Zanaflex (Tizanidine) is a prescription muscle relaxant that relieves muscle spasms and stiffness caused by multiple sclerosis or spinal injury. It works by inhibiting nerve signals, which reduces muscle tension. To buy Zanaflex online in the United States, you must find a licensed, reputed pharmacy to ensure safety and authenticity. To avoid side effects like sleepiness or dizziness, always get your doctor's approval before beginning Zanaflex, and make sure you're taking medication as directed.