Chapter 11
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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

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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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