A genious non “mechanical” example is Vyvance Which is l-dex and r-dex … r-dex gets metabolized into l-dex which then is absorbed. so without a coating it achieves an extended release. The L-dex first immediately being absorbed then as your body changes the r-dex to l-dex it gets absorbed. (L and R describe an angle on the molecule. Left or right leaning).
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