Thiocolchicoside (THC) is an important active pharmaceutical ingredient (API) used as a muscle relaxant because of its anti-inflammatory and analgesic effects. The only entry for a THC-related compound present in the Cambridge Structural Database (CSD) corresponds to a THC ethanol solvate hydrate (refcode: THCLCS). The diffraction pattern recorded for the THC raw material (C27H33NO10S·xH2O) is different from the pattern calculated using the THCLCS crystallographic data contained in the CSD. The indexing of the THC raw material pattern, produced an orthorhombic unit cell with a  = 28.018(7) Å, b  = 12.519(2) Å, c  = 8.519(1) Å, and V = 2988.01 Å3. All the diffraction maxima of the powder pattern of a phase recrystallized in water (C27H33NO10S·2H2O) can be indexed in an orthorhombic cell with a  = 25.264(4) Å, b  = 13.537(3) Å, c  = 8.553(1) Å, and V = 2925.12 Å3. Thermogravimetric analysis shows that this compound is a dihydrate phase. Upon heating, a new anhydrous phase (C27H33NO10S) with a monoclinic cell and unit cell parameters: a  = 17.090(5) Å, b  = 19.485(5) Å, c  = 8.526(3) Å, β = 100.30(2)°, and V = 2793.34 Å3 is obtained.

Eleven adult patients with severe head injuries caused by blunt trauma, (Glasgow Coma Score of eight or less after resuscitation), were studied while being mechanically ventilated and sedated in the intensive care unit (ICU). In a double blind randomized cross over trial each patient received a bolus of suxamethonium (1 mg kg−1) or an equal volume of saline(0.02 mL kg−1) before planned physiotherapy. Intracranial pressure (ICP) and mean arterial pressure(MAP) were measured continuously for 10 min after each injection. There were no significant changes in intracranial pressure or cerebral perfusion pressure(CPP) following the administration of suxamethonium or saline. Suxamethonium appears to be a safe drug to use on sedated persons with severe head injuries following blunt trauma.