1. Formulas and Compounding

2. Question 1
The hospital where you work prepares a mouthwash for patients with stomatitis (mouth sores) called “magic mouthwash” that contains the following:
Hydrocortisone 100 mg/2 mL
2 mL
Nystatin suspension
30 mL
Viscous lidocaine
50 mL
Diphenhydramine elixir 12.5 mg/5 mL
q.s. a.d. 240 mL
The pharmacist asks you to make 180 mL instead of 240 mL. By what factor will you reduce each ingredient to make the desired 180 mL?
How much diphendyramine elixir is necessary for the original formula?
How much of each ingredient will be used to make 180 mL of “magic mouthwash”?

3. Question 2 Find the minimum weighable quantity for the following:
Sensitivity rating = 4 mg, permissible error 4%
Sensitivity rating = 2 mg, acceptable error rate 5%

4. Question 3
An antacid product contains 650 mg calcium carbonate and 500 mg sorbitol in each tablet. Each bottle contains 120 tablets. How much of each ingredient is needed to make 1000 bottles?

5. Question 4
The following is an old capsule formula that a veterinarian likes to use:
Hydralazine
15 mg
Reserpine
75 mcg
Furosemide
20 mg
D.T.D capsules #30
If prescription had “M. ft” instead of “D.T.D”, how many micrograms of hydralazine would be contained in one capsule”