Résumé
Neuropharmacological effects (Spontaneous locomotor activity, forced locomotor activity and anticonvulsant activity) of invermectin were studied at 400, 800 and 1600 micrograms/kg (administered, subcutaneously). Spontaneous locomotor activity was reduced at all the dose levels but forced locomotor activity was slightly reduced at 800 and 1600 micrograms/kg. The drug did not exhibit any anticonvulsant potential at any of the dose levels studied.
Sujets)
Animaux , Anthelminthiques/pharmacologie , Anticonvulsivants/pharmacologie , Comportement animal/effets des médicaments et des substances chimiques , Système nerveux central/effets des médicaments et des substances chimiques , Relation dose-effet des médicaments , Électrochoc , Ivermectine/pharmacologie , Mâle , Souris , Activité motrice/effets des médicaments et des substances chimiques , Tonus musculaire/effets des médicaments et des substances chimiquesRésumé
Cypermethrin a widely used insecticide of Pyrethroids (type II) group, was administered in mice at two dose levels (1/10 of LD50 i.e. 2.5 mg/kg and 1/5 of LD50 i.e. 5.0 mg/kg) and pharmacodynamic interactions of insecticide were studied with centrally acting drugs viz. pentobarbital sodium, amphetamine, pentylenetetrazole, acepromazine and analgin. Cypermethrin pretreatment potentiated the actions of pentobarbital and pentylene-tetrazole as evidenced by an increase in pentobarbital induced hypnosis and duration of pentylene-tetrazole induced chemoshock seizures. Tranquilizing action of acepromazine was potentiated but there was decrease in amphetamine influenced locomotor activity at both the dose levels. Cypermethrin pretreatment, however, did not have any pharmacodynamic interaction with analgin.
Sujets)
Acépromazine/pharmacologie , Amfétamine/pharmacologie , Animaux , Agents du système nerveux central/pharmacologie , Métamizole sodique/pharmacologie , Interactions médicamenteuses , Insecticides/toxicité , Dose létale 50 , Mâle , Souris , Activité motrice/effets des médicaments et des substances chimiques , Pentobarbital/pharmacologie , Pentétrazol/pharmacologie , Pyréthrines/toxicité , Crises épileptiques/induit chimiquement , Sommeil/effets des médicaments et des substances chimiquesRésumé
The study was undertaken to evaluate immunotoxic effects of cypermethrin administered orally (in ground nut oil) to male albino rats at dose levels (mg/kg) of 0 (control), 5, 10, 20 and 40 once daily for 90 days. Cypermethrin administration produced a significant leucopenia at 40 mg/kg on day 90. A dose dependent decrease (P greater than 0.05) in delayed type hypersensitivity reaction was noticed on day 61 post treatment. Humoral response as evidenced by serum haemagglutinin and haemolysin titres did not show any definite pattern on day 90. However, a significant decrease in spleen weights and significant increase in adrenal weights was recorded in rats receiving the highest test level. Total body weights and liver weights did not show any significant change with any of the dose level studied. Results of the study reveal that low doses (5 and 10 mg/kg) did not have any adverse effect on the immuno-competence of rats.