There are many ways to delay the release rate of medication with or without a capsule. Look at [https://en.wikipedia.org/wiki/Modified-release_dosage](https://en.wikipedia.org/wiki/Modified-release_dosage) for examples.
Capsules are also used to deliver medication without the intent to slow down the release. If the medication is a liquid it is a simple way to have a single dose. If the medication irritates your mouth and throat it can be a way to stop that and the capsule just dissolves in the stoma. There are other reasons too.
So if you what to know how it works for a specific druog post its name.
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