Tizanidine HCL

ph (a 1% w/v aqueous solution) limit between 4.3 to 5.3, loss on drying (at 105 0 for 3 hrs) nmt 0.5 % w/w, residue on ignition nmt 0.1% w/w, assay (by titration) (on dried basis) limit: 98.0 % to 102.0 % w/w, etc.