Deck 11: Drug Calculations

Question 1

Order: prochlorperazine (Compazine)7.5 mg,IM (deep),q.i.d.,PRN
Available: prochlorperazine (Compazine)12.5 mg/1 mL
How many mL will be given per dose?

Answer 1

~1.6 (or 1.5)

Question 2

Order: trihexyphenidyl hydrochloride (Artane)6 mg,PO,twice daily
Available: trihexyphenidyl hydrochloride (Artane)2 mg tablets
How many tablet(s)will the patient receive on a daily basis?

Answer 2

6

Question 3

Order: 1000 mL of lactated Ringer's (LR)solution to be administered in 6 hours
Available: 1 L LR Macrodrip set labeled 10 gtt/mL
a. How many mL of LR will be infused in 1 hour?
b. How many drops per minute (gtt/min) will the patient receive?

Answer 3

a.167 (1000 mL ÷ 6 = 166.6 = 167 mL)
b.28 ([167 * 10 gtt] ÷ 60 min = 27.8 or 28 gtt/min)

Question 4

Order: cefadroxil (Duricef)0.4 g,PO,q12h
Available: cefadroxil (Duricef)250 mg/5 mL
How many mL will be given per dose?

Question 5

Order: loxapine (Loxitane)75 mg,IM,daily
Available: loxapine (Loxitane)50 mg/1 mL
How many milliliters (mL)will the patient receive?

Question 6

Order: methenamine mandelate 500 mg,PO,q.i.d.
Available: methenamine mandelate 500 mg tablet
How many tablet(s)will be given per dose?

Question 7

Order: allopurinol (Zyloprim)150 mg,PO,q.i.d.
Available: allopurinol (Zyloprim)100 mg tablet,scored
a. How many tablet(s) will be given per dose?
b. How many mg will the patient receive per day?

Question 8

Order: erythromycin 350 mg,PO,q8h.
Available: erythromycin estolate 250 mg/5 mL
How many mL will be given per dose?

Question 9

Order: Mycostatin U 500,000,PO,q.i.d.(swish and swallow)
Available: Mycostatin 100,000 units per mL
How many mL will be given?

Question 10

Order: aminocaproic acid 4 g in 250 mL D₅W to infuse in 1 hour
Set: secondary set labeled 15 gtt/min
Available: aminocaproic acid 250 mg/1 mL
a. How many mL of aminocaproic acid will be mixed in 250 mL of D₅W?
b. How many gtt/min will the patient receive?

Question 11

Order: digoxin (Lanoxin),PO,62.5 mcg,daily
Available: Lanoxin 0.125-mg tablets
How many mg will the patient receive per day?

Question 12

Order: Norvir 600 mg,PO,b.i.d.
Available: Norvir 80 mg/1 mL
a.How many milliliters (mL)will the patient receive per dose?
b.How many milligrams (mg)will the patient receive per day?

Question 13

Order: doxycycline hyclate 100 mg,PO,first day q12h; then 100 mg,PO,daily
Available: doxycycline hyclate 100 mg tablets
a. How many tablet(s) will the patient receive the first day?
b. How many tablet(s) will the patient receive daily after the first day?

Question 14

Order: cefuroxime axetil (Ceftin)200 mg,PO,b.i.d.
Available: Ceftin 250 mg/5 mL
How many mL will the patient receive per dose?

Question 15

Order: chlorpromazine (Thorazine)12.5 mg,IM (deep),STAT
Available: chlorpromazine (Thorazine)25 mg/1 mL
How many mL will be given?

Question 16

Order: midazolam (Versed)3 mg,IM,STAT
Available: Versed 5 mg/1 mL
How many mL will be given?

Question 17

Order: Augmentin 500 mg,PO,q8h
Available: amoxicillin-pot clavulanate 250-125 mg tablet
How many tablet(s)will be given per dose?

Question 18

Order: Serzone (nefazodone hydrochloride),PO: Day 1,200 mg in two divided doses; Day 8,400 mg in two divided doses.
Available: nefazodone hydrochloride 100 mg tablet
a.How many tablets will the patient receive on Day 1?
b.How many tablets will the patient receive per dose when ordered 100 mg in two divided doses?
c.How many tablets will the patient receive per dose when increased to 200 mg,b.i.d.?

Question 19

Order: trimethoprim-sulfamethoxazole (Bactrim)160/800 mg,PO,b.i.d.
Available: Bactrim 80/400-mg tablets
How many tablets will be given per dose?

Question 20

Order: amoxicillin (Amoxil)250 mg,PO,q8h
Available: 250 mg per 5 mL
a. How many mL will the patient receive per dose?
b. How many mg will the patient receive per day?
c. How many mL will the patient receive per day?

Question 21

Order: levetiracetam (Keppra),PO,20 mg/kg/day,divided b.i.d.
Available: Keppra 100 mg/mL
Patient weight: 20 kg
How many mL will the patient receive per dose?

Question 22

Order: amoxicillin (Amoxil)500 mg,PO,b.i.d.
Available: Amoxil 400 mg/5 mL
How many mL will be given per dose?