What symptoms are associated with lithium toxicity levels over 2.5 mEq/L?

Lithium toxicity becomes particularly serious at levels over 2.5 mEq/L, leading to critical manifestations in the central nervous system and cardiovascular system. Symptoms such as CNS depression, which can include confusion, lethargy, and even coma, indicate severe impairment of brain function. Additionally, arrhythmias, or irregular heartbeats, reflect cardiac involvement, which can be life-threatening if not addressed promptly. Seizures are another severe consequence of lithium toxicity, indicating significant neurological distress.

These symptoms highlight the dangerous potential of lithium when its levels exceed therapeutic ranges, emphasizing the importance of careful monitoring in patients undergoing lithium therapy. Other options listed include symptoms that may occur at lower levels of toxicity or in other conditions, but they do not encapsulate the severe risk associated with levels above 2.5 mEq/L.