If you take beta or calcium channel blockers or digitalis for heart problems, watch for periods of unexplained dizziness or fatigue. Shortness of breath, lightheadedness, lack of energy and fainting are about the only symptoms of this condition.
Patients frequently blame their lack of energy on advancing years, sigh and do nothing about it.
A physician can easily spot bradycardia, if it happens to be present at the moment he checks the patient's pulse. However, it often comes and goes, and there are other things, like undetected infections, which can cause the same symptoms. Medication-induced bradycardia can occur even in patients with no heart disease. Beta blockers are also used in the treatment of glaucoma. Once medications are known to cause a too-slow heartbeat, treatment may amount to no more than adjusting or changing the medication.