bah cyclobenzaprine is such a 'dirty' drug
i admit i have a osmewhat inordinate fascination with the imidazolines but , baclofen is really an up and comer in the sense that I believe we'll see new drugs in the next decade based on it, since it is getting preliminary data for about 100 diff conditions and the safety data is there.
as an fyi, clonidine has some basic safety as off label ADHD treatment, and baclofen has shown promise in autism, so these are drugs that are clearly beneficial in some peds, and based on what we know about the actions, very safe.
Here is a morsel.
http://www.ncbi.nlm.nih.gov/pubmed/17156708
edit: i mention clonidine because it has a lot more data and studies than tizanidine, and appears to be arguably very similar in action to its sibling, but again the question of relative imidazoline vs alpha selectivity gets in the way