Pharmacological studies on a new dihydrothienopyridine calcium antagonist, S-312-d. 5th communication: anticonvulsant effects in mice

S-312, S-312-d, but not S-312-l, L-type calcium channel antagonists, showed anticonvulsant effects on the audiogenic tonic convulsions in DBA/2 mice; and their ED50 values were 18.4 (12.8-27.1) mg/kg, p.o. and 15.0 (10.2-23.7) mg/kg, p.o., respectively, while that of flunarizine was 34.0 (26.0-44.8) mg/kg, p.o. Although moderate anticonvulsant effects of S-312-d in higher doses were observed against the clonic convulsions induced by pentylenetetrazole (85 mg/kg, s.c.) or bemegride (40 mg/kg, s.c.), no effects were observed in convulsions induced by N-methyl-D-aspartate, picrotoxin, or electroshock in Slc:ddY mice. S-312-d may be useful in the therapy of certain types of human epilepsy.

[Monoamine content of the blood in the experimental pharmacotherapy of alcoholic intoxication]

Experiments on rabbits have shown that caffeine (10 mg/kg), ethimizol (10 mg/kg) and particularly bemegride (5 mg/kg) increase the blood adrenaline and noradrenaline content up to the level characteristic for intact animals under acute ethanol poisoning (2.5 g/kg per os). This effect has been found to be more remarkable on repeated administration. The shifts in the serotonin content are inconsistent in this case.

[Metabolic shifts during the repeated administration of analeptics in alcoholic intoxication]

It was shown in experiments on rabbits that under acute alcohol poisoning of medium degree, repeated administration of caffeine (10 mg/kg) and bemegrid in particular (5 mg/kg) promotes aerobization of the oxidative processes and mobilizes the respiratory mechanism of metabolic acidosis compensation. Under these conditions, ethimizol (10 mg/kg) stimulates the respiratory center and promotes (to a less measure) aerobization of the metabolic processes in tissues and ethanol elimination.