Sirdalud is a prescription medication containing 4 mg of Tizanidine per tablet, manufactured by Novartis. This package contains 30 tablets. Tizanidine is the active ingredient in this muscle relaxant medication. This is a prescription medication. The dosage and duration of treatment should be determined by a healthcare provider based on individual patient needs. Store in a cool, dry place away from direct sunlight and keep out of reach of children.