Final answer:
Lithium is the drug of choice for bipolar disorder during the manic stage, as it helps to control extreme mood swings. It works by altering brain chemicals involved in mood regulation. Antipsychotics may also be used for manic symptoms, but lithium is often the first-choice treatment.
Step-by-step explanation:
The drug of choice for bipolar disorder that is effective in the manic stage is lithium. Lithium is a mood stabilizer that helps control the extreme mood swings associated with bipolar disorder. It is particularly effective in managing the manic episodes of the disorder.
Lithium works by altering the levels of certain chemicals in the brain that are involved in mood regulation. It helps to reduce the intensity and duration of manic episodes, making it a valuable treatment option for bipolar disorder.
In addition to lithium, other medications such as antipsychotics may also be used to manage the manic symptoms of bipolar disorder. However, lithium is often considered the first-line treatment for this stage of the disorder.