NAPLEX Calculation Practice (Part-1)

How many chloramphenicol capsules, each containing 250 mg, are needed to provide 25 mg/kg/d for 7 days for a person weighing 200 lb?

If a vitamin solution contains 0.5 mg of fluoride ion in each milliliter, then how many milligrams of fluoride ion would be provided by a dropper that delivers 0.6 mL?

What flow rate (drops per minute) should be used to infuse all 250 mL of the vancomycin hydrochloride solution in 2 hrs?

If 120 mL of a 10% stock solution is diluted to 240 mL, what is the final concentration?

How many milligrams of dextromethorphan base (molecular weight = 271.4) are equivalent to 10 mg of dextromethorphan hydrobromide (molecular weight = 352.3)?

If 240 mL of a cough syrup contains 480 mg of dextromethorphan hydrobromide, then what mass of drug is contained in a child’s dose, 1 teaspoon (5 mL) of syrup?

How many milliliters of a 1:1500 solution can be made by dissolving 4.8 g of cetylpyridinium chloride in water?

Syrup is an 85% w/v solution of sucrose in water. It has a density of 1.313 g/mL. How many milliliters of water should be used to make 125 mL of syrup?

How many milliliters of a 0.9% aqueous solution can be made from 20.0 g of sodium chloride?

In 25.0 mL of a solution for injection, there are 4.00 mg of the drug. If the dose to be administered to a patient is 200 µg, what quantity (in mL) of this solution should be used?

If 54.96 mL of an oil weighs 52.78 g, what is the specific gravity of the oil?

A 50 mL pycnometer is found to weigh 120 g when empty, 171 g when filled with water, and 160 g when filled with an unknown liquid. Calculate the specific gravity of the unknown liquid.

A glass plummet weighs 12.64 g in air, 8.57 g when immersed in water, and 9.12 g when immersed in an oil. Calculate the specific gravity of the oil.

What is the weight, in grams, of 3620 mL of alcohol with a specific gravity of 0.820?

What is the percent compliance rate if a patient received a 30-day supply of medicine and returned in 45 days for a refill?

A prescription calls for 800 milligrams of a substance. After weighing this amount on a balance, the pharmacist decides to check by weighing it again on a more sensitive balance, which registers only 750 milligrams. Because the first weighing was 50 milligrams short of the desired amount, what was the percentage of error?

When the maximum potential error is 4 milligrams in a total of 100 milligrams, what is the percentage of error?

Using a graduated cylinder, a pharmacist measured 30 milliliters of a liquid. On subsequent examination, using a narrow-gauge burette, it was determined that the pharmacist had actually measured 32 milliliters. What was the percentage of error in the original measurement?

If 10 pints of a 5% solution are diluted to 40 pints, what is the percentage strength of the dilution?

If 30 milliliters (mL) represent 1⁄6 of the volume of a prescription, how many milliliters will represent 1⁄4 of the volume?

If 3 tablets contain 975 milligrams of aspirin, how many milligrams should be contained in 12 tablets?

If a child’s dose of a cough syrup is 3⁄4 teaspoonful and represents 1⁄4 of the adult dose, calculate the corresponding adult dose.

If the adult dose of a medication is 2 tea spoonsful (tsp.), calculate the dose for a child if it is 1⁄4 of the adult dose?

A pharmacist prepares 1 gal of KCl solution by mixing 565 g of KCl (valence = 1) in an appropriate vehicle. How many milliequivalents of K+ are in 15 mL of this solution? (atomic weights: K = 39; Cl = 35.5)

A vancomycin solution containing 1000 mg of vancomycin hydrochloride diluted to 250 mL with D5W is to be infused at a constant rate with an infusion pump in 2 hrs. What is the rate of drug administration?