title: Behavioral effects of histamine H1 antagonists: comparison with other drugs and modification by haloperidol.
abstract: The behavioral effects of several histamine H1 antagonists were compared in groups of squirrel monkeys trained to respond under fixed-interval schedules involving response-produced shock or termination of a stimulus associated with shock. Low to intermediate doses of the conventional H1 antagonists chlorpheniramine (up to 3.0 mg/kg), diphenhydramine (up to 1.0 or 3.0 mg/kg), pyrilamine (up to 3.0 mg/kg) and tripelennamine (up to 0.3 or 1.0 mg/kg) produced dose-related increases in response rate under all conditions in which they were studied; higher doses either increased responding less or decreased it. In contrast, a wide range of doses of the novel H1 antagonists AHR 11325 (1.0-30.0 mg/kg), astemizole (up to 10.0 mg/kg) and loratadine (up to 17.0 mg/kg) usually had little effect on responding, although decreases in response rate accompanied by emesis were observed after the highest doses in some monkeys. Other H1 antagonists including phenindamine (0.03-17.0 mg/kg), promethazine (0.03-5.6 mg/kg) and terfenadine (0.1-10.0 mg/kg) had different effects in individual subjects (i.e., dose-related increases in response rate in some monkeys and either little change or dose-related decreases in responding in other monkeys). The dopamine uptake inhibitors cocaine (0.01-1.0 mg/kg) and bupropion (0.1-10.0 mg/kg) had behavioral effects similar to those of chlorpheniramine, diphenhydramine, pyrilamine and tripelennamine, whereas the muscarinic antagonist atropine (0.03-1.0 mg/kg), the serotonin 5-hydroxytryptamine/5-hydroxytryptamine antagonist cyproheptadine (0.03-1.0 mg/kg), the norepinephrine uptake inhibitor desmethylimipramine (0.03-3.0 mg/kg) and the benzodiazepine diazepam (0.3-30.0 mg/kg) produced only dose-related decreases in response rate.(ABSTRACT TRUNCATED AT 250 WORDS)
mesh_terms: D000818:Animals; D016642:Bupropion; D003042:Cocaine / Q000494:pharmacology; D003216:Conditioning, Operant / Q000187:drug effects*; D003533:Cyproheptadine / Q000494:pharmacology; D003891:Desipramine / Q000494:pharmacology; D003975:Diazepam / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004597:Electroshock; D006220:Haloperidol / Q000494:pharmacology*; D006634:Histamine H1 Antagonists / Q000494:pharmacology*; D008297:Male; D011427:Propiophenones / Q000494:pharmacology; D012453:Saimiri
chemical_list: D006634:Histamine H1 Antagonists; D011427:Propiophenones; D016642:Bupropion; D003533:Cyproheptadine; D003042:Cocaine; D006220:Haloperidol; D003975:Diazepam; D003891:Desipramine