Everyone here gave good answers, but I will also add that the cycle of medication in the market is typically that the first person to come out with a new medicine gets it out ok the market without many features. So, you have this shiny new medicine that lots of people want to start using, but maybe you need to be taking a big capsule 3 times a day. Then other drug manufacturers come alone with the same or similar medication with better features like a more precise delivery method or a pill you only have to take once a day ect. Number of pills needed per day is one of the most common improvements we see drug manufacturers make post release.
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