To be honest the first logo doesnt really work at all, also the green on the t is too bright and not very readable. One thing that should always be looked at i alignment, both of your images and text are out of alignment, if in illustrator, just select both and center align. I like where you are going with the second design but the font doesn't work for me. Have you tried alternatives to this? Perhaps use the large x in place of the x of "x-pharm" and try a few different fonts to see what else might fit. The colours could do with some improvement, a little too saturated at the moment, try changing the green and blue to a more concentrated colour rather than washed out. If doing as I've said using the image in place of the x, try changing the font to blue, I think that would work better. Lastly if these are your only ideas you might want to try creating a few more, sometimes you can get stuck on just a few ideas and get stuck where as there might be another screaming out in your head that could go further, get sketching!