Math questions on the PTCB practice
exams
questions and answers.
1 oz = ? g - Answer 1 oz = 30 g
Calculate Quanity, in g, first
1oz / 30 g = 4 oz / X g
= 120 g
Since 1:1 ratio,
Then 120/2
=60g each for a 1:1 ratio totalling 120 g or 4 oz.
A pharmacy technician receives the following order:
Synalar crm 0.01% 30 g
Menthol 300 mg
Salicylic acid 2%
Sulfur 2%
White petrolatum q.s. ad 120 g
Sig: Apply to scalp ut dict
How much white petrolatum, in g, should be used to compound this prescription?
q.s ad means ? - Answer The abbreviation "q.s. ad," from the Latin "quantum sufficit
ad," means that enough white petrolatum should be added to the other ingredients to
total 120 g of final product.
Find how much of each other ingredient is required, in g,
30 g Synalar
+ 0.3 g Menthol (300 mg ÷ 1000 mg/g = 0.3 g)
+ 2.4 g Salicylic acid (0.02 x 120 g = 2.4 g)
+ 2.4 g Sulfur (0.02 x 120 g = 2.4 g)
35.1 g (rounds to 35 g)
Then subtract that amount from 120 g to determine how much white petrolatum is
necessary.
120 g - 35 g = 85 g white petrolatum.
If 30 g of 0.5% hydrocortisone ointment is combined with 15 g of 2.5%
hydrocortisone ointment, what is the percentage of the drug in the final product? -
Answer First, determine how many g of hydrocortisone are contained in each
component. Convert percentages to decimals by moving the decimal point 2 places
to the left.
