A client prescribed lithium carbonate 300 mg twice daily a month ago comes to the Emergency Department with mental confusion, frequent urination in large amounts, and coarse tremors. Which lithium level would the nurse expect?

Choice A Reason: 0.8 mEq/L

The therapeutic range for lithium is typically between 0.6 and 1.2 mEq/L. A level of 0.8 mEq/L falls within this range and is considered normal. Therefore, it is unlikely that a client with this lithium level would present with symptoms such as mental confusion, frequent urination, and coarse tremors. These symptoms are more indicative of lithium toxicity, which occurs at higher levels.

Choice B Reason: 2.3 mEq/L

A lithium level of 2.3 mEq/L is significantly above the therapeutic range and indicates lithium toxicity. Symptoms of lithium toxicity include mental confusion, frequent urination, and coarse tremors, which match the client’s presentation. Severe toxicity can occur at levels above 2.0 mEq/L and can be life-threatening if not treated promptly. Therefore, this is the most likely lithium level for the client described.

Choice C Reason: 1.8 mEq/L

A lithium level of 1.8 mEq/L is above the therapeutic range but below the level typically associated with severe toxicity. While some symptoms of toxicity might appear at this level, they are generally less severe than those described in the scenario. The client’s symptoms suggest a more severe level of toxicity, making this choice less likely.

Choice D Reason: 1.2 mEq/L

A lithium level of 1.2 mEq/L is at the upper limit of the therapeutic range. While it is possible for some mild side effects to occur at this level, the severe symptoms described (mental confusion, frequent urination, and coarse tremors) are more indicative of a higher, toxic level of lithium. Therefore, this choice is also less likely.

The correct answer is d. Restrict your child’s intake of caffeine while she is taking this medication.

Choice A Reason:

This statement is incorrect. Methylphenidate does not typically increase saliva production. In fact, it is more commonly associated with dry mouth as a side effect. Therefore, informing parents that the medication might increase saliva production would be misleading and not based on the known side effects of the drug.

Choice B Reason:

This statement is incorrect. Methylphenidate should generally be administered in the morning or early afternoon to avoid insomnia, as it is a stimulant and can interfere with sleep if taken too late in the day. Administering the medication at bedtime would likely cause sleep disturbances, which is counterproductive for managing ADHD symptoms.

Choice C Reason:

This statement is incorrect. Methylphenidate is more commonly associated with weight loss rather than weight gain. The medication can suppress appetite, leading to reduced food intake and potential weight loss. Therefore, it is important to monitor the child’s weight and nutritional intake while on the medication, but weight gain is not a typical concern.

Choice D Reason:

This statement is correct. Caffeine is a stimulant and can exacerbate the side effects of methylphenidate, such as increased heart rate, jitteriness, and anxiety. Therefore, it is advisable to restrict the child’s intake of caffeine while taking this medication to avoid these potential interactions and side effects. This includes limiting consumption of caffeinated beverages like coffee, tea, and certain sodas.