Based on the findings, Cyclobenzaprine
HCl should be used with caution in subjects with mild hepatic impairment starting with the 5 mg dose and titrating slowly upward. Due to the lack of data in subjects with more severe hepatic insufficiency, the use of Cyclobenzaprine HCl in subjects with moderate to severe impairment is not recommended.
http://www.drugs.com/pro/cyclobenzaprine.