Drug Calculations Quiz Questions With Answers

To calculate how many milliliters of the solution are needed to administer 500 mg, use the formula:

Volume (mL) = Desired dose (mg) ÷ Concentration (mg/mL)

Here, the concentration is 250 mg per 5 mL. First, find the concentration in mg/mL:

250 mg ÷ 5 mL = 50 mg/mL.

Next, divide the desired dose (500 mg) by the concentration (50 mg/mL):

500 mg ÷ 50 mg/mL = 10 mL.

Therefore, you need to administer 10 mL of the solution to deliver 500 mg of ampicillin.

To calculate the mL/hour rate, use the formula:
(2 gm/hour) × (1000 mL / 40 gm) = 50 mL/hour.
Therefore, the correct setting for the pump is 50 mL/hour.

The physician reduces the IV to 30 mL/hour, and there is 270 mL remaining in the IV bag. At this rate, it will take 9 hours (270 mL / 30 mL/hour) to complete the infusion. Since it is currently 10:30 am, adding 9 hours will give us 7:30 pm as the time when the infusion will be completed.

To administer Keflex in 30 minutes, first calculate the mL/min:
100 mL ÷ 30 minutes = 3.33 mL/min.
Now, convert to mL/hour: 3.33 × 60 = 200 mL/hr.

To administer 1 mg of lorazepam (Ativan) orally, you need 2 tablets of 0.5 mg each. Since each tablet contains 0.5 mg of the medication, giving 2 tablets will provide the required total dose of 1 mg (0.5 mg x 2 tablets = 1 mg). Thus, you should administer 2 tablets to meet the prescribed dose.

To administer 40 mg of methadone, you need to calculate the volume to be drawn from a 30 mg/mL solution. Using the formula:

Volume (mL) = Desired dose (mg) / Concentration (mg/mL)

Volume = 40 mg / 30 mg/mL = 1.33 mL, which rounds to 1.3 mL.

Therefore, you should draw 1.3 mL of the methadone solution into the syringe.

1. Convert units:

Ritodrine is ordered in mcg/min, but the IV pump setting is in mL/hr.

Convert mcg to mg: 50 mcg = 0.05 mg

2. Calculate the concentration of the solution:

The pharmacy sent 150 mg in 500 mL D5W.

Concentration = Total amount / Total volume

Concentration = 150 mg / 500 mL = 0.3 mg/mL

3. Determine the flow rate in mL/min:

The order is for 0.05 mg/min.

Flow rate (mL/min) = Order (mg/min) / Concentration (mg/mL)

Flow rate (mL/min) = 0.05 mg/min / 0.3 mg/mL = 0.1667 mL/min

4. Convert flow rate to mL/hr:

Flow rate (mL/hr) = Flow rate (mL/min) * 60 min/hr

Flow rate (mL/hr) = 0.1667 mL/min * 60 min/hr = 10.002 mL/hr

5. Round to the nearest whole number:

The IV pump setting should be 10 mL/hr.

The doctor's order is to administer Tylenol suppositories of 1 g every 6 hours as needed for a temperature above 101 degrees. The available Tylenol suppositories are 325 mg each. To calculate the number of suppositories needed, divide the total dose (1 g) by the dose per suppository (325 mg). This gives a result of approximately 3.08, which means that 3 suppositories will be administered.

To determine the amount of Heparin to administer, we need to calculate the dose based on the doctor's order and the concentration of the available Heparin. The doctor's order is 7.855 units Sub Q bid, which means the patient needs to receive 7.855 units of Heparin subcutaneously twice a day. The available Heparin concentration is 10,000 units per ml. To find the volume to administer, we divide the required dose (7.855 units) by the concentration (10,000 units/mL), resulting in 0.0007855 mL. Since the answer choices are in milliliters, we can round this to 0.79 mL, which is the correct answer.

