Lithex 300mg Tablet contains lithium carbonate, an established mood stabilizer primarily indicated for the treatment and maintenance of bipolar disorder. Lithium carbonate acts by modulating neurotransmitter activity and stabilizing neuronal excitability, thereby reducing the frequency and severity of manic and depressive episodes. Lithex 300mg is prescribed to manage acute mania, prevent relapse, and maintain mood stability in patients with bipolar affective disorder. The tablet is administered orally, with dosage individualized based on clinical response and serum lithium levels, which require regular monitoring due to lithium’s narrow therapeutic index. Common side effects include gastrointestinal disturbances, tremor, polyuria, and mild cognitive effects; however, serious adverse reactions such as nephrotoxicity, hypothyroidism, and lithium toxicity necessitate vigilant clinical and laboratory surveillance. Patients should maintain adequate hydration and avoid concomitant use of medications that may alter lithium levels, such as diuretics and NSAIDs. Lithex 300mg is contraindicated in individuals with severe renal impairment, hypersensitivity to lithium, or significant cardiovascular disease. It is essential to counsel patients regarding adherence, potential side effects, and the importance of routine monitoring to optimize therapeutic outcomes and minimize risks associated with lithium therapy.