Table 5

 Interactions of psychotropic and cardiac medications: interactions involving lithium and carbamazepine

MedicationEffect on psychotropic or cardiac agent
Interactions involving lithium
    Diuretics that cause sodium lossIncrease blood lithium levels
    Calcium channel blockersEnhance lithium toxicity; bradycardia
    Angiotensin converting enzyme inhibitorsEnhance lithium toxicity
    MethyldopaEnhance lithium toxicity
Interactions involving carbamazepine
    Calcium channel blockersEnhance carbamazepine toxicity
    AntiarrhythmicsPotentiate delay in cardiac conduction