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Oral Dosage of Drugs

Oral Dosage of Drugs. Chapter 10. Dosage Calculations Ratio and Proportion Method. Step 1. Convert Ensure measurements are in same system and units are in same size. If not, use ratio and proportion to convert. Step 2. Think Estimate what is a reasonable dose.

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Oral Dosage of Drugs

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  1. Oral Dosage of Drugs Chapter 10

  2. Dosage CalculationsRatio and Proportion Method • Step 1.Convert • Ensure measurements are in same system and units are in same size. • If not, use ratio and proportion to convert. • Step 2.Think • Estimate what is a reasonable dose.

  3. Dosage CalculationsRatio and Proportion Method • Step 3. Calculate • Calculate drug dose using a proportion. • Look for a known ratio [usually the dosage on hand] • Set up a proportion • Known ratio is equivalent to ratio for desired drug.

  4. Converting to Same SystemRatio and Proportion Method • Ordered: V-Cillin 500 mg Available: V-Cillin 0.5 g per tablet • What do you notice? • Same system • Different size units • Needs to be converted

  5. Converting to Same SystemRatio and Proportion Method • Math Tip • In most cases, it is more practical to convert to smaller unit. • Usually eliminates decimal or fraction, keeping calculation in whole numbers.

  6. Converting to Same SystemRatio and Proportion Method • Equivalent: 1g = 1,000 mg 1 g 0 . 5 g = 1, 0 0 0 m g X m g X = 1, 0 0 0 0 . 5 X = 5 0 0 m g

  7. Converting to Same SystemRatio and Proportion Method • Let’s review order • Ordered: V-Cillin 500 mg • Available: V-Cillin 0.5 g per tablet • After converting, what is ordered and available are the same amount: • 500 mg

  8. Converting to Same SystemRatio and Proportion Method • Ordered: Phenobarbital gr p.o.q. 12 hr Available: Phenobarbital 15 mg per tablet • What do you notice? • Different system • Needs to be converted

  9. Converting to the Same SystemRatio and Proportion Method • Math Tip • Convert apothecary and household measurements to their metric equivalents • Metric system is the predominant system of measurement for drugs

  10. Converting to the Same SystemRatio and Proportion Method • Equivalent: gr 1 = 60 mg g r 1 g = = 6 0 m g X m g X - 6 0 X = 6 0 m g g r = g r = 3 0 m g

  11. Converting to Same SystemRatio and Proportion Method • Let’s review order • Ordered: phenobarbital gr p.o.q. 12 hr • Available: phenobarbital 15 mg per tablet • After converting • 30 mg was ordered

  12. Converting to Same SystemRatio and Proportion Method

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