Essential Drug Dosage Calculations Quiz

1. A patient has been taking 0.5g tablets of acetaminophen (Tylenol) P.O. for postoperative pain after an inguinal hernia repair. If the patient took a total of 1,500 mg in 72 hours, how many 0.5-g tablets were taken?

4 tablets

0.5g: 1 tab :: 1.5g : X tab= 3 tabletsP. 182

2 tablets

1 tablet

The patient took a total of 1,500mg of acetaminophen in 72 hours. Since each tablet is 0.5g (500mg), to find the number of tablets taken, we set up a proportion: 0.5g : 1 tab :: 1.5g : X tab. Cross multiplying, we get 0.5 * X = 1 * 1.5 which simplifies to X = 1.5 / 0.5 = 3. Therefore, the patient took 3 tablets in total.

Explanation

The patient took a total of 1,500mg of acetaminophen in 72 hours. Since each tablet is 0.5g (500mg), to find the number of tablets taken, we set up a proportion: 0.5g : 1 tab :: 1.5g : X tab. Cross multiplying, we get 0.5 * X = 1 * 1.5 which simplifies to X = 1.5 / 0.5 = 3. Therefore, the patient took 3 tablets in total.

2. The doctor's order reads glyburide 1.5 mg 3 tablets P.O. daily. What's the total dose in milligrams?

X = 4.5 mg

X = 5.5 mg

X = 3.5 mg

X = 2.5 mg

To calculate the total dose, you need to multiply the individual dose (1.5 mg) by the number of tablets (3). Therefore, 1.5 mg * 3 = 4.5 mg.

Explanation

To calculate the total dose, you need to multiply the individual dose (1.5 mg) by the number of tablets (3). Therefore, 1.5 mg * 3 = 4.5 mg.

3. The doctor orders 0.05 mg Synthroid P.O., but the only Synthroid on hand is in tablets that contain 0.025 mg each. How many tablets should you give?

1 tablet

1 tablet X 0.05mg = 0.05 mg X x x= 2 tabletsP. 178

3 tablets

4 tablets

To determine how many tablets are needed, you can set up the equation: 1 tablet x 0.05mg = 0.05mg x number of tablets. Solving for x, we get 2 tablets. Therefore, 2 tablets should be given to meet the prescribed dosage.

Explanation

To determine how many tablets are needed, you can set up the equation: 1 tablet x 0.05mg = 0.05mg x number of tablets. Solving for x, we get 2 tablets. Therefore, 2 tablets should be given to meet the prescribed dosage.

4. Your patient is receiving 500 mg of cefaclor oral suspension. The label reads cefaclor 250mg/5ml, and the bottle contains 100ml. How many milliliters of cefaclor should you give?

5 ml

15 ml

X X 250 mg = 5 ml X 500 mgX= 10 ml

25 ml

To calculate the required amount of cefaclor, you can set up a proportion. The patient needs 500 mg, and each 5 ml contains 250 mg. Cross multiply to find x, which equals 10 ml.

Explanation

To calculate the required amount of cefaclor, you can set up a proportion. The patient needs 500 mg, and each 5 ml contains 250 mg. Cross multiply to find x, which equals 10 ml.

5. The doctor orders 0.125 mg of digoxin (Lanoxin) elixir for a patient developing heart failure and pulmonary edema. The bottle is labeled 0.05 mg/ml. How many milliliters should the nurse administer?

0.05 mgX xml = 0.125 mg X 1mlx = 2.5 ml

1.5 ml

3 ml

4 ml

To calculate the amount of ml needed for 0.125 mg of digoxin, we set up a ratio using the information from the bottle label: 0.05 mg/ml = 0.125 mg/x ml. Cross-multiplying gives 0.05 mg x ml = 0.125 mg x 1 ml. Solving for x, we get x = 2.5 ml.

Explanation

To calculate the amount of ml needed for 0.125 mg of digoxin, we set up a ratio using the information from the bottle label: 0.05 mg/ml = 0.125 mg/x ml. Cross-multiplying gives 0.05 mg x ml = 0.125 mg x 1 ml. Solving for x, we get x = 2.5 ml.

6. Your patient needs 400 mg of erythromycin oral suspension. the label reads erythromycin 200 mg/ 5 ml. How many milliliters should you give?

