Dear Ma m Thanks for your query. The persistence of tachycardia after withdrawal of propranolol is governed by the level of physical and mental stress you have. The heart rate will also be dependent upon your basal heart rate (prior to starting beta blockers). Literature, although scarce, suggests that beta blocker rebound may be seen as late as 2 weeks after stopping drug. You should see your doctor to ascertain the kind of rhythm you have and if clinically there is no abnormality, you may wait (after discussing your physician). Sincerely Sukhvinder