... source of the tachychardia till August but Ive been on Atenelol for over a year. The doctor just increased my dose and I'm afraid of what happens when I try to get off the drug. Could there be a rebound effect when I try to taper off of Atenelol? In otherwords, could things be worse after coming off Atenelol? Can someone become dependant on Atenelol after chronic use? Thank you