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### Weight based dosing Simple DA method

6. Patient-based Dose 6.2) Body Weight 6.2.1) Body weight General

6.2.1.1) Drug dose based on body weight Easy 1

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The usual initial dose of Levothyroxine is 25 mcg/kg of body weight. How many milligrams should be administered to a person weighing 142 lb?

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lb equals 1.61 mg kg

Simple DA method (with drug’s weight in starting numerator).

(25 \quad mcg)/(1\quad kg) × 142 \quad lb × (0.454\quad kg)/(1\quad lb) × (1\quad mg)/(1000\quad mcg)

\quad \quad \quad \quad \quad \quad \quad \quad\quad \quad \quad \quad \quad = 1.61 \quad mg \quad Ans.

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