1
Product formulation is often considered an art, the formulator's experience, and creativity providing "raw material" for the creation of a new product
2
Excipient : specially selected and present in definite concentrations
3
When the effects of factors on a pharmaceutical process or response are unknown, the use of screening designs to estimate factor effects may be indicated
4
Once such a region is defined, the desired response may be defined using a range of factors
5
Total quantity must be constant (100%)
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