Stewart has been warned by his psychiatrist not to miss any of his medication-check appointments.The drug he is taking can be lethal if not monitored regularly.Which of the following drugs is Stewart most likely taking?

A) Anticonvulsants
B) Lithium
C) Tricyclics
D) MAOIs

Lithium is commonly used to treat bipolar disorder, and requires close monitoring of blood levels to prevent toxicity. Missing medication checks can result in dangerous levels of lithium in the body. Anticonvulsants are also used to treat bipolar disorder, but do not typically require such frequent monitoring. Tricyclics and MAOIs are used to treat depression, but do not have the same risk of toxicity with missed medication checks as lithium.