It varies with location. For example, in Europe, there are very strict laws about getting the correct number of doses in a container.
When the law came in, drug companies did studies, and found that machines which counted pills and dropped them into a bottle were too inaccurate – too many bottles had an extra pill or a missing pill.
The solution was to put the pills into individual pouches. These could be counted very reliably. This was an easy way to sell pills legally, and so became the standard method used in Europe.
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