How can separation of chiral chemicals affect the chemical and/or pharmaceutical industries?

How can separation of chiral chemicals affect the chemical and/or pharmaceutical industries?
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Answer :

This enantiomers (left or right [R] oriented) versions of the same compound can have very different  properties; this development has been significant particularly in the pharmaceutical industry. For  example, the drug Seldane is a racemic mixture of both S and R versions of the drug’s molecules.
Through chiral separation technology, Hoechst was able to bring the drug Allegra to market in only 3  years (far less time than is usually necessary). Hoechst was able to bypass toxicity testing because  Allegra is a single chiral form of its molecule. By chiral separation, the most of the side effects of Seldane  were avoided in Allegra.
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