X X 200mg = 5 ml X 400 mg x= 10ml

20 ml

15 ml

5 ml

To calculate the amount of oral suspension needed, use the formula x X 200mg = 5 ml X 400 mg. So, x=10ml.

Explanation

To calculate the amount of oral suspension needed, use the formula x X 200mg = 5 ml X 400 mg. So, x=10ml.

7. The doctor orders 100 mg Dilantin oral suspension t.i.d. for your patient. The label reads Dilantin 125 mg/5ml. How many mililiters should you give?

3ml

6ml

2.5ml

100 mg X 5 ml = 125 mg X x x= 4ml

To solve for x in the equation 100 mg x 5 ml = 125 mg x, you would multiply 100 mg by 5 ml and divide by 125 mg to find that x equals 4 ml.

Explanation

To solve for x in the equation 100 mg x 5 ml = 125 mg x, you would multiply 100 mg by 5 ml and divide by 125 mg to find that x equals 4 ml.

8. A doctor orders 25 g of lactulose (Cephulac) for a patient entering a prehepatic coma. The bottle is labeled 10 g/15ml. How many milliliters should the patient receive?

30 ml

40 ml

10 g X xml = 15 ml X 25g X= 37.5

45 ml

To calculate the answer, use the formula: 10g X xml = 15ml X 25g. Solving for 'xml', we get 37.5 ml.

Explanation

To calculate the answer, use the formula: 10g X xml = 15ml X 25g. Solving for 'xml', we get 37.5 ml.

9. Your patients's order reads aspirin gr 10 P.O. daily, but the unit-dose package says aspirin 325 mg. How many tablets should you administer daily?

1 tablet

4 tablets

3 tablets

To calculate the number of tablets needed, you convert grains to milligrams and then divide the total milligrams by the milligrams per tablet to get the number of tablets needed. In this case, 60mg X 10 grains = 600mg total. Since each tablet is 325mg, you would need approximately 1.846 tablets which can be rounded up to 2 tablets.

Explanation

To calculate the number of tablets needed, you convert grains to milligrams and then divide the total milligrams by the milligrams per tablet to get the number of tablets needed. In this case, 60mg X 10 grains = 600mg total. Since each tablet is 325mg, you would need approximately 1.846 tablets which can be rounded up to 2 tablets.

10. A prescription reads phenobarbital gr 1/4 to be taken gr 1/2 t.i.d. P.O. daily. How many milligrams of phenobarbital should this patient receive?

15 mg

60 mg

45 mg

To convert from grains to milligrams, you multiply by 60 since 1 grain is equivalent to 60 mg. Therefore, the correct calculation would be 60 mg x 1/4 = X x 1/2, which gives X = 15 mg x 2 = 30 mg.

Explanation

To convert from grains to milligrams, you multiply by 60 since 1 grain is equivalent to 60 mg. Therefore, the correct calculation would be 60 mg x 1/4 = X x 1/2, which gives X = 15 mg x 2 = 30 mg.

11. Your patient receives a prescription for 62.5 mcg of digoxin elixir P.O. daily. The elixir reads 0.05 mg/ml. How many milliliters of digoxin should you give?

1.50

X x 0.05 mg = 1 ml x 0.0625 X= 1.25

0.25

0.75

To calculate the amount of digoxin in milliliters, multiply the prescription dose (62.5 mcg) by the concentration of the elixir (0.05 mg/ml) and then divide by the total daily dose prescribed (1.25 mg). This will give you the quantity of digoxin in milliliters needed to administer.

Explanation

To calculate the amount of digoxin in milliliters, multiply the prescription dose (62.5 mcg) by the concentration of the elixir (0.05 mg/ml) and then divide by the total daily dose prescribed (1.25 mg). This will give you the quantity of digoxin in milliliters needed to administer.

12. A patient is to receive 0.25 mg of Synthroid. The medication is only available in tablets that contain 125mcg each. How many tablets should the nurse administer?

X = 2 tabletsP. 193

X = 4 tablets

X = 3 tablets

X = 1 tablets

To calculate the number of tablets needed, divide the total dosage required (0.25 mg) by the dosage per tablet (125 mcg): 0.25 / 0.125 = 2 tablets.

Explanation

To calculate the number of tablets needed, divide the total dosage required (0.25 mg) by the dosage per tablet (125 mcg): 0.25 / 0.125 = 2 tablets.