Page 43 - A Guide to Dosage Form 1

1. How many millilitres of each isopropyl alcohol (IPA) solution that you will need, if you
would want to make 120 mL of a solution with 60% IPA from 70% and 30% IPA
solution?

2. You have an injection solution of Drug A 400 mg/mL. You put 10 mL of this solution
in an empty bottle and dilute it with 5 mL of Drug B 2% injection. What is the final

concentration of Drug A and Drug B?

3. How many millilitres of water will be needed to dissolve 3 g of a powder drug which is

soluble in 2.5 parts of water?

4. How many millilitres of water will be needed to dissolve 7 g of a powder drug which is
soluble in 1.5 parts of water?

5. Powder C is soluble 1:11 in water. How much water will be needed to dissolve 0.37 g
of the powder?

6. 500 micrograms in 5 mL is equal to 1 in x. What is the value of x?

7. How much of methylene blue powder is necessary to prepare 5 L solution with a

concentration of 1 in 10 000?

8. How much potassium chloride will be required to prepare 150 mL of 1: 10 solutions?

9. An antibiotic drop was dispensed to a patient (11 months old) with a dose of 0.3 mL.

A dropper was available with the product, which supplies 20 drops per mL. How
many drops should the patient receive each time?

10. What is the concentration of betamethasone in 100 g of 1:20 dilution of
betamethasone in aqueous cream?

11. Prepare 25 g of a 1 in 5 dilutions of mometasone 1% ointment in yellow soft paraffin.
How much of mometasone 1% will be required to prepare this product?