Pharmacology Math Flashcards

Questions and Answers

What are dosage calculations?

For the order of amoxicillin 500 mg PO Q 8hrs with available 250 mg tablets, how many tablets will you give?

2 tablets

For the order of acetaminophen 500 mg PO Q6hrs with available acetaminophen 325 mg/tab, how many tablets will you round to?

1.5 tablets

For the order of Levothyroxine 0.1 mg PO Q AM with available Levothyroxine 200 mcg/tab, how many tablets will you give rounded to the nearest half tablet?

0.5 tablet Signup and view all the answers

For the order of acetaminophen 10 mg/kg PO Q6hrs for a child weighing 42 lbs, how many mg per dose will you give? Round to the nearest whole number.

191 mg/dose Signup and view all the answers

For the order of 191 mg with available Elixir 160 mg/5 mL, how many mL per dose will you provide rounded to the nearest whole number?

6 mL/dose Signup and view all the answers

For the order of 1L of NS in 4 hrs, how many mL per hour will you set for the infusion pump?

250 mL/hr Signup and view all the answers

For the order of Vancomycin 500 mg in 250 mL IV Q12H infusing at 200 mg/hr, what mL/hr will you set the pump?

100 mL/hr Signup and view all the answers

For the order of Heparin 18 units/kg/hr with a patient weight of 72 kg, how many units/hr should the patient receive?

1296 units/hr Signup and view all the answers

With Heparin infusing at 18 mL/hr and an IV bag containing Heparin 25,000 units in 250 mL, how many units/hr is the patient receiving?

1,800 units/hr Signup and view all the answers

For the order of 1296 units/hr with available Heparin 25,000 units in 100 mL, how many mL/hr will you set the pump rounded to the tenths place?

5.2 mL/hr Signup and view all the answers

For the order of NS at 125 mL/hr with IV tubing that has 20 gtts/mL, calculate the drops/min flow rate rounded to the whole number.

42 gtts/min Signup and view all the answers

If the nurse starts a 1000 mL bag of D5 ½ (0.45%) saline at 125 mL/hr, how many hours will it take for the bag to complete?

8 hrs Signup and view all the answers

For a client receiving 1 liter of 0.9% saline over 1 hour with a drop factor of 10 gtt/mL, calculate the drip rate per minute rounded to the nearest whole number.

167 gtts/min Signup and view all the answers

For an order of 200 mg methylprednisolone IV every 24 hours to be administered over 30 minutes with the label reading methylprednisolone 125 mg/2 mL, calculate the mL to administer per dose rounded to the tenths.

3.2 mL Signup and view all the answers

For an order of 1 mg/kg enoxaparin subcutaneously every 12 hours for a client weighing 202 pounds, calculate the number of mg(s) to administer per dose rounded to the nearest whole number.

92 mg Signup and view all the answers

For the order of 40 mg/kg/day amoxicillin divided BID for a client weighing 56 pounds, calculate how many mg to administer per dose rounded to the nearest whole number.

509 mg/dose Signup and view all the answers

For a client prescribed 12.5 mg of hydroxyzine with 25 mg tablets available, how many tablets will be administered?

0.5 tablet Signup and view all the answers

For a client prescribed 200 mg of acetaminophen with liquid acetaminophen containing 160 mg in 5 mL, how many mL should be administered rounded to the nearest tenth?

6.25 mL Signup and view all the answers

For a prescription of 8 mg of ondansetron, how many tablets with 4 mg tablets available should the patient receive?

2 tablets Signup and view all the answers

For a client weighing 75 kg prescribed 1 mg/kg enoxaparin every 12 hours, how many mg(s) will you administer?

75 mg Signup and view all the answers

For the order of 2000 mg of ceftriaxone IV every 24 hours, with the label reading 2g ceftriaxone in 50 mL, how many mL(s) should be administered?

50 mL Signup and view all the answers

Study Notes

Pharmacology Math Fundamentals

Dosage calculations are essential for accurate medication administration in healthcare.

Common Dosage Examples

Amoxicillin: 500 mg ordered; administer 2 tablets of 250 mg each.
Acetaminophen: 500 mg ordered; available in 325 mg/tablet, resulting in a requirement of 1.5 tablets.
Levothyroxine: 0.1 mg ordered; available as 200 mcg/tablet, equal to 0.5 tablets.
Child's Acetaminophen Dosage: For a child weighing 42 lbs, 10 mg/kg gives 191 mg per dose.

Liquid Measurements

For an order of 191 mg of acetaminophen with an elixir of 160 mg/5mL, administer 6 mL per dose.

Infusion Rates

Normal Saline (NS): Administer 1L in 4 hours translates to 250 mL/hr.
Vancomycin: Infusing 500 mg in 250 mL at 200 mg/hr requires a pump setting of 100 mL/hr.
Heparin: Administering 18 units/kg/hr for a patient weighing 72 kg results in 1296 units/hr.

Calculating Units and Rates

Heparin Infusion: At 18 mL/hr with a concentration of 25,000 units in 250 mL, the patient receives 1800 units/hr.
For an order of 1296 units/hr with Heparin 25,000 units in 100 mL, a pump setting of 5.2 mL/hr is needed.

Drop Rate Calculations

Administering NS at 125 mL/hr using IV tubing (20 gtts/mL) results in a flow rate of 42 gtts/min.
A client receiving 1L of 0.9% saline over 1 hour requires a drip rate of 167 gtts/min.

Methylprednisolone Administration

An order for 200 mg of methylprednisolone administered over 30 minutes requires 3.2 mL for each dose and an IV flow rate of 6.4 mL/hr.

Enoxaparin and Dosage Calculations

Weight-based dosing of enoxaparin: a patient weighing 202 lbs requires 92 mg each dose, which converts to 0.92 mL.
For a patient with a weight of 75 kg, administering 1 mg/kg of enoxaparin equates to 75 mg every 12 hours.

Specific Medication Doses

Amoxicillin for a child: A 40 mg/kg/day divided BID for a 56 lb child equals 509 mg/dose or 6.36 mL/dose (available as 400 mg/5 mL).
Administering 12.5 mg hydroxyzine with available 25 mg tablets requires 0.5 tablet.
A dose of 200 mg acetaminophen in liquid form (160 mg in 5 mL) equals 6.25 mL.
An order for ondansetron at 8 mg requires 2 tablets (available as 4 mg/tablet).
For a ceftriaxone order of 2000 mg IV, use a volume of 50 mL (2 g in 50 mL) for administration.

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Description

Test your knowledge on dosage calculations and medication orders with this Pharmacology Math Flashcards quiz. It covers key concepts such as dosage adjustments and available medication strengths, providing essential practice for healthcare professionals.