There are several factors:
– The actual chemical compound of the medication can be a factor. Our bodies get rid of some medicines faster than others. For some medications, it can be possible to make special forms that will last somewhat longer or have a “delayed release”
– How it’s delivered into the body. Some ways of giving a medication are great if you need quick effects, others are better for slower effects. For example, some implants can deliver birth control for months/years.
– What its job is. Some medications need to be continually present at a certain level to work. Others may only be needed at certain intervals.
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