Pharmacology ATI Chapter 3; Dosage Calculation 100% Correct!

Types of calculation - ANSWER-Solid Oral -Liquid Oral -Injectable medication -Correct Doses by Weight -IV infusion rate Standard Conversion Factors - ANSWER1mg = 1000mcg 1g = 1000mg 1kg = 1000g 1oz = 30mL 1L = 1000mL 1tsp = 5mL 1tbsp = 3tsp 1kg = 2.2lb 1gr(grain) = 60mg 1in = 2.54cm General Rounding Guidelines; Dosage over 1.0 - ANSWERRound to the nearest tenth 0.5 or higher round Up 0.4 or lower round Down -1.45 = 1.5 -1.44 = 1.4 Rounding Dosage under 1.0 - ANSWERRound to the nearest hundreth -0.746 = 0.75 -0.743 = 0.74 Ratio and Proportion example: Solid Dosage -Nurse is preparing to give phenytion 0.2g PO every 8hr. Amount available is 100mg/capsule. How many capsules should be given? - ANSWERDesired amount (desired) = 0.2g Dose available (have) = 100mg Unit conversion needed? Yes -1g = 1000mg (1 x 1000) -0.2g x 1000mg = 200mg Quantity of the dose available (Quantity)= 100mg per 1 capsule Equation: - Have/qantity = Desired/x - 100mg/1 cap = 200mg/x cap (Cross multiply) - x = 2 capsules Desired over Have example: Solid Dosage -Nurse is preparing to give phenytion 0.2g PO every 8hr. Amount available is 100mg/capsule. How many capsules should be given? - ANSWERDesired amount (desired) = 0.2g Dose available (have) = 100mg Unit conversion needed? Yes -1g = 1000mg (1 x 1000)