Solid state decomposition (tablets, dry syrups and dry solids) :
In solid state, when the drug is exposed to high humidity, the moisture settles (precipitates) on the solid surface. A part of the drug on the surface goes into solution and develops a saturated aqueous drug layer around the solid particle. Thus, the system behaves like a suspension, and follows a zero order. Once the entire solid is exhausted, the system exhibits first order rate.
When the decomposition occurs in small amounts, it is difficult to distinguish between zero and first order reactions. Thus, a first order reaction may appear as zero order while processing the data for deciding the order. Such reactions are referred to pseudo zero order reaction.
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