Sirdalud is a prescription medication containing 2 mg of Tizanidine per tablet, manufactured by Novartis. This package contains 30 tablets. Sirdalud is a muscle relaxant used to treat muscle spasms and stiffness. The active ingredient Tizanidine belongs to a class of medications called muscle relaxants. The medication comes in tablet form at a 2 mg strength. As this is a prescription medication, it should only be taken under the direction and supervision of a healthcare provider.