Podcast
Questions and Answers
What is the formula for calculating drug dosage?
What is the formula for calculating drug dosage?
Dose = Strength of Drug (mg or g) × Volume or Number of Units
How is drug dosage calculated for medications based on body weight?
How is drug dosage calculated for medications based on body weight?
Dose = Dose per kg × Body Weight (kg)
What is the formula for calculating a patient's body surface area (BSA)?
What is the formula for calculating a patient's body surface area (BSA)?
BSA (m²) = √(Height (cm) × Weight (kg)) / 3600
What is Clark's Rule used for in pediatric dosage calculations?
What is Clark's Rule used for in pediatric dosage calculations?
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How do you calculate the volume of dose for oral liquids?
How do you calculate the volume of dose for oral liquids?
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How do you calculate the flow rate for an IV infusion?
How do you calculate the flow rate for an IV infusion?
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How many milligrams are there in one gram?
How many milligrams are there in one gram?
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How many grams are there in one kilogram?
How many grams are there in one kilogram?
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How many grams are there in one pound?
How many grams are there in one pound?
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How many milliliters are there in one teaspoon?
How many milliliters are there in one teaspoon?
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How do you calculate the number of tablets needed for a given dose?
How do you calculate the number of tablets needed for a given dose?
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Study Notes
Pharmaceutical Calculations
- Basic Formula: Dose = Strength × Volume/Units
-
Dosage Based on Weight: Dose = Dose per kg × Body Weight (kg)
- Example: 5 mg/kg drug, 50 kg patient = 250 mg
-
Dosage Based on Body Surface Area (BSA): Dose = Dose per m² × BSA (m²)
- BSA Calculation (Mosteller): BSA (m²) = √(Height (cm) × Weight (kg)) / 3600
- Example: BSA 1.5 m², 100 mg/m² drug = 150 mg
-
Pediatric Dosage Calculations:
- Clark's Rule (Weight-Based): Child's Dose = (Weight (lbs) / 150) × Adult Dose
- Young's Rule (Age-Based): Child's Dose = [Age (years) / (Age + 12)] × Adult Dose
Oral Liquid Dosage
- Volume of Dose (mL) = Prescribed Dose (mg) / Concentration (mg/mL)
- Example: 125 mg/5 mL concentration, 250 mg dose = 10 mL
Intravenous (IV) Dosage
- Flow Rate (mL/hour): Flow Rate = Volume (mL) / Time (hours)
- Drop Rate (gtt/min): Drop Rate = Volume (mL) × Drop Factor (gtt/mL) / Time (minutes)
Conversion Factors
- 1 g = 1000 mg
- 1 mL = 1 cc
- 1 kg = 1000 g
- 1 pound = 454 g
- 1 teaspoon = 5 mL
- 1 tablespoon = 15 mL
Solid Dosage Forms (Tablets/Capsules)
- Number of Tablets = Total Dose (mg) / Strength per Tablet
- Example: 500 mg/tablet, 1000 mg dose = 2 tablets
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Description
Test your knowledge on pharmaceutical calculations, including dosage formulas for various patient considerations such as weight, body surface area, and age. This quiz covers essential calculations for oral, intravenous, and pediatric dosages. Brush up on these critical skills for effective medication management.
