They think it's more effective and a more established way of administering the drug for now. Easier to get fast track approval as well with more reliable results in trials. A lot of the patients who would need this drug are in pretty bad shape so if I remember correctly, they were going by stats that showed the majority of the patients needing this would only be able to tolerate the suppository. I think this is only their short term solution and it will change down the road.
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