Dose
Doctor orders 50mg DrugA SC q8h x 14 d. Your pharmacy has 25mg/2mL ampoules. How many ampoule(s) is needed per dose?
1 ampoule = 50mg. Dose = 25mg. 2 ampoules per dose.
A physician orders 250mg DrugF po tid. If you dispense 900mL of the oral liquid version (25mg/mL), how many days will this last for the patient?
Dose = 250mg / 25mg = 10mL. Daily dose = 3 * 10mL = 30mL. 900mL / 30mL = 30 days.
What is the percentage strength if 750mg DrugL is in 0.5L of water?
750mg/0.5L = 0.75g/500mL = 0.15g/100mL. 0.15%
An IV of 500mL is running at 100mL/hr. How many hours will it last?
500mL/100mL = 5hrs
An IV is being administered at 75mL/hr. What is the gtt/min for a 15 gtt/mL tubing?
(75mL/hr) * 15 gtt/mL * 1hr/60min = 1125gtt/60min = 18.75 gtt/min = 19gtt/min
Doctor orders 25mg DrugB tid via IM x 3 d. Your pharmacy has 0.15g vial of DrugB. The instruction says add 2.9mL of SWI to make 5% strength. How many mL would a nurse use per dose?
5% strength = 5g/100mL = 5000mg/100mL = 50mg/mL. 1 dose = 25mg = 0.5 mL.
Doctor order 50mg DrugG, po iii tabs alternating with v tabs every other day, Mitte: 120 tabs. How many days would this last?
8 tablets per pair. 120 tabs * 8 tabs = 15 pairs of days. Therefore, 30 days in total.
You need to dispense 208 grams of “Warming Ointment”. Its composition is 2:4:10 ratio of DrugM, DrugN, Vaseline, respectively. How much DrugN is required for Rx?
DrugO is 4 parts in 16 = ¼ of composition. 208 * ¼ = 52g
NS 750mL will run from 800H to 1400H. How many mL of NS is remaining in the IV bag after 5 hours?
750mL – (750mL/6hr * 5hrs) = 125mL
An IV is running at 20gtt/min through a 15gtt/mL tubing. How many mL will be needed for 24 hours?
24hr = 60 * 24 = 1440 minutes. (1mL/15gtt) * (20gtt/min) * 1440min = 1920mL
A patient who cannot swallow pills visits your compounding pharmacy. Prescription says 25mL DrugC q12h prn, Mitte: 250mL. Knowing that DrugC is only dispensed at 125mg/5mL in strength, how many 500mg scored tablet(s) should you use to create the oral liquid solution?
Mitte: 250mL = ?mg. ? = 250mL * 125mg / 5mL = 6250mg.
Since 1 tab = 500mg, 6250mg = 6250 / 500 =12.5 tabs
ODB patient presents a prescription: 500mg DrugH x 60d, repeat x1. For the purpose of Trial Rx, you tell the patient you can either dispense 1 month (fully covered by ODB) or 3 months if they are willing to pay cash for the other 2-month supply. The patient chooses the first option. How many days would remain in the profile after the trial dispense?
Total authorized = 120 days. Trial Rx = 30d. 120 days – 30 days = 90 days remaining.
Doctor orders 25mg DrugO SC tid x 14d. Your pharmacy is currently out of 250mg/5mL injection pen that delivers 25mg per injection, and it’s on backorder from K&F supplier. You’ve decided to order a 250mg multi-use vial from McK supplier instead. The following instruction appears on the vial: tap to loosen the powder, add 1.55mL SWI, shake gently, then add 2.25mL SWI again to the concentration of 250mg/5mL. What is the powder volume of DrugO?
1.55 + 2.25 = 3.8mL SWI used. 5mL – 3.8mL = power volume = 1.2mL
You are a technician in St. Humber hospital. You sent two IV bags of DrugR 500mL to fulfill your daily cart at 3pm. If the patient must constantly receive DrugR at very slow pace, what is the rate in mL/min if 15gtt/mL tubing is used? (Assume no DrugR leftover)
1000mL / 24 hrs = 41.67mL/hr = 0.69mL/min
DrugT 0.4% 400mL is ordered to run at 20 gtts/min. How long will the bag last if a 20gtts/mL setting is used?
500mL * 20gtts/mL * 1min/20gtts = 400 minutes. = 6 hours and 40 minutes.
