VST-102 Lecture 11 Math

A pet needs 35 mg of a solution, and the medication is available as a 100-mg/mL solution. How many milliliters will be needed?

.35mls

How many mL would be required for 274 mg from a 0.75% solution?

.75 % x 10 = 7.5mg/mL 274mg /7.5mg/mL = 36.5ml

TEASPOONS AND TABLESPOONS

1 teaspoon = 5 mL • 1 Tablespoon = 15 mL Therefore • 25 mg/t = 25 mg/5 mL = 5 mg/mL • 25 mg/T = 25 mg/15 mL = 1.67 mg/mL

How many mg were administered if 3.5 mL of a 1% solution were given?

1% = 10 mg/mL x 3.5 mL = 35 mg

A pet needs 50 mg of a tablet, and the medication is available as a 100-mg tablet. How many tablets will be needed?

1/2 tablet

How many mg were administered if 4.3 mL of a 10% solution were given?

10 % x 10 = 100mg/nl 100mg/mL x 4.3 = 430 mg

How many mL would be required for 485 mg from a 4% solution?

12.125 mL

Pounds to kgs examples 50 lbs ÷2.2 = • 33 lbs ÷2.2 =

50 lbs ÷2.2 = 22.72 kg • 33 lbs ÷2.2 = 15 kg

A pet needs 320 mg (desired dose) of a drug with a concentration of 50mg/mL (available). • How many mL would have to be administered?

6.4 mL

Drug Calculation steps

Convert lb to kg • Calculate drug dose; normally given in mg/kg • Calculate volume of drug needed per dose • Determine amount to dispense to client

DRUG CALCULATIONS equation

Dose (D) x Weight (W) = Available Concentration (C) D= Dose (mg/kg) W= Weight (lb or kg) C= Concentration of available product

PERCENTAGE SOLUTIONS

Shortcut: Unless you like doing all these calculations, you can just multiply the % by 10 and change the units to mg/m 3% solution = 3 x 10 = 30 mg/mL • 0.2% solution = 0.2 x 10 = 2 mg/mL • 1.5% solution = 1.5 x 10 = 15 mg/mL

A pet needs 114 mg (desired dose) of a drug with a concentration of 100 mg/tablet (available). How many tablets should be given?

TRICK QUESTION- underdose or underdose (Start with 1 tablet)

PERCENTAGE SOLUTIONS backwards

To determine how many mg are in the amount of mL of a solution that was administered :% Solution (in mg/mL) x mL = mg

Kgs to pounds examples • 22.72 kgs x 2.2 = • 15 kgs x 2.2 =

• 22.72 kgs x 2.2 = 49.98 lbs (50) • 15 kgs x 2.2 = 33 lbs