Medication Calculations

Medication calculation competency is a foundational nursing skill that directly impacts patient safety. The desired-over-have multiplied by quantity (D/H x Q) method provides a systematic approach for determining the correct dose of oral, subcutaneous, and reconstituted medications. Unit conversions between metric measurements such as milligrams to micrograms (multiply by 1000), millilitres to litres (divide by 1000), and kilograms to pounds (multiply by 2.2) are essential prerequisites for accurate dosing. Safe dose range verification requires comparing the ordered dose against the recommended range in a drug reference, and documenting intake and output accurately supports ongoing assessment of fluid balance and renal function.