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Chapter 11. Dosage Calculation Using Ratio and Proportion. Ratios. A ratio consists of two different numbers or qualities that have a significant relationship to each other. Dosages. 50 mg = 1 tablet 50 mg = 5 mL 50 mg = 1 mL. 50 mg per tablet.

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chapter 11

Chapter 11

Dosage Calculation Using Ratio and Proportion

ratios
Ratios
  • A ratio consists of two different numbers or qualities that have a significant relationship to each other.
dosages
Dosages
  • 50 mg = 1 tablet
  • 50 mg = 5 mL
  • 50 mg = 1 mL
50 mg per tablet
50 mg per tablet
  • If you have a 50 mg tablet and the physician order says to give 100 mg
  • 50 mg 1 tablet

100 mg = x tablets

You would need to give 2 tablets

50 mg in 5 ml
50 mg in 5 mL
  • The physician order is to give 25 mg
  • The drug comes in a suspension of 50 mg / 5 mL
  • 50 mg5 mL

25 mg = x mL

You would give 2.5 mL of the suspension to equal 25 mg of the drug.

50 mg in 1 ml
50 mg in 1 mL
  • The physician order is to give 25 mg of the drug.
  • 50 mg1 mL

25 mg = x mL

You would give 0.5 mL of the drug to equal 25 mg.

1500 mcg per tablet
1500 mcg per tablet
  • The physician order states that you are to give 1.5 mg of the medication
  • How many tablets would you administer?
  • 1500 mcg = 1.5 mg
  • You would give one tablet
1500 mcg per tablet1
1500 mcg per tablet
  • The physician order states to give 0.75 mg
  • 1500 mcg = 1.5 mg
  • 1.5 mg1 tablet

0.75 mg = x tablets

You would administer ½ tablet to equal the correct dosage.

200 mg in 5 ml
200 mg in 5 mL
  • The physician orders 1 grain per year.
  • The child is 4 years old – you would need to give 4 grains
  • How may mgs in 4 grains? (60 x 4) = 240 mg
  • 200 mg5 mL

240 mg = x mL

You would give 6 ml of the medication

8 mg 1 ml
8 mg / 1 mL
  • The physician orders 10 mg of the drug.
  • 8 mg1 mL

10 mg = x mL

You would administer 1.25 mL to equal 10 mg

8 mg 1 ml1
8 mg / 1 mL
  • The physician orders 6 mg of the drug.
  • 8mg1 mL

6 mg = x mL

You would give 0.75 mL to equal 6 mg of the drug.

25 mg 1 5 ml
25 mg / 1.5 mL
  • The order is for 20 mg of a drug.
  • 25 mg1.5 mL

20 mg = x mL

You would administer 1.2 mL to equal 20 mg of the drug.

160 mg 0 8 ml
160 mg / 0.8 mL
  • The physician orders 120 mg of the drug
  • 160 mg0.8 mL

120 mg = x mL

You would give 0.6 mL of the drug to equal 120 mg.

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