Which side effect is NOT typically associated with lithium use?

Lithium is primarily used as a mood stabilizer, particularly for the treatment of bipolar disorder, and it is known for its variety of side effects. The side effects commonly associated with lithium include nausea, weight gain, and polyuria.

Nausea can occur due to lithium's effect on the gastrointestinal system, especially during the initiation of therapy or dosage adjustments. Weight gain is another well-documented concern, often related to long-term use. Polyuria, which refers to excessive urination, is also a frequent side effect due to lithium's impact on kidney function and its influence on antidiuretic hormone.

In contrast, flatulence is not a typical side effect associated with lithium therapy. While gastrointestinal disturbances can occur, specifically mentioning flatulence as a primary side effect is not supported by clinical observations or literature. Therefore, recognizing that flatulence is not classified among the common side effects of lithium makes it the correct choice in this context.