## Microsoft word - drugcalcpractice.doc

**DOSAGE CALCULATIONS: **
**ADDITIONAL PRACTICE QUESTIONS **
**DRUG CALCULATIONS **
** **

Using the following Basic Formula can help to simplify drug calculations:

**D x V = Dosage Required **

H

D = dose desired (i.e. the drug dose ordered by the physician)
H = dose on-hand (i.e. the drug dose on the label of the drug container)
V = volume (i.e. the form and amount in which the drug comes)
When answering the following questions, be sure to:
• round off to 2 decimal points for mL and mg (where appropriate)
• state the unit of measurement in each answer
Each vial contains equivalent of 1500mg Clindamycin.
Discard open solution after 24 hours at room temperature

**150mg/mL **
See enclosure for prescribing information.
CAUTION: Federal law prohibits dispensing
The physician’s order reads: Clindamycin 300mg IV q8h How many mLs are required for one dose?
Vial contains Diazepam equivalent to 10mg.

**2.5mg/mL **
Discard open solution after 8 hours at room temperature or
Read accompanying circular. EXPIRES 09/09/09
The physician’s order reads: Diazepam 10 mg IV stat How many mLs are required for one dose?
Vial contains equivalent of 1g Cefazolin.
See enclosure for prescribing information.
The physician’s order reads: Cefazolin 250 mg IV q8h
Each vial contains equivalent of 300mg Ranitidine.
Discard open solution after 24 hours at room temperature
See enclosure for prescribing information.
CAUTION: Federal law prohibits dispensing
The physician’s order reads: Ranitidine 50 mg IV over 5 min

**400,000 units/ 2mL **
Discard open solution after 8 hours at room temperature or
The physician’s order reads: Penicillin G 1,000,000 units IV q6h
Vial contains equivalent of 1g Tetracycline.

**1000mg/ mL **
See enclosure for prescribing information.
The physician’s order reads: Tetracycline 500 mg IV b.i.d.
Each vial contains equivalent of 200mg Acyclovir.
Discard open solution after 24 hours at room temperature
See enclosure for prescribing information.
CAUTION: Federal law prohibits dispensing
The physician’s order reads: Acyclovir 175 mg IV over 1 hour How many mLs are required for one dose?
Vial contains Heparin equivalent to 100,000units.

**10,000 units/mL **
Discard open solution after 8 hours at room temperature or
Usual Adult Doses: Up to 10,000 units IV
The physician’s order reads: Heparin 7500 units IV push
Vial contains equivalent of 1g Gentamycin.

**100mg/ 2mL **
See enclosure for prescribing information.
The physician’s order reads: Gentamycin 80 mg IV q8h
Vial contains Methylprednisone equivalent to 1000mg.

**500mg/mL **
Discard open solution after 8 hours at room temperature or
CAUTION: Federal law prohibits dispensing without
The physician’s order reads: Methylprednisone 175 mg IV q4h

**DRUG CALCULATIONS ANSWER KEY **

(Since you got an answer that goes to many decimal
points, this is a case where you should round off to only 2 decimal points)
1,000,000 units X 2 mL =

**5 mL **
Source: http://blogs.rrc.ca/delaney/wp-content/uploads/2-Drug-Calculations1.pdf

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