Dosage Calculations Demystified: 100 Practice Questions With

Dosage Calculations Demystified: 100 Practice Questions with Step-by-Step Rationales for Nursing StudentsQuestion 1 How many milligrams are in 2.5 grams? Answer: 2500 mg Rationale: To convert grams to milligrams, multiply by 1000 (since 1 g = 1000 mg). 2.5g1000mg1g=2500mg Question 2 A patient is ordered 0.75 g of a medication. The available tablets are 250 mg each. How many tablets should be given? Answer: 3 tablets Rationale: First convert 0.75 g to mg: 0.751000=750mg. Then divide by 250 mg/tablet: 750250=3 tablets. Question 3 The physician orders 500 mg of amoxicillin. The pharmacy supplies amoxicillin 250 mg capsules. How many capsules should the patient take? Answer: 2 capsules Rationale: 500mg1capsule250mg=2 capsules. Question 4 An IV order is for 1000 mL of D5W to infuse over 8 hours. What is the flow rate in mL/hr? Answer: 125 mL/hr Rationale: Divide total volume by total hours: 1000mL8hr=125mL/hr. Question 5 The order is for 300 mg of a drug IM. The vial reads 150 mg/mL. How many mL will you administer?Answer: 2 mL Rationale: 300mg1mL150mg=2mL. Question 6 A medication is available as 50 mg/5 mL. The order is for 75 mg. How many mL should be given? Answer: 7.5 mL Rationale: First find concentration