Calculations

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**Abstract: **The reader is taken through the calculations for six problems. The first shows how to calculate the number of bolus doses that a patient should administer per hour for a morphine sulfate solution to be administered via an ambulatory patient-controlled analgesia pump, the maximum amount of morphine that the patient may receive daily, the minimum and maximum amount of time that the infusion will last and the number of bolus doses that the patient used during a specified time period. The second shows how to calculate the number of milliliters of diluent to add to a vial of methotrexate to produce a certain concentration of the drug. The third shows how to calculate the osmolarity of 500 mL of D5NS solution containing 10 mEq of potassium chloride. The fourth shows how to calculate the time to start the next container of lactated Ringers injection for a patient for whom an order has been written to decrease intravenous fluids to 65 mL per hour. The fifth shows how to calculate the concentration of phosphate and potassium in an injection of potassium phosphates injection containing 236 mg potassium phosphate, dibasic, and 224 mg potassium phosphate, monobasic, per milliliter. The sixth shows how to calculate the number of grams of acacia that should be added to 1.5 kg of tableting mixture to produce a concentration of 5% w/w.

**Related Keywords: **
Methotrexate, calculation for diluent added to, Morphine sulfate solution, calculation for administration of