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Medication Calculations - University of Southern Queensland

Medication CalculationsBefore you begin to perform Medication Calculations , it is important that you reviewyour knowledge on basic maths Calculations , such as fractions, percentages, ratios anddecimals. The following examples explain the formula and the ratio method of medica -tion formula for the calculation of a Medication to be administered:Volume or Strength Required=Strength RequiredStock Strength or Stock Available Stock is the difference between ratios and proportions?Ratiois a comparison of two or more related quantities. Ratio is represented by a example 2 : 3 .Proportionis part of a whole. Proportions are represented as fractions or decimals. Forexample,12= .Note: When administering tablets orally, the stock volume is always 1, since tablets arein their solid form.

Medication Calculations Before you begin to perform medication calculations, it is important that you review your knowledge on basic maths calculations, such as fractions, percentages, ratios and decimals. The following examples explain the formula and the ratio method of medica-tion calculation.

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Transcription of Medication Calculations - University of Southern Queensland

1 Medication CalculationsBefore you begin to perform Medication Calculations , it is important that you reviewyour knowledge on basic maths Calculations , such as fractions, percentages, ratios anddecimals. The following examples explain the formula and the ratio method of medica -tion formula for the calculation of a Medication to be administered:Volume or Strength Required=Strength RequiredStock Strength or Stock Available Stock is the difference between ratios and proportions?Ratiois a comparison of two or more related quantities. Ratio is represented by a example 2 : 3 .Proportionis part of a whole. Proportions are represented as fractions or decimals. Forexample,12= .Note: When administering tablets orally, the stock volume is always 1, since tablets arein their solid form.

2 Units for the strength required and stock strength must be the 1 The doctor ordered 150 mg of Aspirin for your patient. Aspirin is available as 300 mgper tablet. How many tablets would you administer to your patient?Solution:Using the formula methodStrength required=150 in stock=300 mg per of tablets=150 mg300 mg per tablet 11=12of a tablet .The ratio methodThe steps to follow are1. Write what you know or what is available as a ratio. For example, 300 mg : 1 tab .2. Write the doctor s order and the unknown as a ratio. For example, 150 mg :xtab .Use letterxfor the Write ratios as fractions and cross multiply to solve mg : 1 tablet ,150 mg :xtablet .Write as fraction:300 mg1 tablet=150 multiply to give3001=150x300x=150.

3 Dividing both sides by 300 to solve forx 300x 300=150300x=12tablet .Example 2A patient is prescribed 240 mg of Gentamycin, and the stock strength is 80 mg per 2 the volume of Gentamicin :Using the formula methodVolume Required=240 mg80 mg 21mL=6 mL of Gentamycin .Using the ratio methodStock strength: 80 mg : 2 mL ,Doctor s order: 240 mg :xmL .Write as fraction80 mg2 mL=240 mgxmLCross multiply to give802=240x80x=480 .Dividing both sides by 80 to getx 80x 80=48080x=6 mL .Therefore, the volume of Gentamycin needed is 6 resources Brotto and Rafferty (2016) Reid-Searl, Dwyer, Moxham, and Reid-Speirs (2007) Online resources at Study Support; Arrange a consultation with a Mathematics Learning , V.

4 , & Rafferty, K. (2016).Clinical dosage Calculations for Australia and New Zealand(2nd ed.). South Melbourne, Australia: Cengage , K., Dwyer, T., Moxham, L., & Reid-Speirs, J. (2007).Nursing student s maths& medications survival guide. Frenchs Forest, Australia: Pearson.


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