All of the following generic medications are Selective Serotonin reuptake Inhibitors (SSRIs) except: (Select all that apply, may be one, some or all).

Long-term maintenance therapy in Bipolar disorder focuses on preventing recurrence of mood episodes, particularly depressive relapses which are common and disabling. Maintenance agents are selected based on their ability to stabilize mood over time with a favorable side effect profile. Some medications are more effective for acute mania, while others are better suited for long-term stabilization. Identifying the correct agent is essential for sustained symptom control and improved quality of life.

Rationale:
A. Divalproex sodium is effective for acute manic episodes and is commonly used in patients with rapid cycling or mixed features. While it may be used in maintenance, it is not primarily preferred for long-term prevention of depressive episodes. Its side effect profile, including hepatotoxicity and weight gain, may also limit long-term use in some patients.

B. Olanzapine is useful in acute mania and can be used in maintenance therapy, often in combination with other agents. However, it is associated with significant metabolic side effects such as weight gain, hyperlipidemia, and insulin resistance. These risks make it less favorable as a primary long-term maintenance option compared to other agents.

C. Lamotrigine is particularly effective for long-term maintenance of bipolar disorder, especially in preventing depressive episodes. It works by stabilizing neuronal membranes and modulating glutamate release. Its relatively favorable side effect profile and efficacy in reducing relapse make it a preferred option for maintenance therapy.

D. Carbamazepine is used in acute mania and in some maintenance cases, particularly when patients do not respond to first-line agents. However, it has a higher risk of drug interactions and adverse effects such as bone marrow suppression. These limitations make it less commonly chosen as a primary long-term maintenance medication.

Lithium is a mood stabilizer widely used in the management of bipolar disorder, but it has a narrow therapeutic index, making toxicity a significant clinical concern. Elevated serum lithium levels can affect multiple organ systems, particularly the neurologic, renal, and cardiovascular systems. Toxicity may occur due to dehydration, renal impairment, or drug interactions. Early recognition of symptoms is essential to prevent progression to severe complications.

Rationale:
A. Tremor is one of the earliest and most common neurologic signs of lithium toxicity. It may begin as a fine tremor and progress to a coarse, irregular tremor as serum levels rise. This reflects lithium’s effect on neuromuscular excitability and central nervous system function, signaling the need for prompt evaluation.

B. Death can occur in severe lithium toxicity due to complications such as seizures, arrhythmias, or multi-organ failure. Extremely elevated lithium levels can overwhelm compensatory mechanisms, leading to life-threatening outcomes. This underscores the importance of monitoring serum levels and recognizing early warning signs.

C. Blurred vision is a neurologic manifestation associated with lithium toxicity and may occur alongside confusion, ataxia, and decreased coordination. These symptoms indicate central nervous system involvement and worsening toxicity. Visual disturbances are important clinical clues requiring immediate intervention.

D. Increased urine output is more commonly associated with lithium’s chronic adverse effect of nephrogenic diabetes insipidus rather than acute toxicity. Toxicity more often leads to dehydration and potential renal impairment rather than increased urine output. Therefore, it is not a defining feature of lithium toxicity.

E. Electrocardiogram changes can occur in lithium toxicity, including T-wave flattening or inversion and conduction abnormalities. Lithium interferes with cardiac electrical activity, particularly at higher serum levels. Continuous cardiac monitoring may be necessary in moderate to severe toxicity.

F. Cardiac toxicity is a serious complication of elevated lithium levels, resulting in arrhythmias, hypotension, and conduction disturbances. Lithium’s effect on myocardial cells can impair electrical signaling and contractility. This contributes to the potentially life-threatening nature of severe toxicity.