My first patient on generic APIs is now past SVR12. His method was simple – weigh on a teaspoon, swallow with water. Capsules are a convenience mechanism, as are tablets. Don’t over think it.
If you want to use filler for volume based filling of multiple capsules simultaneously use lactose from the baby section of the chemist and grind the API and lactose together in a mortar and pestle to equalise particle size and ensure a uniform mix.
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