Drug Dose based on body weight
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 dose of a medicine for an adolescent is acceptable as either 5 mg/kg or 300 mg. Calculate the difference in these alternative doses for a 7–year–old patient weighing 43 lb
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lb equals 202.39 mg kg
Drug dosage based on body weight
- Drug doses based on weight are expressed as a specific quantity of drug per unit of patient weight, such as milligrams of drug per kilogram of body weight
- Commonly abbreviated as mg/kg.
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Master formula:
`Patients\quad dose(mg) = Patients\quad weight(kg) × ` `(Drug\quad dose(mg))/(1(kg))`
Here Dose at 5 mg/kg:
`(5\quad mg)/(1\quad kg) × 43\quad lb × (0.454\quad kg)/(1\quad lb) = 97.61 \quad mg` Drug.
Therefore difference = 300 mg - 97.61 mg = 202.39 mg Ans.