Please describe the medication: tizanidine?

Zanaflex (tizanidine) Is a drug that is used as a muscle relaxant. It is a centrally acting ?2 adrenergic agonist. It is used to treat the spasms, cramping, and tightness of muscles caused by medical problems such as multiple sclerosis, spastic diplegia, back pain, or certain other injuries to the spine or central nervous system.
Muscle relaxant. A muscle relaxant to help relax spastic muscles. Can help with pain caused by contracting muscles or spastic muscles.