Caution is advised when using this drug in cordarone acquistare senza perscription the elderly because they may be more sensitive to the effects of the drug, including fast slow irregular heartbeat. Also, Cordarone can stay in your body for months after treatment is stopped. This has occurred in to of patients in various series, and significant heart block or sinus bradycardia has been seen in to. These electrophysiologic effects are reflected in decreased sinus rate of 15 to 20 increased PR and QT intervals of about 10 the development of U-waves, and changes in T-wave contour. Because absorption and elimination are variable, maintenance-dose selection is difficult, and it is not unusual to require dosage decrease or discontinuation of treatment. The risks and complications of antiarrhythmic therapy with Cordarone must be weighed against its benefits in patients whose lives are threatened by cardiac arrhythmias. Number of criteria have been proposed, however, for identifying patients who remain inducible but who seem likely nonetheless to do well on Cordarone.