Bacquisil is a medication that contains the active ingredient baclofen, which is a muscle relaxant used primarily to treat muscle spasticity associated with conditions such as multiple sclerosis or spinal cord injuries. It works by acting on the central nervous system to reduce muscle tone and spasticity. Baclofen is often prescribed in oral form but can also be administered via an intrathecal pump for more severe cases. As with any medication, it may have side effects and should be used under medical supervision.