Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0278080 (physical dependence)
 1,658 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

1. The effects of the benzodiazepine receptor antagonists Ro 15-1788 (flumazenil) and the beta-carboline ZK 93426 were compared in dogs before and after chronic treatment with diazepam. 2. In diazepam-naive dogs, the most prominent behavioural alterations occurring during or after i.v. infusion of Ro 15-1788 up to a dose of 20 mg kg-1 were transient sedation, ataxia, and 'hot foot' behaviour, whereas behavioural alterations observed after ZK 93426 were not different from those observed after i.v. infusion of vehicle alone. This indicates that, in contrast to Ro 15-1788, ZK 93426 did not exert partial agonistic activity at benzodiazepine receptors. 3. In dogs treated 3 times daily with diazepam, 1 mg kg -1 orally, for 1 week, both benzodiazepine antagonists precipitated abstinence symptoms but the number and severity of withdrawal signs induced by Ro 15-1788 were greater than with ZK 93426. 4. In dogs treated 3 times daily with diazepam, 2 mg kg-1 orally, for 2 weeks, severe abstinence symptoms were precipitated in all animals by infusion of either antagonist but differences were found in the type of the symptoms: Ro 15-1788 induced rigid postures or rigid walking with increased muscle tone, tremor, twitches and jerks, whereas ZK 93426 did not alter motility but induced generalized myoclonic jerks and tonic-clonic seizures. A generalized tonic-clonic seizure was also observed in one dog of the trial with infusion of Ro 15-1788. 5. Plasma level determinations during chronic treatment diazepam showed marked accumulation of the major active metabolite desmethyldiazepam, whereas diazepam levels were at least 15 times lower, which might suggest that desmethyldiazepam was responsible for the development of physical dependence on diazepam.
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PMID:Physical dependence on diazepam in the dog: precipitation of different abstinence syndromes by the benzodiazepine receptor antagonists Ro 15-1788 and ZK 93426. 256 47

The effect of chronic administration of the novel anxiolytic beta-carboline derivative, abecarnil (isopropyl-6-benzyloxy-4-methoxymethyl-beta-carboline-3-carboxylate), was examined and compared with the capability of diazepam to induce physical dependence in cats. The acute administration of the benzodiazepine receptor antagonist, flumazenil (20mg/kg i.p.), to cats treated for 2 weeks with diazepam (7mg/kg i.p., three times daily), induced a severe withdrawal syndrome characterized by the appearance of severe physical signs. Within minutes all cats displayed tremors, increased muscle tone, fear response, repeated vocalization and salivation. On the contrary, in all cats treated chronically (2 weeks) with abecarnil (7mg/kg i.p. three times daily) the challenge dose of flumazenil failed to precipitate a clear abstinence syndrome. In fact, a pupillary dilatation and a mild fear response were the only signs present 15-30min after flumazenil administration. This finding indicates that abecarnil, a new potential therapeutic agent for anxiety disorders and seizures, might have advantages over classical benzodiazepines with regard to development of physical dependence.
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PMID:Failure of flumazenil to precipitate a withdrawal syndrome in cats chronically treated with the new anxioselective beta-carboline derivative abecarnil. 1122 21