Page 41 - A guide to dosage form 1_full v3

29. Is there a need to incorporate preservative and antioxidant in an emulsion? State your

reason.

30. Why do you need to use distilled water in the preparation of an emulsion?

31. State the O:W:A ratio for fixed oil, volatile oil and mineral oil.

32. Give two examples of mineral oil.

33. Give two examples of emulgents from different classes (two for each class).

34. You are asked to prepare 200 mL emulsion with Liquid Paraffin BP 36%, Amaranth BP 0.5%
and Syrup BP 10%. How much Acacia BP would be needed to prepare this emulsion?
(Answer: 24 g)
35. How much Acacia BP will be needed to prepare 75 mL of an emulsion with 15% Cinnamin
oil? (Answer: 5.6 g)
36. Prepare a full formula to prepare Maize oil 25% v/v emulsion for a 25-year-old patient.

37. Why is hygiene important in preparing a cream?

38. The most suitable way to incorporate a course insoluble powder into a molten ointment base

will be through trituration/fusion/levigation/titration.

REFERENCES

1. Yvonne Tan Tze Fung, Saringat Baie, Peh Kok Khiang, Yusrida Darwis. Pharmacy Practice I (First
English Edition). School of Pharmaceutical Sciences USM 2007.

2. Chris Langley, Dawn Belcher. Pharmaceutical Compounding and Dispensing. Pharmaceutical
Press.
rd
3. A. J. Winfield, R. M. E Richard. Pharmaceutical Practice, 3 ed. Churchill Livingstone 2004.

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