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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Anticonvulsant actions of DS 103-282. Pharmacological studies in rodents and the baboon, Papio papio.

The anticonvulsant actions of DS 103-282 [5-chloro-4-(2-imidazolin-2-yl-amino)-2,1,3- benzothiadazole , tizanidine], have been evaluated after intraperitoneal administration in DBA/2 mice (seizures induced by sound), in Swiss S mice (seizures induced by N-methyl-D,L-aspartate; NMDLA ) and following intravenous or oral administration in Papio papio (seizure responses to intermittent photic stimulation). Protection against sound-induced seizures occurred after intraperitoneal administration of DS 103-282 (0.66-3.33 mg/kg). The ED50 doses for suppression of the tonic, clonic and wild-running phases of sound-induced seizures were 0.53, 0.79 and 1.3 mg/kg respectively. This protective effect of DS 103-282 (1.5 mg/kg, i.p.) was maximal after 30 min and was maintained for 60-120 min. Seizures induced by NMDLA were not suppressed by DS 103-282 (3.3-10 mg/kg, i.p.). In the baboons, a transient protection against photomyoclonic responses was observed 1 hr after intravenous administration of DS 103-282 (2-4 mg/kg). A similar profile of action was seen after oral administration of larger doses of DS 103-282 (16-32 mg/kg). Unwanted effects of DS 103-282 included transient piloerection, slight disturbance of gait and a fall in rectal temperature in mice, and muscular hypotonia and signs of sedation in baboons. These studies demonstrate an anticonvulsant action of DS 103-282, in both rodent and primate models of epilepsy, but do not support a postsynaptic blockade in excitatory neurotransmission as the mechanism of this action.[1]


  1. Anticonvulsant actions of DS 103-282. Pharmacological studies in rodents and the baboon, Papio papio. De Sarro, G.B., Croucher, M.J., Meldrum, B.S. Neuropharmacology (1984) [Pubmed]
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