However, many individuals can take this medicine without any sign of asthma worsening. And this adverse
side effect may occur
long after the initiation of InderalĀ® (propranolol), but seldom as long after as 20 years. For that reason, it would be unwise to assume that your symptoms are on the basis of asthma. In truth, given the recent increase in nocturnal irregular heartbeats, at least some of your symptoms could be on the basis of abnormal heart rhythms.