IV medication calculation formulas Strength Required X

IV medication calculation formulas Strength Required X Stock Strength Volume Stock Strength To find volume (in mls): Volume (ml) = Rate (ml/ hr) x Time (hrs) To find fluid completion time (in hrs): Time (hrs) = Volume(ml) Rate (ml/hr) To find rate (in ml/hr): Rate (ml/ hr) = Volume (ml) Time (hrs) To find rate (in ml/hr) – When the infusion time has been ordered in minutes: Rate (ml/hr) = Volume (ml) x 60 (mins) Time (mins) To find rate (in drops/min): Rate (drops/min) = Volume (ml) x Drops (per ml) Time (hrs) x 60 (mins) To find rate (in drops/min): Rate (drops/min) = Volume (ml) x Drops (per ml) Time (mins) x 1 To find final concentration (in mg/ml) – the amount of medication in 1ml: Final Concentration (mg/ml) = Stock Strength (mg) Volume of stock solution (ml) To find the amount of medication in a given volume: Dosage (mg) = Volume (ml) x Final concentration (mg/ml) To find the amount of medication received per hour: Hourly dosage (mg/hr) = Rate (ml/hr) x Final concentration (mg/ml) To find the total medication required in a single dose using body weight: Total medication required per dose (mg) = Ordered dose (mg/kg) x Patient’s weight (kg) Questions Q1. A post-op patient is ordered Ceftriaxone 1g IV to be administered daily. It is to be diluted in a total volume of 10mL of water for injection. A. Calculate the final concentration (mg/ml) of the Ceftriaxone/ water solution. B. At what rate (ml/hr) will you set an infusion pump if the drug is to be administered in 50mL of fluid over 45 minutes? C. At what rate (drops/min) will you deliver the drug if it is to be administered in 50mL of fluid over 45 minutes? (Drop factor 20 drops/ml) Q2. Metronidazole (500mg/100ml) TDS is ordered for a patient at a rate of 25mg/min A. Calculate the time it should take to administer this medication. B. Using a drop factor of 20 drops/ml and the time you calculated in the question above, how many drops/min would you deliver this medication C. Using a drop factor of 60 drops/ml and the time you calculated in the question above, how many drops/min would you deliver this medication over? Q3. Doctor’s order: Give a medication on the drug chart intravenously for a child weighing 20kg at a dosage of 50 mg/kg/day every 6/24. How many mg would each dose come in? Q4. A patient is ordered 500ml of normal saline. If an infusion pump is running at 25ml/hr how long will it take to deliver 500mls? Q5. Calculate the rate (ml/hr) for the following orders: (Give answers in the nearest whole number) A. 1L Normal Saline over 8 hrs B. 500ml of Dextrose 5% over 12 hrs C. 1L Hartmann’s over 12 hrs D. 1L Normal Saline over 24 hrs Q6. Calculate the required drip rate in drops/min for the following orders: (Give answers in the nearest whole number) A. An infant is ordered 150ml of fluid to run over 6 hours using a microdrip (60 drops/ml) set. B. 1L of fluid over 8 hours using a macrodrip (20 drops/ml) set. C. 1L of fluid over 10 hours using a macrodrip (20 drops/ml) set. D. 1L of fluid over 12 hours using a macrodrip (20 drops/ml) set. E. e) 1L of fluid over 16 hours using a macrodrip (20 drops/ml) set Q7. A patient is to receive 1L Hartmann’s over 12 hours and the drip set delivers 15 drops per ml. Calculate the rate in drops/min.

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