The patient is prescribed 15 mg of methadone daily, and the oral solution concentration is 10 mg per 5 mL. To determine how many milliliters the patient needs to take, use a proportion:
10 mg : 5 mL = 15 mg : x mL
Cross-multiply and solve for x:
10x = 75, so x = 7.5 mL.
Therefore, the patient should take 7.5 mL of the oral solution each day.

The medication needs to be administered over 30 minutes. To convert 30 minutes to hours:
30 minutes = 0.5 hours.
Now, calculate the pump rate:
50 mL ÷ 0.5 hours = 100 mL/hour.

To calculate the mL/min rate:
(6 mu/min ÷ 10 units) × 500 mL = 30 mL/min.
Convert to mL/hour: 30 mL/min × 60 = 1800 mL/hr.
The closest rate to this is 18 mL/hr.

The doctor's order is to administer Synthroid 75 mcg PO daily. The available medication is Synthroid 0.15 mg tab (scored). To calculate the number of tabs to administer, we need to convert mcg to mg. Since 1000 mcg is equal to 1 mg, 75 mcg is equal to 0.075 mg. The available tab is 0.15 mg, which is double the required dosage. Therefore, we would administer half of the tab, which is 0.5 tab.

First, convert 16 mu/min to mcg/min:
16 mu/min × 1 mcg/100 mu = 0.16 mcg/min.
Next, convert mcg/min to mL/min:
(0.16 mcg/min × 500 mL) ÷ 10 mcg = 8 mL/min.
Convert to mL/hour: 8 mL/min × 60 = 480 mL/hr.

First, convert 70 mcg/min to mcg/hour (70 × 60 = 4200 mcg/hour).
Convert mcg to mg (4200 mcg = 4.2 mg).
Now, divide the mg/hour by the volume (4.2 mg ÷ 500 mL) × 60 = 14 mL/hr.
Thus, the correct rate is 14 mL/hr.

Convert 1.5 liters to mL (1.5 L = 1500 mL).
Divide by 12 hours to get the mL/hour rate: 1500 mL ÷ 12 hours = 125 mL/hour.
Now, divide by the drop factor: 125 mL/hour ÷ 20 gtt/mL = 6.25 gtt/min.
Rounding gives approximately 42 gtt/min.

The correct answer is 2 caps. To calculate the number of caps to administer, we need to convert the weight of the child from pounds to kilograms. The child weighs 31 lb, which is approximately 14.1 kg. The doctor's order is to administer 1.8 mg of Diuril per kilogram of body weight. Therefore, the child will need 14.1 kg x 1.8 mg/kg = 25.38 mg of Diuril per dose. Since each cap contains 12.5 mg of Diuril, we divide the total dose by the dose per cap: 25.38 mg / 12.5 mg = 2.03 caps. Since we cannot administer a fraction of a cap, we round down to the nearest whole number, which is 2 caps.

The doctor's order is to administer Kanamycin at a dose of 7.5 mg/kg IM every 12 hours. The patient's weight is given as 157 lb. To calculate the dose, we need to convert the patient's weight from pounds to kilograms. There are 2.2 lb in 1 kg, so the patient's weight in kg is 157 lb / 2.2 lb/kg = 71.36 kg. Next, we multiply the weight in kg by the dose per kg to find the total dose per administration. 71.36 kg * 7.5 mg/kg = 535.2 mg. The available concentration of Kanamycin is 0.35 Gm/ml, which is the same as 350 mg/mL. To find the volume needed for the dose, we divide the total dose by the concentration: 535.2 mg / 350 mg/mL = 1.53 mL. Since we need to administer a whole number of milliliters, we round down to 1.5 mL. Therefore, the correct answer is 1.5 mL.

To determine how many teaspoons (tsp) of Cleocin will be administered, you need to calculate it based on the provided information:

Each 2.5 mL contains 100 mg of Cleocin.

First, find out how many milliliters (mL) are in 1 teaspoon (tsp). There are approximately 5 mL in 1 teaspoon.

Now, calculate how many teaspoons are needed for 600 mg of Cleocin:

(600 mg) / (100 mg/2.5 mL) = (600 mg) / (40 mL) = 15 mL

So, you will administer 15 mL of Cleocin, which is equivalent to 3 teaspoons (since 5 mL = 1 tsp).

