Effective lithium management is crucial for bipolar disorder care. With 600 mg tablets available, how many tablets should be given per dose? Do you know the answer? Let’s find out!

A patient newly diagnosed with bipolar disorder is prescribed lithium 900 mg/day PO divided into four separate doses.

Twelve hours after taking the first dose, the patient has a serum lithium blood level drawn, which results in a level of 0.4 mEq/L.

The patient’s dose is increased to 1200 mg/day divided into four separate doses. Lithium tablets are available in a 600 mg formulation.

How many tablet(s) should the nurse administer to the patient per dose?

  • Round to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.
  • Any rounding should be completed at the end of the calculation.
  • The answer must be numeric only. Do not add any units of measurement.

Scroll down for the answer!

DOSAGE CALCULATION
Rx Desired - Total Dosage/Day / # of doses/day
Desired = 1200 mg/day / 4 doses/day
X = Desired x Quantity/Have
X = 300 mg x 1 tablet/600 mg
X = .5 tablets
Answer: 0.5 tablets

Key Takeaways

  • Lithium dosing often requires dividing total daily dose into multiple administrations.
  • Tablet strength influences how many tablets are given per dose.
  • Blood lithium levels guide safe dose adjustments.
  • Accurate rounding is essential to avoid dosing errors.
  • Understanding dose calculation improves patient safety and treatment efficacy.

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