We don't really know why seizures happen, because we don't really know why the brain works.
We pretty much know how seizures happen. It's like an electrical storm in the brain. And we have some ideas of what can trigger it. But the brain is incredibly complicated, so we can't be 100% sure that we know a whole lot about it.
We don't know why.
And because of that, we don't know how the medicines work. We just know that sometimes we stumble across the right combination of chemicals to keep a person from having seizures. We're not sure exactly why it stops seizures, but it does.
In some people.
Because everyone's brain is different. Everyone's. So what works for one person might not work for anyone else.
So basically, there are a bunch of medications. And it can be really difficult to find something that works... because, since everyone's brain is different, everyone can have a whole bunch of BAD effects along with the good effects.
And what my doctor is trying to do is find something that has all of the good effects and very few of the bad.