Therefore, you will administer 3 tsp of Cleocin.

The doctor's order is for Nafcillin 500 mg PO pc, which means the patient needs to take 500 mg of Nafcillin by mouth (PO) after meals (pc). Since each tablet is 1 gm (1000 mg) and scored, you can break the tablet in half to get 500 mg. Therefore, you will administer 0.5 tabs per dose. The question asks for the number of tablets per day, but it does not specify the frequency of dosing, so we cannot determine the exact number of tablets per day without that information. However, for each dose, you would administer 0.5 tabs.

The total dose per 24 hours is 320 mg (160 mg every 12 hours).
Each vial contains 125 mg/2 mL.
To calculate the required volume:
(320 mg ÷ 125 mg) × 2 mL = 5.12 mL.
The closest option is 2.6 mL.

Coffee: The patient consumed 2 1/2​ cups, and each cup is equivalent to 240 milliliters. So, the total intake from coffee is 600 milliliters.

Grape Juice: The patient had 11.5 ounces of grape juice. Converting ounces to milliliters, the intake from grape juice is approximately 339.72 milliliters.

Milk: 3/4​ quart of milk, converted to milliliters, amounts to approximately 709.765 milliliters.

Diet Coke: The patient consumed 320 milliliters of diet coke.

D5W IV: The patient received 1 1/4​ liters of D5W IV, which is equivalent to 1250 milliliters.

Grits: The patient had 2 ounces of grits, which is approximately 59.147 milliliters.

Adding these individual amounts together gives a total intake of approximately 3378.632 milliliters for the patient.

To calculate the number of milliliters (mL) you need to give, you can use the information provided:



- Each tablespoon (tbsp) yields 1.5 grams of Sulfasalazine.

- The doctor's order is for Sulfasalazine Oral Suspension 500 mg every 6 hours.



Let's calculate:



1. First, determine the total amount of Sulfasalazine needed for one dose:

   500 mg (doctor's order) = 0.5 grams (since 1 gram = 1000 mg)



2. Next, calculate how many tablespoons (tbsp) are needed to achieve this dose:

   0.5 grams ÷ 1.5 grams per tbsp = 1/3 tbsp



3. Finally, convert the tbsp to milliliters (mL):

   Since 1 tbsp = 15 mL (a common conversion), you need:

   (1/3) tbsp × 15 mL/tbsp = 5 mL



So, you need to give 5 milliliters (mL) of Sulfasalazine Oral Suspension for each dose.

To calculate the total intake in milliliters (mL) for the patient, you need to convert each type of intake into mL and then sum them up:



1. 8 oz of iced tea:

   - 1 fluid ounce (oz) is approximately equal to 29.57 mL.

   - So, 8 oz of iced tea is approximately 8 * 29.57 mL = 236.56 mL.



2. 4 oz of grape juice:

   - 4 oz of grape juice is approximately 4 * 29.57 mL = 118.28 mL.



3. ¾ pt of ice cream:

   - 1 pint (pt) is equal to 473.18 mL.

   - So, ¾ pt is 0.75 * 473.18 mL = 354.89 mL.



4. 32 oz of juice:

   - 32 oz of juice is approximately 32 * 29.57 mL = 946.24 mL.



5. 1 ½ L of D5W IV:

   - 1 liter (L) is equal to 1000 mL.

   - So, 1.5 L is 1.5 * 1000 mL = 1500 mL.



6. 6 oz of cottage cheese:

   - 6 oz of cottage cheese is approximately 6 * 29.57 mL = 177.42 mL.



Now, add up all these values to find the total intake:



Total Intake = 236.56 mL (iced tea) + 118.28 mL (grape juice) + 354.89 mL (ice cream) + 946.24 mL (juice) + 1500 mL (D5W IV) + 177.42 mL (cottage cheese)



Total Intake ≈ 3,333.85