Clinical Medication Dosage Calculation Practice Problems
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Medication Dosage Calculation Exercises
Pethidine Dosage
Order: Pethidine 50 mg/ml, 15 mg i.v.
Calculation: How many ml does the patient receive? 0.3 ml
IV Infusion Rate Calculation
Order: 150 ml medical solution containing 100 mg of substance. Infusion must be administered over 40 minutes.
Calculation: What is the transfer speed in ml/min and gtt/min (drip factor 20 gtt/ml)? 3.75 ml/min = 75 gtt/min
Formula: (volume(ml) / time(min)) × drop factor (gtt/ml) = flow rate (gtt/min)
Cytotoxic Dosage Calculation
Order: Taxol® for ovarian cancer at 175 mg/m². Patient height 160 cm, weight 60 kg (BSA = 1.65 m²).
Calculation: How much effective medication will the patient receive? 288.75 mg
Atropine Injection
Order: Atropine 0.4 mg s.c. (Available: 1 mg/ml).
Calculation: How many ml will you inject? 0.4 ml
Prophylactic Medication
Order: Metronidazole 2 g p.o. (Tablet: 400 mg).
Calculation: How many tablets will you give? 5 tablets
Pethidine IM Injection
Order: Pethidine 50 mg/ml, 75 mg i.m.
Calculation: How many ml do you inject? 1.5 ml
Oxanest Dosage
Order: Oxanest 10 mg/ml, 8 mg i.m.
Calculation: How many ml will the patient receive? 0.8 ml
Potassium Chloride Dilution
Order: Potassium chloride 20 mmol. (Available: 20 ml vial, 2 mmol/ml).
Calculation: How many ml will you draw into the syringe? 10 ml
Sodium Concentrate Calculation
Order: Sodium concentrate 60 mmol. (Available: 20 ml vial, 4 mmol/ml).
Calculation: How much concentrate will you take? 15 ml
Cytotoxic Infusion and Speed
Order: Paraplatin® 400 mg (Available: 10 mg/ml). Dilute to 500 ml saline. Infuse over 1 hour.
Calculation: How much medication from the vial? 40 ml. What is the transfer speed (ml/min and gtt/min)? 8.33 ml/min = 166.6 gtt/min
Infusion Fluid Calculation
Order: 1200 ml infusion fluid (20 gtt/1ml) over 4 hours.
Calculation: What is the transfer speed in ml/min and gtt/min? 5 ml/min = 100 gtt/min
Morphine Dosage
Order: Morphine 20 mg/ml, 6 mg dose.
Calculation: How many ml will you give? 0.3 ml
Thyroxine Tablet Calculation
Order: Thyroxine 0.1 mg. (Available: 25 µg per tablet).
Calculation: How many tablets? 4 tablets
Pediatric Stesolid Dosage
Order: Stesolid 5 mg/ml. Dose: 0.1 mg/kg i.v. Child weight: 20 kg.
Calculation: How much in mg? 2 mg. How much in ml? 0.4 ml
Morphine 2% Dosage
Order: Morphine 2% solution, 4 mg i.v.
Calculation: How much medication will you give? 0.2 ml