Practice problems

# Question
1

Hydrophilic ointment USP, has the following formula, calculate the quantities required to make 11.5 lb of hydrophilic ointment.

Methylparaben 0.25 g
Propylparaben 0.15 g
Sodium lauryl sulfate 10 g
Propylene glycol 120 g
Stearyl alcohol 250 g
White petrolatum 250 g
Purified water, to make 1000 g

2

For the following formula for 100 capsules, calculate the quantity of each ingredient needed to prepare 350 capsules.

℞: (for 100 capsules)

Ingridient
Ketoprofen 1.25 g
Riboflavin 10 g
Caffeine 3 g
Sodium bicarbonate 20 g
Silica gel 250 g

3

How much of each ingredient is needed to make two 20-g tube of the ointment?

Hydrocortisone 2.5% 3 parts
Calamine 5 parts
Petroleum 10 parts

4

Based on the formula below, how many milliliters of glycerin (specific gravity 1.263) is required to make 1500 ml of the solution?

Glycerin 50 g
Lidocaine 25 g
Benzocaine 15 g
Water, ad 250 g

Answers

The Answer to question 1 is: Methylparaben 1.31 g, Propylparaben 0.78 g, Sodium lauryl sulfate 52.21 g, Propylene glycol 626.52 g, Stearyl alcohol 1305.25 g, White petrolatum 1305.25, Purified water, to make 5221.00 g

The Answer to question 2 is: Ketoprofen 4.38 g, Riboflavin 35.00 g, Caffeine 10.50 g, Sodium bicarbonate 70.00 g, Silica gel 875.00 g

The Answer to question 3 is: Hydrocortisone 6.67 grams, Calamine 11.11 grams, Petroleum 22.22 grams

The Answer to question 4 is: 237.54 ml