A patient on lithium therapy presents to the emergency department. When should you hold the lithium medication and notify the healthcare provider?

Choice A reason: A lithium level of 0.9 mEq/L is within the therapeutic range (0.6–1.2 mEq/L). This does not require holding the medication. Choice B reason: Dry mouth and increased thirst are common side effects of lithium due to its mild diuretic effect. These do not indicate toxicity and do not require holding the medication. Choice C reason: Mild hand tremors are a common side effect of lithium and are not usually dangerous. They can be managed but do not warrant stopping the medication. Choice D reason: Nausea, vomiting, diarrhea, and coarse tremors are signs of lithium toxicity. These symptoms indicate dangerous accumulation of lithium in the body, requiring immediate discontinuation and notification of the healthcare provider.