PHARMACY CALCULATIONS

Convert 0.4% to a ratio strength.

0.4% is the same as 0.4 out of 100. Therefore, if we divide 100 by 0.4, we find ratio strenght of 1:250

How many milliliters of sodium chloride should be dispensed if a TPN order is made for 80 milliequivalents of NaCI & each stock vial contains 4mEq/mL.

20mL is required because each vial contains 4mEq. 20 x 4 = 80 milliequivalents of sodium chloride.

What is the percentage strength of a 120-gram ointment that contains 8000mg of active ingredient?

First, note that units are inconsistent. 8,000mg is the same as 8 grams of active ingredient. (8 grams of active ingredient / 120 gram ointment) x 100 = 6.6% percentage strength.

A pharmacy balance retails at $49.99 but costs the pharmacy $28.79 per piece. What is the mark - up percentage value?

First, we find the difference between both costs. $49.99 - $28.79 = $21.20 Now, we take that value & dived it by the cost & x 100. ($21.20 / $28.79) x 100 = 73.6% mark - up.

How many grams of dextrose can be found in 500mL of D50W?

First, we need to identify what D50W is 50 grams of dextrose in 100mL of water. We have 500mL of water, therefore there is 250grams of dextrose.

How many days supply of medicine does a patient have if they are given the following prescription: Amoxicillin 250mg, i cap po bid, dispense 28?

One capsule taken twice daily is 2 capsules per day. The patient is "dispensed 28", meaning that the patient has 14-days-worth of supply.

A pharmacy technician receives a prescription for carboplatin 50mg/m2 per dose. If the BSA of the patient is 1.4m2, how many milligrams of carboplatin are needed to satisfy the prescrption?

The drug is dosed as 50mg per square meter of patient. The patient is more than 1 square meter; they are 1.4 square meters. Therefore, we simply multiply 50 x 1.4 = 70mg of drug needed for a 1.4 square meter patient.

A patient is taking 10mL three times daily of amoxicillin 200mg/5mL. How much amoxicillin is the patient taking each day?

The patient is taking 10mL three - times - daily = 30mL per day There is 200mg in every 5mL, meaning that there is 1,200mg in 30mL. The patient is taking 1,200mg of amoxicillin daily.

Nexium retails in your local pharmacy for $8.90 per pack. Wholesale, the cost of Nexium is $5.49. The dispensing cost of selling Nexium is $1.10. What is the net profit for the pharmacy for each sale of one pack of Nexium?

The pharmacy sells each Nexium pack for $8.90. The pharmacy buys in each pack from the wholesaler for $5.49. $8.90 - $5.49 = $3.41 However, the pharmacy is charged a dispensing fee of $1.10, therefore we must subtract this, too, to establish the net profit. $3.41 - $1.10 = $2.31 net profit after all costs.

A surgeon prescribes 1.2-liters of intravenous fluid to be administered to a patient over a 6-hour period. What is the flow rate administered to the patient in mL/min?

The question asks us to deliver the answer in mL/min, however, the IV fluid value is given to us as liters & the time in hours. We must first correct this. 1.2-liters = 1,200mL & 6 hours = 360 minutes 1,200mL / 360 minutes = 3.3mL/min flow rate administered to the patient.

A pharmacy technician has prepared an 8 milliliter vial. How many 0.4mL does can be taken from this vial & administered to the patient?

The vial contains 8 milliliters & each dose contains 0.4ml. Therefore, if we divide 8/0.4, we learn that there are 20 doses in the 8mL vial.

How many milligrams in 3.25 grams?

There are 1,000 milligrams in 1 gram, so we must multiply 3.25 grams x 1,000 to give us 3,250mg.

If a patient receives 160mL/hr of drug from an IV bag that contains 2L, approximately how many hours will the IV bag last?

There are 2,000mL of solution in the IV bag. The patient is receiving 160mL per hour. When we divide 2,000/160mL per hour, we find that the IV bag will last 12.5 hours if used continuously.

Convert 48 pounds to kilograms.

There are 2.2 pounds in 1 kilogram. Therefore, we divide 48 pounds / 2.2 = 21.8kg

How many milliliters are found in 14 fluid ounces?

There are 30mL in 1 ounce. Therefore, 14 ounces contain (14 x 30mL) = 420mL

How many milligrams can be found in 5 grains?

There are 65mg in 1 grain. Therefore, 5 grains contains 325mg.

Calculate the Body Surface Area (BSA) of a patient who weighs 31.7kg & who stands at 60.6cm?

To calculate BSA, we need to take the square root of (height in cm x weight in kg) / 3,600. (60.6 x 31.7) = 1,921.02 / 3,600 = 0.5336 Now, we must take the square root of 0.5336 = 0.73 meters squared

Convert 1:7,500 to a percentage strength.

To calculate percentage strength when given a ratio, simply divide the ratio out & multiply by 100 to find the percentage. 1 / 7,500 = 0.00013 x 100 = 0.013%

Convert 23 degrees Celsius to degrees Fahrenheit.

To covert Celsius to Fahrenheit, we multiply by 9/5 and + 32. 23 degrees Celsius x 9 = 207 / 5 = 41.4 + 32 = 73.4 degrees Fahrenheit

What is the percentage strength of a solution of 1.2 grams of sucrose dissolved in 75mL of solution?

To find the percentage strength, we must do a simple division calculation, & multiply the resulting value by 100. 1.2 grams divided by 75mL = 0.016 x 1.6%