I prefer it over Claritin. It prevents histamines from being released, instead of covering them with Anti histamines, once they are released. Its does make me a bit sleepy, and I sleep better when I took it.

I needed it for a few months when I started Copaxone, and it did a better job for me than claritin, but after a few months, and my body getting settled, I found I didnt need it anymore.

Hope that helps.