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DOSAGE CALCULATIONS Desired What is the desired (ordered amount)?
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DOSAGE CALCULATIONS Have What do you have (amount on hand)?
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How is the dosage measured
DOSAGE CALCULATIONS Vehicle How is the dosage measured (quantity)?
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Desired over Have times Vehicle
DOSAGE CALCULATIONS D V H Desired over Have times Vehicle
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Desired over Have times Vehicle
DOSAGE CALCULATIONS The order reads Lasix 20 mg po You have Lasix 20 mg tablets How many tablets will you give? Desired over Have times Vehicle
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Desired over Have times Vehicle
DOSAGE CALCULATIONS 20 mg 1 tablet 20 mg Desired over Have times Vehicle
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The labels of Desired and Have MUST match
DOSAGE CALCULATIONS 20 mg 1 tablet 20 mg The labels of Desired and Have MUST match
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If the labels match, then they cancel each other out
DOSAGE CALCULATIONS 20 mg 1 tablet 20 mg If the labels match, then they cancel each other out
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Reduce the fraction if possible
DOSAGE CALCULATIONS 20 1 tablet 20 Reduce the fraction if possible
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DOSAGE CALCULATIONS 1 1 tablet 1 Do the multiplication
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DOSAGE CALCULATIONS 1 1 tablet = 1 tablet Calculate the Dosage
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DOSAGE CALCULATIONS Give 1 tablet Amount to Give
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Desired over Have times Vehicle
DOSAGE CALCULATIONS The order reads Lasix 30 mg po You have Lasix 20 mg tablets How many tablets will you give? Desired over Have times Vehicle
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Desired over Have times Vehicle
DOSAGE CALCULATIONS 30 mg 1 tablet 20 mg Desired over Have times Vehicle
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The labels of Desired and Have MUST match
DOSAGE CALCULATIONS 30 mg 1 tablet 20 mg The labels of Desired and Have MUST match
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If the labels match, then they cancel each other out
DOSAGE CALCULATIONS 30 mg 1 tablet 20 mg If the labels match, then they cancel each other out
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Reduce the fraction if possible
DOSAGE CALCULATIONS 30 1 tablet 20 Reduce the fraction if possible
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DOSAGE CALCULATIONS 3 1 tablet 2 Do the multiplication
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DOSAGE CALCULATIONS 1 1 1 tablet 2 Calculate the Dosage
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DOSAGE CALCULATIONS 1 Give 1 Tablets 2 Amount to Give
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Desired over Have times Vehicle
DOSAGE CALCULATIONS The order reads Dilantin Suspension 200 mg po You have Dilantin Suspension 125 mg / 5 mL How many mL will you give? Desired over Have times Vehicle
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Desired over Have times Vehicle
DOSAGE CALCULATIONS 200 mg 5 mL 125 mg Desired over Have times Vehicle
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The labels of Desired and Have MUST match
DOSAGE CALCULATIONS 200 mg 5 mL 125 mg The labels of Desired and Have MUST match
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If the labels match, then they cancel each other out
DOSAGE CALCULATIONS 200 mg 5 mL 125 mg If the labels match, then they cancel each other out
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Reduce the fraction if possible
DOSAGE CALCULATIONS 200 5 mL 125 Reduce the fraction if possible
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DOSAGE CALCULATIONS 8 5 mL 5 Do the multiplication
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DOSAGE CALCULATIONS 8 1 mL 1 Calculate the Dosage
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DOSAGE CALCULATIONS Give 8 mL Amount to Give
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Does the dosage need to be converted?
DOSAGE CALCULATIONS The order reads Morphine Sulfate gr ¼ sc You have Morphine Sulfate 10 mg / 1 mL How many mL will you give? Does the dosage need to be converted?
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Caution: The labels MUST match!
DOSAGE CALCULATIONS The order reads Morphine Sulfate gr ¼ sc You have Morphine Sulfate 10 mg / 1 mL How many mL will you give? Caution: The labels MUST match!
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CONVERSIONS Converting Between the Systems Weight 60 mg = gr i
The Metric System and the Apothecary System
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Setting Up the Proportion This is the first part of your proportion
CONVERSIONS Setting Up the Proportion Step 1: What DO you know? 60 mg = 1 gr This is the first part of your proportion 60 mg : 1 gr :: 45 mg : x gr
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Setting Up the Proportion This is the first part of your proportion
CONVERSIONS Setting Up the Proportion Step 1: What DO you know? 60 mg = 1 gr This is the first part of your proportion 60 mg : 1 gr :: 45 mg : x gr
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CONVERSIONS Setting Up the Proportion
Step 2: What do you WANT to know? x mg = gr ¼ This is the second part of your proportion 60 mg : 1 gr :: x mg : ¼ gr
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CONVERSIONS Checking the Proportion
Step 3: Are the labels in the same order? 60 mg : 1 gr :: x mg : ¼ gr mg : gr mg : gr Caution: Changing the order of the labels will yield the WRONG ANSWER
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CONVERSIONS Step 4: Solve the proportion 60 mg : 1 gr :: x mg : ¼ gr
Caution: Don’t forget to LABEL your answer
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Step 4: Solve the proportion Caution: Do you have the RIGHT label?
