihystamines (xergic) he has had a seizure each night last 2 nights.. These seizures ALWAYS occur at night during sleep. He has had all the tests known to mankind and no diagnosis has been made.I am getting a bit over helplessly watching him have these seizures, and want him to stop taking everything. Does anyone else know about this interaction &/ or why it is happening?