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Chapter 6, Dosage calculations, teaches the techniques for calculating doses. Building on information from earlier chapters, students are taught how to calculate the amount to dispense, using all four methods of dosage calculations: ratio proportion, fraction proportion, dimensional analysis, and formula. Students will also learn to calculate estimated days supply. | Math for the Pharmacy Technician: Concepts and Calculations Chapter 6: Dosage Calculations Egler • Booth METHODS OF DOSAGE CALCULATIONS 6- Learning Objectives Identify the information on a medication order and drug label needed to calculate the desired dose. Convert the dosage ordered to the desired dose. When you have successfully completed Chapter 6, you will have mastered skills to be able to: 6- Learning Objectives (con’t) Calculate the amount to dispense of a drug. Recognize common errors that occur during dose calculations. Calculate estimated days supply. 6- Introduction This chapter will bring all of the previous information together to calculate the amount of medication to dispense to a patient. You will use: Basic math Information from the physician’s order Drug labels Method of converting quantities from one unit of measurement to another 6- Dosages and Doses To calculate medication dosages you must know: Desired Dose: The amount of the drug to be dispensed | Math for the Pharmacy Technician: Concepts and Calculations Chapter 6: Dosage Calculations Egler • Booth METHODS OF DOSAGE CALCULATIONS 6- Learning Objectives Identify the information on a medication order and drug label needed to calculate the desired dose. Convert the dosage ordered to the desired dose. When you have successfully completed Chapter 6, you will have mastered skills to be able to: 6- Learning Objectives (con’t) Calculate the amount to dispense of a drug. Recognize common errors that occur during dose calculations. Calculate estimated days supply. 6- Introduction This chapter will bring all of the previous information together to calculate the amount of medication to dispense to a patient. You will use: Basic math Information from the physician’s order Drug labels Method of converting quantities from one unit of measurement to another 6- Dosages and Doses To calculate medication dosages you must know: Desired Dose: The amount of the drug to be dispensed at a single time. Its unit of measurement must be the same as the dosage unit. 6- Dosages and Doses (con’t) Dosage ordered: The total amount of drug the physician has ordered, along with the frequency. Its unit of measurement may not be the same as that of the dosage unit. 6- Dosages and Doses (con’t) The amount of drug contained within a dosage unit of medication. Dose on hand: If a medication has 250 mg of drug per tablet, the dose on hand is 250 mg. 6- Dosages and Doses (con’t) The unit of measurement for the desired dose must be the same as the unit of measurement of the dose on hand before the amount to dispensed can be calculated. This is calculated by converting the dose ordered into the same unit of measurement as the dose on hand; once converted it becomes the desired dose. 6- Calculating the Desired Dose Before calculating the amount to be dispensed, you must first determine the desired dose. The dosage ordered is not always written in the same units that are
