Bradyarrhythmia
Initiation of Gilenya treatment results in a transient decrease in heart rate and may also be associated with atrioventricular conduction delays (see sections 4.8 and 5.1). Therefore, all patients should be observed for a period of 6 hours for signs and symptoms of bradycardia. Should post-dose bradyarrhythmia-related symptoms occur, appropriate clinical management should be initiated and observation should be continued until the symptoms have resolved.
After the first dose, the decline in heart rate starts within one hour and is maximal at approximately 4-5 hours. With continued administration, heart rate returns to baseline within one month. Conduction abnormalities were typically transient and asymptomatic. They usually did not require treatment and resolved within the first 24 hours on treatment.
Gilenya has not been studied in patients with sitting heart rate less than 55 beats per minute, patients receiving concurrent therapy with beta blockers or in those with a history of syncope.
Gilenya has also not been studied in patients with second degree or higher AV block, sick-sinus syndrome, ischaemic cardiac disease, congestive heart failure or significant cardiovascular disease. Use of Gilenya in such patients should be based on overall benefit-risk assessment and careful observation during initiation of therapy is recommended due to the potential for serious rhythm disturbances. Before initiation of treatment in these patients, advice from a cardiologist is recommended.
Gilenya has not been studied in patients with arrhythmias requiring treatment with class Ia (e.g. quinidine, disopyramide) or class III (e.g. amiodarone, sotalol) antiarrhythmic medicinal products. class Ia and class III antiarrhythmic medicinal products have been associated with cases of torsades de pointes in patients with bradycardia. Since initiation of Gilenya treatment results in decreased heart rate, Gilenya should not be co-administered with these medicinal products.
At treatment initiation in patients receiving beta blockers, or other substances which may decrease heart rate (e.g. verapamil, digoxin, anticholinesteratic agents or pilocarpine), caution should be exercised because o |