Drug Interactions between Asendin and thalidomide

MONITOR: Thalidomide can commonly cause drowsiness/sedation and may have additive effects with other drugs that cause central nervous system (CNS) depression.

MANAGEMENT: Caution is advised when thalidomide is used with other CNS depressants such as anticonvulsants, antihistamines, antidepressants, antipsychotics, anxiolytics, opioids, and sedatives/hypnotics. Patients should be advised to avoid hazardous activities requiring mental alertness and motor coordination until they know how these agents affect them, and to notify their physician if they experience excessive or prolonged CNS effects that interfere with their normal activities. Dosage reductions may be necessary. Thalidomide should preferably be administered at bedtime to reduce the impact of somnolence. Alcohol use is not recommended.

MONITOR: Thalidomide can cause bradycardia and may have additive effects with other drugs that decrease heart rate. Cases of bradycardia have been associated with thalidomide use, some requiring medical interventions. The clinical significance and underlying aetiology of the bradycardia observed with thalidomide treatment have not been established. However, the potential for additive bradycardic effects should be considered when used with other drugs that slow cardiac conduction, including non-cardiac drugs such as lacosamide, lithium, and tricyclic antidepressants. Because bradycardia is a risk factor for torsade de pointes arrhythmia, concerns also exist when thalidomide is used with drugs that prolong the QT interval or cause torsade de pontes.

MANAGEMENT: Caution is advised when thalidomide is used with drugs that can slow the heart rate or induce torsade de pointes arrhythmia. Patients should be monitored for bradycardia, atrioventricular block and syncope, and advised to seek medical attention if they experience dizziness, lightheadedness, fainting, shortness of breath, or slow or irregular heartbeat. A dose reduction of thalidomide or discontinuation may be required.

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