Hey Sydney...
You can find the chemical make up of both Baclofen (Lioresal) and Skelaxin (Metaxalone) on
http://www.rxlist.com
At the top you'll see...
Find a drug... just fill in the space with the one you are looking for and hit search...this site will give you everything from chemical makeup of the drugs to side effects and more.
Hope this helps...
Abbie