Doctor orders: 25mg DrugD, po ii tabs alternating with iv tabs every other day, Mitte: 30-day supply. How many tablet(s) should you dispense?
“Pair of days” supply = 2 + 4 = 6 tablets per pair.
30 days = 15 pairs. 15pairs * 6tab/pair = 90 tabs.
Prescription states: 125mcg DrugJ bid Monday, Wednesday, Friday. 100mcg DrugJ tid Tuesday, Thursday,Saturday. Skip dose on Sunday. Start treatment on Monday. If you dispensed 6.6mg, how many days would this last?
M,W,F = 125mcg/dose * 2 doses/day = 250mcg per day. T,R,S = 100mcg/dose * 3 doses/day = 300mcg per day. Sunday = 0 dose. Therefore, the weekly dose = 750 + 900 = 1650mcg. You dispensed 6.6mg, which is 6600mcg. Day Supply = 6600mcg / 1650 mcg = 4 weeks = 28 days
Doctor orders 250g of “Cooling Ointment”. To compound “Cooling Ointment”, the recipe book says to mix 0.775kg of DrugP with 0.325kg of Vaseline. How many grams of DrugP is required to dispense this order?
? : 250g :: 775g : 1100g. ? = 250g * 775g / 1100g = 176.14g.
At 10pm, 42-year old patient started receiving an IV bag of 1000mL D5W at a rate of 125mL/hr. What time will a nurse replace the bag?
1000mL /125mL = 8hours. 2200 + 0800 = 3000 = 600 at next day = 6AM next day
2000 mg of DrugU is dissolved in a 0.25L IV bag. The hospital has 20 gtts/mL and 60 gtts/mL drop sets available. If the microdrip setting was used to run at 15 drops per minute, how many hours and minutes will this bag last?
(1min/15gtt) * (60gtt/mL) * 250mL *(1hr/60min) = 16.66 hrs = 16 hours and 40 minutes.
You have a 33lbs patient who is unable to swallow any pills. Doctor orders 5-day treatment of 15mg/kg DrugE q8h. How many 25mL resuspension bottles of DrugE should you dispense if the strength is 125mg/5mL?
Weight = 33lbs / 2.2 = 15kg.
Dose = 15mg/kg * 15kg = 225mg. Daily dose = 225mg * 3 = 675mg. Total dispense = 675mg * 5 days = 3375mg.
Each bottle = 125mg/5mL * 25mL = 625mg. 3375mg/625mg = 5.4 = 6 bottles needed
You dispensed 3 multi-use vials of DrugK at Patient’s request. Each vial is labeled as 5mL 0.04%. Doctor ordered 50mcg SC od, Mitte: 12 months, Repeat: 0. How many refills (in vials) does this patient have?
0.04% = 0.04g/100mL = 40mg/100mL= 2mg/5mL. So, each vial has 2mg. Since daily dose is 50mcg, each vial is good for 40 days. 3 vials = 120 days = 4 months. So, this patient still has 8 months refills, which is 6 vials.
A patient requires 150mg DrugQ bid via IV x 30d. A multi-use vial label says ‘add 4.6mL of SWI to the strength of 62.5mg/mL’ – unfortunately the total volume of vial was scratched off and illegible. What is the power volume of DrugQ if 1 vial is sufficient for the daily dose with no leftovers?
Daily dose = 300mg. Since the concentration is 62.5mg/1mL, 300mg : X :: 62.5mg : 1mL. X = 1mL*300mg/62.5mg = 4.8mL, which is the total volume. Powder volume = 4.8-4.6 = 0.2mL
Doctor orders DrugS IV daily. Pharmacy technician prepares 750mL D5W/0.45S IV bags with 250mg DrugS every morning. Nurse uses the following setting for IV: 25 gtts/min, 50mL/hr, 30 gtts/mL drop set at the electronic clamp. How many grams of DrugS did this patient receive from 1500H to 0520H next day?
250mg/750mL * 50mL/hr * 14.33hours = 238.89mg = 0.239g
Doctor orders 8g DrugW continuous IV daily x 3w. DrugW is available in either 500mg in NS 300mL bag or 1000mg in NS 600mL bags. What is the gtts/min for a 10gtts/mL tubing if a chosen bag only lasts for 90 minutes?
Chosen bag lasts 90 min = 1.5hr. 24hr / 1.5hr = 16 bags. Daily dose = 8g. Each bag must be 0.5g then.
10gtts/mL * 300mL/90min = 33.33gtts/min = 33gtts/min