NursingSprint

Step 1: Convert the ordered dose from grams to milligrams

Formula:

mg = g × 1,000

Calculation:

3.9 g × 1,000 = 3,900 mg

Step 2: Divide the total daily dose by number of doses per day

Doses per day:

Every 12 hr = 2 doses/day

Calculation:

3,900 mg ÷ 2 = 1,950 mg per dose

Step 3: Use the formula to calculate number of tablets per dose

Formula:

Tablets = Dose per administration ÷ Tablet strength

Calculation:

Tablets = 1,950 ÷ 650 = 3 tablets

Step 4: Round the final answer to the nearest whole number

Rounded Tablets:

3 tablets

Final Answer:

3 tablets

Educational Insight

This calculation involves unit conversion, dose division, and tablet quantification—all of which are critical for accurate medication administration. Calcium carbonate is often prescribed in large doses and dividing it evenly ensures consistent absorption and therapeutic effect. By converting grams to milligrams, dividing the daily dose, and matching it to tablet strength, nurses ensure both the safety and efficacy of treatment. Rounding to the nearest whole number is essential when tablets cannot be split accurately.