This pill is
Cyclobenzaprine HCl 10mg
Imprint 1: DAN
Imprint 2: 5658
Color: white
Shape: round
Cyclobenzaprine is a muscle relaxant. It works by blocking nerve impulses (or pain sensations) that are sent to your brain.
Cyclobenzaprine is used to relieve pain, tenderness, and limitation of motion caused by muscle spasms. It is used, along with rest and physical therapy, for short-term treatment (i.e., 2 to 3 weeks).
Info at
http://cyclobenzaprine.drugs.com