Which of the following is a symptom of Lithium Toxicity?

Tachycardia is a recognized symptom of lithium toxicity, which can occur when lithium levels in the body become excessively high. Lithium is a mood stabilizer commonly used in the treatment of bipolar disorder, and its therapeutic range is narrow; therefore, toxicity can develop with even slight increases in dosage or changes in kidney function, sodium levels, or fluid intake.

When lithium becomes toxic, it can affect multiple systems in the body, particularly the cardiovascular and nervous systems. Tachycardia, or an increased heart rate, can be a response to the physiological stress that lithium toxicity creates, signaling that the body is reacting to the elevated lithium levels.

The other symptoms mentioned, while they may occur in various mental health conditions or other types of toxicity, are not specific indicators of lithium toxicity. Panic attacks are generally associated with anxiety disorders, excessive sweating could be part of various conditions or reactions, and hallucinations are often seen in severe cases of psychiatric disorders and may not directly relate to lithium toxicity. In contrast, tachycardia stands out as a direct physiological manifestation of the toxic effects that lithium can exert on the cardiovascular system.