What issues do you need to consider when designing the finished and marketed product comprising a tablet containing a non-sedating anti-histamine?

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What issues do you need to consider when designing the finished and marketed product comprising a tablet containing a non-sedating anti-histamine?
The drug has T1/2 = 16h and the adult dose will be 2mg of active pharmaceutical ingredient, once daily.
Given the need for a liquid formulation for children (between the ages of 2 and 12), which factors need to be taken into consideration when designing that finished product?
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