# Chapter 11 Parenteral Dosage of Drugs by e788dz6

VIEWS: 15 PAGES: 21

• pg 1
```									Parenteral Dosage of Drugs
Chapter 11
Calculation of Drug Dosage:
Parenteral

2
Calculation of Drug Dosage:
Parenteral
• Order
– Cleocin 150 mg IM every 12 hours
• Available
– Cleocin (clindamycin phosphate) 300 mg per
2 mL

3
Calculation of Drug Dosage:
Parenteral
• Step 1. Convert
– No conversion is necessary.

4
Calculation of Drug Dosage:
Parenteral
• Step 2. Think
– You want to give less than 2 mL
1
– Actually, you want to give 150 mg, which is   2
1
of 300 mg and 2 of 2 mL, or 1 mL
– Calculate to double-check your estimate.

5
Calculation of Drug Dosage:
Parenteral
• Step 3. Calculate
300 mg 150 mg

2 mL      X
300 X  300
X  1 mL

6
Calculation of Drug Dosage:
Parenteral
• Given intramuscularly every 12 hours
• Select a 3 mL syringe
• Measure 1 mL of Cleocin 300 mg per 2 mL

7
Ratio-Proportion Method:
Parenteral with Conversion

• Order: Robinul 150 mcg IM
stat
• Supply: Robinul 0.2 mg per
mL

8
Ratio-Proportion Method:
Parenteral with Conversion
• Step 1. Convert
– Equivalent: 1 mg = 1,000 mcg
1,000 mcg      X

1 mg     0.2 mg
X  200 mcg

9
Ratio-Proportion Method:
Parenteral with Conversion
• Step 2. Think
– Give less than 1 mL but more than 0.5 mL
• Don’t be fooled into thinking 0.2 mg is less than
150 mcg
• 0.2 mg is more than 150 mcg
• 0.2 mg = 200 mcg

10
Ratio-Proportion Method:
Parenteral with Conversion
• Step 3. Calculate
200 mcg 150 mcg

1 mL        X
200 X
150
X  0.75 mL

11
Ratio-Proportion Method:
Parenteral with Conversion
• Given intramuscularly immediately
•   Select a 1 mL syringe
•   Measure 0.75 mL Robinul 0.2 mg per mL
•   You may have to change needles, as this
is an IM injection.
12
Guidelines for Syringe Selection
• Standard doses more than 1 mL
– Round to tenths and measure in a 3 mL
syringe
– 3 mL syringe is calibrated to 0.1 mL
increments
• 1.53 mL is rounded to 1.5 mL
• Drawn up in a 3 mL syringe

13
Guidelines for Syringe Selection
• Small (less than 1 mL), critical care, or
children’s doses
– Round to hundredths and measure in 1 mL
syringe
– 1mL syringe is calibrated in 0.01 increments
• 0.257 mL is rounded to 0.26 mL
• Drawn up in a 1 mL syringe

14
Guidelines for Syringe Selection
• Amounts of 0.5 –1 mL calculated in tenths
• Can be accurately measured in either a 1 mL
or 3 mL syringe

15
Insulin Label
Concentration           Manufacturer
Brand Name   Storage

Species
Type
Generic Name
Expiration Date
16
Combination Insulin Dosage

40 units    12 units
NPH     Regular
Units-100    Units -100 insulin
insulin

Total insulin dosage = 52 units   17
Preparing Combination Insulin Dosage

1. Inject       2. Inject
30 units         10 units
of air.          of air.

18
Preparing Combination Insulin Dosage

3. Withdraw     4. Withdraw
10 units        30 units
regular.        NPH for a
total of 40
units.

19
Insulin Sliding Scale
• Order
– Humulin R Regular units-100 insulin subcut
based on glucose reading at 1600

20
Insulin Sliding Scale