CONVERSIONS Step 4: Solve the proportion 60 mg : 1 gr :: x mg : ¼ gr x = ¼ 60 4 x = x = 15 mg Caution: Do you have the RIGHT label?
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DOSAGE CALCULATIONS The order reads Morphine Sulfate gr ¼ sc
You now know gr ¼ = 15 mg You can convert this order to Morphine Sulfate 15 mg sc Look back at the order
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Now use Desired over Have times Vehicle
DOSAGE CALCULATIONS The order is Morphine Sulfate 15 mg sc You have Morphine Sulfate 10 mg / 1 mL How many mL will you give? Now use Desired over Have times Vehicle
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Desired over Have times Vehicle
DOSAGE CALCULATIONS 15 mg 1 mL 10 mg Desired over Have times Vehicle
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The labels of Desired and Have MUST match
DOSAGE CALCULATIONS 15 mg 1 mL 10 mg The labels of Desired and Have MUST match
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If the labels match, then they cancel each other out
DOSAGE CALCULATIONS 15 mg 1 mL 10 mg If the labels match, then they cancel each other out
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Reduce the fraction if possible
DOSAGE CALCULATIONS 15 1 mL 10 Reduce the fraction if possible
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Remember: The metric system uses decimals
DOSAGE CALCULATIONS 3 = 1.5 2 Remember: The metric system uses decimals
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Do the multiplication and calculate the dosage
DOSAGE CALCULATIONS mL Do the multiplication and calculate the dosage
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DOSAGE CALCULATIONS Give 1.5 mL Amount to Give
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Look back to the original order
DOSAGE CALCULATIONS The order is Morphine Sulfate 15 mg sc You have Morphine Sulfate 10 mg / 1 mL You will give 1.5 mL Morphine Sulfate Look back to the original order
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You can also use the Proportion Method
DOSAGE CALCULATIONS The order is Morphine Sulfate 15 mg sc You have Morphine Sulfate 10 mg / 1 mL How many mL will you give? You can also use the Proportion Method
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DOSAGE CALCULATIONS Using the Proportion Method
Step 1: What do you Have (Label)? Morphine Sulfate 10 mg / 1 mL This is the first part of your proportion 10 mg : 1 mL :: 45 mg : x gr
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DOSAGE CALCULATIONS Using the Proportion Method
Step 2: What do you Desire (Order)? Morphine Sulfate 15 mg This is the second part of your proportion 10 mg : 1 mL :: 15 mg : x mL
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DOSAGE CALCULATIONS Using the Proportion Method
Step 3: Are the labels in the same order? 10 mg : 1 mL :: 15 mg : x mL mg : gr mg : gr Caution: Changing the order of the labels will yield the WRONG ANSWER
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DOSAGE CALCULATIONS Step 4: Solve the proportion
10 mg : 1 mL :: 15 mg : x mL 15 = 10x 15 10 = x x = 1.5 mL Caution: Don’t forget to LABEL your answer
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Step 4: Solve the proportion Caution: Do you have the RIGHT label?
DOSAGE CALCULATIONS Step 4: Solve the proportion 10 mg : 1 mL :: 15 mg : x mL 15 = 10x 15 10 = x x = 1.5 mL Caution: Do you have the RIGHT label?
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Look back to the original order
DOSAGE CALCULATIONS The order is Morphine Sulfate 15 mg sc You have Morphine Sulfate 10 mg / 1 mL You will give 1.5 mL Morphine Sulfate Look back to the original order
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Calculate this dose using the D/H * V Method
DOSAGE CALCULATIONS The order reads Dilantin Suspension 400 mg po You have Dilantin Suspension 125 mg / 5 mL How many mL will you give? Calculate this dose using the D/H * V Method
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Calculate this dose using the Proportion Method
DOSAGE CALCULATIONS The order reads Dilantin Suspension 400 mg po You have Dilantin Suspension 125 mg / 5 mL How many mL will you give? Calculate this dose using the Proportion Method
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Desired over Have times Vehicle It’s really YOUR Choice
DOSAGE CALCULATIONS Desired over Have times Vehicle – or – Set up a Proportion It’s really YOUR Choice
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