And this has only been effective in test tubes so far!! What Lyme does in a lab is often much, much different from how it behaves in the body.
And their last statement reveals a lot of truth: "It can be considered as a new, nonantibiotic, antiborrelial compound for treating Lyme disease if the efficacy of the drug is improved by developing designer molecules. Whether Borrelia has the ability to develop resistance to desloratadine-like compounds is an important question and should be addressed in future studies."
It's something that
might be able to be developed - if the efficacy of the drug is improved by developing designer molecules - and they admit, resistance needs to be studied.
Here, you can see that this has been discussed lots on this forum, including things like the normal dose of Claritin (I use it too) is 10 mgs for 24 hours and this study was for 40 mgs, I believe(?):
goo.gl/KZlZUa