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Dosage calculation lessons
Every problem type explained from the ground up — the formula, the setup as dimensional analysis, worked examples, and the mistakes to avoid. All free.
Oral tabletsOral tablet dosage calculationLearn to calculate how many tablets to give with the D/H × Q formula, step by step, with worked dosage calculation practice problems and answers.Tablets = (Desired dose ÷ dose On hand) × Quantity per tabletOral liquidsOral liquid (suspension) dosage calculationCalculate how many milliliters of an oral suspension to give using D/H × Q, with worked nursing dosage practice problems and step-by-step answers.Volume (mL) = (Desired dose ÷ dose On hand) × Quantity (mL)IV drip rate (gtt/min)IV drip rate calculation (gtt/min)Calculate a gravity IV drip rate in gtt/min using the drop-factor formula. Worked practice problems with 10, 15, 20, and 60 gtt/mL tubing.gtt/min = (Volume mL ÷ Time min) × Drop factor (gtt/mL)IV flow rate (mL/hr)IV flow rate calculation (mL/hr)Set an IV pump rate in mL/hr by dividing volume by time in hours. Step-by-step nursing dosage practice problems with answers.mL/hr = Volume (mL) ÷ Time (hr)IV infusion timeIV infusion time calculationWork out how long an IV will take by dividing volume by rate, then converting decimal hours to hours and minutes. Practice problems with answers.Time (hr) = Volume (mL) ÷ Rate (mL/hr)Weight-based (mg/kg)Weight-based dosage calculation (mg/kg)Calculate weight-based and pediatric doses in mg/kg, including lb-to-kg conversion and dividing a daily dose into equal doses. Worked practice problems.Dose = Weight (kg) × ordered mg/kg (÷ doses per day if divided)ReconstitutionReconstitution dosage calculationCalculate the volume to draw from a reconstituted powdered drug vial using ordered dose ÷ concentration. Step-by-step practice problems with answers.Volume (mL) = Ordered dose (mg) ÷ Concentration after mixing (mg/mL)Weight-based IV infusionWeight-based IV infusion (mcg/kg/min to mL/hr)Convert an ordered mcg/kg/min infusion into a pump rate in mL/hr using multi-step dimensional analysis. Worked critical-care practice problems.mL/hr = (ordered mcg/kg/min × weight kg × 60) ÷ concentration (mcg/mL)