Thiocolchicoside 4mg/8mg is a muscle relaxant commonly used to treat muscle spasm and pain associated with conditions like acute back pain, cervical spondylosis, and other musculoskeletal disorders. It works by inhibiting the activity of muscle spindle reflexes, thus helping to reduce muscle tone and provide relief from spasms. Thiocolchicoside also has anti-inflammatory and analgesic properties. The 4mg or 8mg doses are typically administered orally, depending on the severity of the condition. Like other muscle relaxants, it may cause side effects such as drowsiness, dizziness, or gastrointestinal discomfort. It should be used cautiously, particularly in individuals with liver or kidney disorders.